Move Tuscany from Incubator to top level.

git-svn-id: http://svn.us.apache.org/repos/asf/tuscany@668359 13f79535-47bb-0310-9956-ffa450edef68

56 files changed, 2926 insertions, 0 deletions

diff --git a/java/sca/vtest/java-api/conversation/callback/src/main/java/org/apache/tuscany/sca/vtest/javaapi/conversation/callback/AService.java b/java/sca/vtest/java-api/conversation/callback/src/main/java/org/apache/tuscany/sca/vtest/javaapi/conversation/callback/AService.java
new file mode 100644
index 0000000000..e78736d4df
--- /dev/null
+++ b/java/sca/vtest/java-api/conversation/callback/src/main/java/org/apache/tuscany/sca/vtest/javaapi/conversation/callback/AService.java
@@ -0,0 +1,30 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ * 
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ * 
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.    
+ */
+package org.apache.tuscany.sca.vtest.javaapi.conversation.callback;
+
+/**
+ * Simple Service
+ */
+public interface AService {
+
+    public void testCallback();
+
+    public void testCallback2();
+ 
+}
diff --git a/java/sca/vtest/java-api/conversation/callback/src/main/java/org/apache/tuscany/sca/vtest/javaapi/conversation/callback/AServiceCallback.java b/java/sca/vtest/java-api/conversation/callback/src/main/java/org/apache/tuscany/sca/vtest/javaapi/conversation/callback/AServiceCallback.java
new file mode 100644
index 0000000000..0a90f9c99a
--- /dev/null
+++ b/java/sca/vtest/java-api/conversation/callback/src/main/java/org/apache/tuscany/sca/vtest/javaapi/conversation/callback/AServiceCallback.java
@@ -0,0 +1,33 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ * 
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ * 
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.    
+ */
+package org.apache.tuscany.sca.vtest.javaapi.conversation.callback;
+
+import org.osoa.sca.annotations.Conversational;
+import org.osoa.sca.annotations.Remotable;
+
+/**
+ * Simple Remotable Service
+ */
+@Remotable
+@Conversational
+public interface AServiceCallback {
+
+    public void callBack(String someState);
+    
+}
diff --git a/java/sca/vtest/java-api/conversation/callback/src/main/java/org/apache/tuscany/sca/vtest/javaapi/conversation/callback/BService.java b/java/sca/vtest/java-api/conversation/callback/src/main/java/org/apache/tuscany/sca/vtest/javaapi/conversation/callback/BService.java
new file mode 100644
index 0000000000..0e61247294
--- /dev/null
+++ b/java/sca/vtest/java-api/conversation/callback/src/main/java/org/apache/tuscany/sca/vtest/javaapi/conversation/callback/BService.java
@@ -0,0 +1,40 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ * 
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ * 
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.    
+ */
+package org.apache.tuscany.sca.vtest.javaapi.conversation.callback;
+
+import org.apache.tuscany.sca.vtest.javaapi.conversation.callback.AServiceCallback;
+import org.osoa.sca.annotations.Callback;
+import org.osoa.sca.annotations.Conversational;
+import org.osoa.sca.annotations.Remotable;
+
+/**
+ * Simple Service
+ */
+@Remotable
+@Conversational
+@Callback(AServiceCallback.class)
+public interface BService {
+
+    public void setState(String someState);
+    
+    public String getState();
+
+    public void testCallBack(String string);
+
+}
diff --git a/java/sca/vtest/java-api/conversation/callback/src/main/java/org/apache/tuscany/sca/vtest/javaapi/conversation/callback/BServiceCallback.java b/java/sca/vtest/java-api/conversation/callback/src/main/java/org/apache/tuscany/sca/vtest/javaapi/conversation/callback/BServiceCallback.java
new file mode 100644
index 0000000000..e317a6e7e0
--- /dev/null
+++ b/java/sca/vtest/java-api/conversation/callback/src/main/java/org/apache/tuscany/sca/vtest/javaapi/conversation/callback/BServiceCallback.java
@@ -0,0 +1,33 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ * 
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ * 
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.    
+ */
+package org.apache.tuscany.sca.vtest.javaapi.conversation.callback;
+
+import org.osoa.sca.annotations.Conversational;
+import org.osoa.sca.annotations.Remotable;
+
+/**
+ * Simple Remotable Service
+ */
+@Remotable
+@Conversational
+public interface BServiceCallback {
+
+    public void callBack(String someState);
+    
+}
diff --git a/java/sca/vtest/java-api/conversation/callback/src/main/java/org/apache/tuscany/sca/vtest/javaapi/conversation/callback/CService.java b/java/sca/vtest/java-api/conversation/callback/src/main/java/org/apache/tuscany/sca/vtest/javaapi/conversation/callback/CService.java
new file mode 100644
index 0000000000..6446e006bd
--- /dev/null
+++ b/java/sca/vtest/java-api/conversation/callback/src/main/java/org/apache/tuscany/sca/vtest/javaapi/conversation/callback/CService.java
@@ -0,0 +1,39 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ * 
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ * 
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.    
+ */
+package org.apache.tuscany.sca.vtest.javaapi.conversation.callback;
+
+import org.osoa.sca.annotations.Callback;
+import org.osoa.sca.annotations.Conversational;
+import org.osoa.sca.annotations.Remotable;
+
+/**
+ * Simple Service
+ */
+@Remotable
+@Conversational
+@Callback(BServiceCallback.class)
+public interface CService {
+
+    public void setState(String someState);
+
+    public String getState();
+
+    public void testCallBack(String string);
+
+}
diff --git a/java/sca/vtest/java-api/conversation/callback/src/main/java/org/apache/tuscany/sca/vtest/javaapi/conversation/callback/Utilities.java b/java/sca/vtest/java-api/conversation/callback/src/main/java/org/apache/tuscany/sca/vtest/javaapi/conversation/callback/Utilities.java
new file mode 100644
index 0000000000..15672f9ee0
--- /dev/null
+++ b/java/sca/vtest/java-api/conversation/callback/src/main/java/org/apache/tuscany/sca/vtest/javaapi/conversation/callback/Utilities.java
@@ -0,0 +1,32 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ * 
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ * 
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.    
+ */
+
+package org.apache.tuscany.sca.vtest.javaapi.conversation.callback;
+
+public class Utilities {
+    
+    public static void delayQuarterSecond() {
+        try {
+            Thread.sleep(250);// millisecs
+        } catch (InterruptedException ex) {
+            throw new Error(ex);
+        }
+    }
+
+}
diff --git a/java/sca/vtest/java-api/conversation/callback/src/main/java/org/apache/tuscany/sca/vtest/javaapi/conversation/callback/accessing/AServiceCallback.java b/java/sca/vtest/java-api/conversation/callback/src/main/java/org/apache/tuscany/sca/vtest/javaapi/conversation/callback/accessing/AServiceCallback.java
new file mode 100644
index 0000000000..400c696d82
--- /dev/null
+++ b/java/sca/vtest/java-api/conversation/callback/src/main/java/org/apache/tuscany/sca/vtest/javaapi/conversation/callback/accessing/AServiceCallback.java
@@ -0,0 +1,33 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ * 
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ * 
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.    
+ */
+package org.apache.tuscany.sca.vtest.javaapi.conversation.callback.accessing;
+
+import org.osoa.sca.annotations.Conversational;
+import org.osoa.sca.annotations.Remotable;
+
+/**
+ * Simple Remotable Service
+ */
+@Remotable
+@Conversational
+public interface AServiceCallback {
+
+    public void callBack(String someState);
+    
+}
diff --git a/java/sca/vtest/java-api/conversation/callback/src/main/java/org/apache/tuscany/sca/vtest/javaapi/conversation/callback/accessing/BService.java b/java/sca/vtest/java-api/conversation/callback/src/main/java/org/apache/tuscany/sca/vtest/javaapi/conversation/callback/accessing/BService.java
new file mode 100644
index 0000000000..33421cb4d0
--- /dev/null
+++ b/java/sca/vtest/java-api/conversation/callback/src/main/java/org/apache/tuscany/sca/vtest/javaapi/conversation/callback/accessing/BService.java
@@ -0,0 +1,41 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ * 
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ * 
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.    
+ */
+package org.apache.tuscany.sca.vtest.javaapi.conversation.callback.accessing;
+
+import org.osoa.sca.annotations.Callback;
+import org.osoa.sca.annotations.Conversational;
+import org.osoa.sca.annotations.Remotable;
+
+/**
+ * Simple Service
+ */
+@Remotable
+@Conversational
+@Callback(AServiceCallback.class)
+public interface BService {
+
+    public void setState(String someState);
+    
+    public String getState();
+
+    public void testCallBack(String string);
+
+    public void testCallBack2(String string);
+
+}
diff --git a/java/sca/vtest/java-api/conversation/callback/src/main/java/org/apache/tuscany/sca/vtest/javaapi/conversation/callback/accessing/impl/AServiceImpl.java b/java/sca/vtest/java-api/conversation/callback/src/main/java/org/apache/tuscany/sca/vtest/javaapi/conversation/callback/accessing/impl/AServiceImpl.java
new file mode 100644
index 0000000000..1b220abf69
--- /dev/null
+++ b/java/sca/vtest/java-api/conversation/callback/src/main/java/org/apache/tuscany/sca/vtest/javaapi/conversation/callback/accessing/impl/AServiceImpl.java
@@ -0,0 +1,67 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ * 
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ * 
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.    
+ */
+
+package org.apache.tuscany.sca.vtest.javaapi.conversation.callback.accessing.impl;
+
+import org.apache.tuscany.sca.vtest.javaapi.conversation.callback.AService;
+import org.apache.tuscany.sca.vtest.javaapi.conversation.callback.Utilities;
+import org.apache.tuscany.sca.vtest.javaapi.conversation.callback.accessing.AServiceCallback;
+import org.apache.tuscany.sca.vtest.javaapi.conversation.callback.accessing.BService;
+import org.junit.Assert;
+import org.osoa.sca.ServiceReference;
+import org.osoa.sca.annotations.Reference;
+import org.osoa.sca.annotations.Scope;
+import org.osoa.sca.annotations.Service;
+
+@Service(AService.class)
+@Scope("CONVERSATION")
+public class AServiceImpl implements AService, AServiceCallback {
+
+    @Reference
+    protected ServiceReference<BService> b;
+
+    private String someState;
+
+    public void callBack(String someState) {
+        System.out.println("A-callback called with this state => " + someState);
+        this.someState = someState;
+    }
+
+    public void testCallback() {
+        b.getService().testCallBack("Some string");
+        int count = 4;
+        while (someState == null && count > 0) {
+            Utilities.delayQuarterSecond();
+            count--;
+        }
+        if (someState == null)
+            Assert.fail("Callback not received by this instance");
+    }
+
+    public void testCallback2() {
+        b.getService().testCallBack2("Some string");
+        int count = 4;
+        while (someState == null && count > 0) {
+            Utilities.delayQuarterSecond();
+            count--;
+        }
+        if (someState == null)
+            Assert.fail("Callback not received by this instance");
+    }
+}
diff --git a/java/sca/vtest/java-api/conversation/callback/src/main/java/org/apache/tuscany/sca/vtest/javaapi/conversation/callback/accessing/impl/BServiceImpl.java b/java/sca/vtest/java-api/conversation/callback/src/main/java/org/apache/tuscany/sca/vtest/javaapi/conversation/callback/accessing/impl/BServiceImpl.java
new file mode 100644
index 0000000000..957957a2e4
--- /dev/null
+++ b/java/sca/vtest/java-api/conversation/callback/src/main/java/org/apache/tuscany/sca/vtest/javaapi/conversation/callback/accessing/impl/BServiceImpl.java
@@ -0,0 +1,60 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ * 
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ * 
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.    
+ */
+
+package org.apache.tuscany.sca.vtest.javaapi.conversation.callback.accessing.impl;
+
+import org.apache.tuscany.sca.vtest.javaapi.conversation.callback.accessing.AServiceCallback;
+import org.apache.tuscany.sca.vtest.javaapi.conversation.callback.accessing.BService;
+import org.osoa.sca.CallableReference;
+import org.osoa.sca.ComponentContext;
+import org.osoa.sca.annotations.Callback;
+import org.osoa.sca.annotations.Context;
+import org.osoa.sca.annotations.Scope;
+import org.osoa.sca.annotations.Service;
+
+@Service(BService.class)
+@Scope("CONVERSATION")
+public class BServiceImpl implements BService {
+
+    String someState;
+
+    @Callback
+    protected CallableReference<AServiceCallback> callback;
+    
+    @Context
+    protected ComponentContext componentContext;
+
+    public void setState(String someState) {
+        this.someState = someState;
+    }
+
+    public String getState() {
+        return someState;
+    }
+
+    public void testCallBack(String someState) {
+        callback.getService().callBack(someState);
+    }
+
+    public void testCallBack2(String someState) {
+        AServiceCallback callback = componentContext.getRequestContext().getCallback();
+        callback.callBack(someState);
+    }
+
+}
diff --git a/java/sca/vtest/java-api/conversation/callback/src/main/java/org/apache/tuscany/sca/vtest/javaapi/conversation/callback/custom/AServiceCallback.java b/java/sca/vtest/java-api/conversation/callback/src/main/java/org/apache/tuscany/sca/vtest/javaapi/conversation/callback/custom/AServiceCallback.java
new file mode 100644
index 0000000000..4ef741c1c1
--- /dev/null
+++ b/java/sca/vtest/java-api/conversation/callback/src/main/java/org/apache/tuscany/sca/vtest/javaapi/conversation/callback/custom/AServiceCallback.java
@@ -0,0 +1,33 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ * 
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ * 
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.    
+ */
+package org.apache.tuscany.sca.vtest.javaapi.conversation.callback.custom;
+
+import org.osoa.sca.annotations.Conversational;
+import org.osoa.sca.annotations.Remotable;
+
+/**
+ * Simple Remotable Service
+ */
+@Remotable
+@Conversational
+public interface AServiceCallback {
+
+    public void callBack(String someState);
+    
+}
diff --git a/java/sca/vtest/java-api/conversation/callback/src/main/java/org/apache/tuscany/sca/vtest/javaapi/conversation/callback/custom/BService.java b/java/sca/vtest/java-api/conversation/callback/src/main/java/org/apache/tuscany/sca/vtest/javaapi/conversation/callback/custom/BService.java
new file mode 100644
index 0000000000..bba4bf2611
--- /dev/null
+++ b/java/sca/vtest/java-api/conversation/callback/src/main/java/org/apache/tuscany/sca/vtest/javaapi/conversation/callback/custom/BService.java
@@ -0,0 +1,38 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ * 
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ * 
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.    
+ */
+package org.apache.tuscany.sca.vtest.javaapi.conversation.callback.custom;
+
+import org.osoa.sca.annotations.Callback;
+import org.osoa.sca.annotations.Conversational;
+import org.osoa.sca.annotations.Remotable;
+
+/**
+ * Simple Service
+ */
+@Remotable
+@Conversational
+@Callback(AServiceCallback.class)
+public interface BService {
+
+    public void setState(String someState);
+    
+    public String getState();
+
+    public void testCallBack(String string);
+}
diff --git a/java/sca/vtest/java-api/conversation/callback/src/main/java/org/apache/tuscany/sca/vtest/javaapi/conversation/callback/custom/CustomCallback.java b/java/sca/vtest/java-api/conversation/callback/src/main/java/org/apache/tuscany/sca/vtest/javaapi/conversation/callback/custom/CustomCallback.java
new file mode 100644
index 0000000000..4fb4fa53de
--- /dev/null
+++ b/java/sca/vtest/java-api/conversation/callback/src/main/java/org/apache/tuscany/sca/vtest/javaapi/conversation/callback/custom/CustomCallback.java
@@ -0,0 +1,35 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ * 
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ * 
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.    
+ */
+package org.apache.tuscany.sca.vtest.javaapi.conversation.callback.custom;
+
+import org.osoa.sca.annotations.Conversational;
+import org.osoa.sca.annotations.Remotable;
+
+/**
+ * Simple Service
+ */
+@Remotable
+@Conversational
+public interface CustomCallback {
+
+    public void someMethod();
+
+    public void callBack(String someState);
+
+}
diff --git a/java/sca/vtest/java-api/conversation/callback/src/main/java/org/apache/tuscany/sca/vtest/javaapi/conversation/callback/custom/impl/AServiceImpl.java b/java/sca/vtest/java-api/conversation/callback/src/main/java/org/apache/tuscany/sca/vtest/javaapi/conversation/callback/custom/impl/AServiceImpl.java
new file mode 100644
index 0000000000..83453397b2
--- /dev/null
+++ b/java/sca/vtest/java-api/conversation/callback/src/main/java/org/apache/tuscany/sca/vtest/javaapi/conversation/callback/custom/impl/AServiceImpl.java
@@ -0,0 +1,61 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ * 
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ * 
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.    
+ */
+
+package org.apache.tuscany.sca.vtest.javaapi.conversation.callback.custom.impl;
+
+import org.apache.tuscany.sca.vtest.javaapi.conversation.callback.AService;
+import org.apache.tuscany.sca.vtest.javaapi.conversation.callback.Utilities;
+import org.apache.tuscany.sca.vtest.javaapi.conversation.callback.custom.BService;
+import org.apache.tuscany.sca.vtest.javaapi.conversation.callback.custom.CustomCallback;
+import org.junit.Assert;
+import org.osoa.sca.ServiceReference;
+import org.osoa.sca.annotations.Reference;
+import org.osoa.sca.annotations.Scope;
+import org.osoa.sca.annotations.Service;
+
+@Service(AService.class)
+@Scope("CONVERSATION")
+public class AServiceImpl implements AService {
+
+    @Reference
+    protected ServiceReference<BService> b;
+
+    @Reference
+    protected CustomCallback customCallback;
+
+    protected static String someState;
+
+    public void testCallback() {
+        b.setCallback(customCallback);
+        b.getService().testCallBack("Some string");
+        int count = 4;
+        while (someState == null && count > 0) {
+            Utilities.delayQuarterSecond();
+            count--;
+        }
+        if (someState == null)
+            Assert.fail("Callback not received by this instance");
+    }
+
+    public void testCallback2() {
+        Assert.fail("Should never get here");
+        
+    }
+
+}
diff --git a/java/sca/vtest/java-api/conversation/callback/src/main/java/org/apache/tuscany/sca/vtest/javaapi/conversation/callback/custom/impl/BServiceImpl.java b/java/sca/vtest/java-api/conversation/callback/src/main/java/org/apache/tuscany/sca/vtest/javaapi/conversation/callback/custom/impl/BServiceImpl.java
new file mode 100644
index 0000000000..c165aa51da
--- /dev/null
+++ b/java/sca/vtest/java-api/conversation/callback/src/main/java/org/apache/tuscany/sca/vtest/javaapi/conversation/callback/custom/impl/BServiceImpl.java
@@ -0,0 +1,49 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ * 
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ * 
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.    
+ */
+
+package org.apache.tuscany.sca.vtest.javaapi.conversation.callback.custom.impl;
+
+import org.apache.tuscany.sca.vtest.javaapi.conversation.callback.custom.AServiceCallback;
+import org.apache.tuscany.sca.vtest.javaapi.conversation.callback.custom.BService;
+import org.osoa.sca.annotations.Callback;
+import org.osoa.sca.annotations.Scope;
+import org.osoa.sca.annotations.Service;
+
+@Service(BService.class)
+@Scope("CONVERSATION")
+public class BServiceImpl implements BService {
+
+    String someState;
+
+    @Callback
+    protected AServiceCallback callback;
+
+    public void setState(String someState) {
+        this.someState = someState;
+    }
+
+    public String getState() {
+        return someState;
+    }
+
+    public void testCallBack(String someState) {
+        callback.callBack(someState);
+    }
+
+}
diff --git a/java/sca/vtest/java-api/conversation/callback/src/main/java/org/apache/tuscany/sca/vtest/javaapi/conversation/callback/custom/impl/CustomCallbackImpl.java b/java/sca/vtest/java-api/conversation/callback/src/main/java/org/apache/tuscany/sca/vtest/javaapi/conversation/callback/custom/impl/CustomCallbackImpl.java
new file mode 100644
index 0000000000..c0440a2b1b
--- /dev/null
+++ b/java/sca/vtest/java-api/conversation/callback/src/main/java/org/apache/tuscany/sca/vtest/javaapi/conversation/callback/custom/impl/CustomCallbackImpl.java
@@ -0,0 +1,38 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ * 
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ * 
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.    
+ */
+
+package org.apache.tuscany.sca.vtest.javaapi.conversation.callback.custom.impl;
+
+import org.apache.tuscany.sca.vtest.javaapi.conversation.callback.custom.AServiceCallback;
+import org.apache.tuscany.sca.vtest.javaapi.conversation.callback.custom.CustomCallback;
+import org.osoa.sca.annotations.Scope;
+
+@Scope("CONVERSATION")
+public class CustomCallbackImpl implements CustomCallback, AServiceCallback {
+
+    public void someMethod() {
+        System.out.println("Custom-callback some method called");
+    }
+    
+    public void callBack(String someState) {
+        System.out.println("Custom-callback called with this state => " + someState);
+        AServiceImpl.someState = someState;
+   }
+
+}
diff --git a/java/sca/vtest/java-api/conversation/callback/src/main/java/org/apache/tuscany/sca/vtest/javaapi/conversation/callback/id/AServiceCallback.java b/java/sca/vtest/java-api/conversation/callback/src/main/java/org/apache/tuscany/sca/vtest/javaapi/conversation/callback/id/AServiceCallback.java
new file mode 100644
index 0000000000..8a237af0ad
--- /dev/null
+++ b/java/sca/vtest/java-api/conversation/callback/src/main/java/org/apache/tuscany/sca/vtest/javaapi/conversation/callback/id/AServiceCallback.java
@@ -0,0 +1,33 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ * 
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ * 
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.    
+ */
+package org.apache.tuscany.sca.vtest.javaapi.conversation.callback.id;
+
+import org.osoa.sca.annotations.Conversational;
+import org.osoa.sca.annotations.Remotable;
+
+/**
+ * Simple Remotable Service
+ */
+@Remotable
+@Conversational
+public interface AServiceCallback {
+
+    public void callBack(String someState);
+    
+}
diff --git a/java/sca/vtest/java-api/conversation/callback/src/main/java/org/apache/tuscany/sca/vtest/javaapi/conversation/callback/id/BService.java b/java/sca/vtest/java-api/conversation/callback/src/main/java/org/apache/tuscany/sca/vtest/javaapi/conversation/callback/id/BService.java
new file mode 100644
index 0000000000..9c185ddee3
--- /dev/null
+++ b/java/sca/vtest/java-api/conversation/callback/src/main/java/org/apache/tuscany/sca/vtest/javaapi/conversation/callback/id/BService.java
@@ -0,0 +1,41 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ * 
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ * 
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.    
+ */
+package org.apache.tuscany.sca.vtest.javaapi.conversation.callback.id;
+
+import org.osoa.sca.annotations.Callback;
+import org.osoa.sca.annotations.Conversational;
+import org.osoa.sca.annotations.Remotable;
+
+/**
+ * Simple Service
+ */
+@Remotable
+@Conversational
+@Callback(AServiceCallback.class)
+public interface BService {
+
+    public void setState(String someState);
+    
+    public String getState();
+
+    public void testCallBack(String string);
+
+    public void testCallBack2(String string);
+
+}
diff --git a/java/sca/vtest/java-api/conversation/callback/src/main/java/org/apache/tuscany/sca/vtest/javaapi/conversation/callback/id/impl/AServiceImpl.java b/java/sca/vtest/java-api/conversation/callback/src/main/java/org/apache/tuscany/sca/vtest/javaapi/conversation/callback/id/impl/AServiceImpl.java
new file mode 100644
index 0000000000..2e79d135f4
--- /dev/null
+++ b/java/sca/vtest/java-api/conversation/callback/src/main/java/org/apache/tuscany/sca/vtest/javaapi/conversation/callback/id/impl/AServiceImpl.java
@@ -0,0 +1,73 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ * 
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ * 
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.    
+ */
+
+package org.apache.tuscany.sca.vtest.javaapi.conversation.callback.id.impl;
+
+import org.apache.tuscany.sca.vtest.javaapi.conversation.callback.AService;
+import org.apache.tuscany.sca.vtest.javaapi.conversation.callback.Utilities;
+import org.apache.tuscany.sca.vtest.javaapi.conversation.callback.id.AServiceCallback;
+import org.apache.tuscany.sca.vtest.javaapi.conversation.callback.id.BService;
+import org.junit.Assert;
+import org.osoa.sca.RequestContext;
+import org.osoa.sca.ServiceReference;
+import org.osoa.sca.annotations.Context;
+import org.osoa.sca.annotations.Reference;
+import org.osoa.sca.annotations.Scope;
+import org.osoa.sca.annotations.Service;
+
+@Service(AService.class)
+@Scope("CONVERSATION")
+public class AServiceImpl implements AService, AServiceCallback {
+
+    @Reference
+    protected ServiceReference<BService> b;
+    
+    @Context
+    protected RequestContext requestContext;
+    
+    private String someState;
+
+    public void callBack(String someState) {
+        System.out.println("A-callback called with this state => " + someState);
+        Assert.assertNotNull(requestContext.getServiceReference().getCallbackID());
+        this.someState = someState;
+    }
+
+    public void testCallback() {
+        b.getService().testCallBack("Some string");
+        int count = 4;
+        while (someState == null && count > 0) {
+            Utilities.delayQuarterSecond();
+            count--;
+        }
+        if (someState == null)
+            Assert.fail("Callback not received by this instance");
+    }
+
+    public void testCallback2() {
+        b.getService().testCallBack2("Some string");
+        int count = 4;
+        while (someState == null && count > 0) {
+            Utilities.delayQuarterSecond();
+            count--;
+        }
+        if (someState == null)
+            Assert.fail("Callback not received by this instance");
+    }
+}
diff --git a/java/sca/vtest/java-api/conversation/callback/src/main/java/org/apache/tuscany/sca/vtest/javaapi/conversation/callback/id/impl/BServiceImpl.java b/java/sca/vtest/java-api/conversation/callback/src/main/java/org/apache/tuscany/sca/vtest/javaapi/conversation/callback/id/impl/BServiceImpl.java
new file mode 100644
index 0000000000..fb0d6b8a50
--- /dev/null
+++ b/java/sca/vtest/java-api/conversation/callback/src/main/java/org/apache/tuscany/sca/vtest/javaapi/conversation/callback/id/impl/BServiceImpl.java
@@ -0,0 +1,60 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ * 
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ * 
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.    
+ */
+
+package org.apache.tuscany.sca.vtest.javaapi.conversation.callback.id.impl;
+
+import org.apache.tuscany.sca.vtest.javaapi.conversation.callback.id.AServiceCallback;
+import org.apache.tuscany.sca.vtest.javaapi.conversation.callback.id.BService;
+import org.osoa.sca.CallableReference;
+import org.osoa.sca.ComponentContext;
+import org.osoa.sca.annotations.Callback;
+import org.osoa.sca.annotations.Context;
+import org.osoa.sca.annotations.Scope;
+import org.osoa.sca.annotations.Service;
+
+@Service(BService.class)
+@Scope("CONVERSATION")
+public class BServiceImpl implements BService {
+
+    String someState;
+
+    @Callback
+    protected CallableReference<AServiceCallback> callback;
+    
+    @Context
+    protected ComponentContext componentContext;
+
+    public void setState(String someState) {
+        this.someState = someState;
+    }
+
+    public String getState() {
+        return someState;
+    }
+
+    public void testCallBack(String someState) {
+        callback.getService().callBack(someState);
+    }
+
+    public void testCallBack2(String someState) {
+        AServiceCallback callback = componentContext.getRequestContext().getCallback();
+        callback.callBack(someState);
+    }
+
+}
diff --git a/java/sca/vtest/java-api/conversation/callback/src/main/java/org/apache/tuscany/sca/vtest/javaapi/conversation/callback/impl/AServiceImpl.java b/java/sca/vtest/java-api/conversation/callback/src/main/java/org/apache/tuscany/sca/vtest/javaapi/conversation/callback/impl/AServiceImpl.java
new file mode 100644
index 0000000000..1ace5858b2
--- /dev/null
+++ b/java/sca/vtest/java-api/conversation/callback/src/main/java/org/apache/tuscany/sca/vtest/javaapi/conversation/callback/impl/AServiceImpl.java
@@ -0,0 +1,61 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ * 
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ * 
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.    
+ */
+
+package org.apache.tuscany.sca.vtest.javaapi.conversation.callback.impl;
+
+import org.apache.tuscany.sca.vtest.javaapi.conversation.callback.AService;
+import org.apache.tuscany.sca.vtest.javaapi.conversation.callback.AServiceCallback;
+import org.apache.tuscany.sca.vtest.javaapi.conversation.callback.BService;
+import org.apache.tuscany.sca.vtest.javaapi.conversation.callback.Utilities;
+import org.junit.Assert;
+import org.osoa.sca.ServiceReference;
+import org.osoa.sca.annotations.Reference;
+import org.osoa.sca.annotations.Scope;
+import org.osoa.sca.annotations.Service;
+
+@Service(AService.class)
+@Scope("CONVERSATION")
+public class AServiceImpl implements AService, AServiceCallback {
+
+    @Reference
+    protected ServiceReference<BService> b;
+
+    private String someState;
+
+    public void callBack(String someState) {
+        System.out.println("A-callback called with this state => " + someState);
+        this.someState = someState;
+    }
+
+    public void testCallback() {
+        b.getService().testCallBack("Some string");
+        int count = 4;
+        while (someState == null && count > 0) {
+            Utilities.delayQuarterSecond();
+            count--;
+        }
+        if (someState == null)
+            Assert.fail("Callback not received by this instance");
+    }
+
+    public void testCallback2() {
+       Assert.fail("Should not be called");
+    }
+
+}
diff --git a/java/sca/vtest/java-api/conversation/callback/src/main/java/org/apache/tuscany/sca/vtest/javaapi/conversation/callback/impl/BServiceImpl.java b/java/sca/vtest/java-api/conversation/callback/src/main/java/org/apache/tuscany/sca/vtest/javaapi/conversation/callback/impl/BServiceImpl.java
new file mode 100644
index 0000000000..52d8fe5a7e
--- /dev/null
+++ b/java/sca/vtest/java-api/conversation/callback/src/main/java/org/apache/tuscany/sca/vtest/javaapi/conversation/callback/impl/BServiceImpl.java
@@ -0,0 +1,73 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ * 
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ * 
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.    
+ */
+
+package org.apache.tuscany.sca.vtest.javaapi.conversation.callback.impl;
+
+import org.apache.tuscany.sca.vtest.javaapi.conversation.callback.AServiceCallback;
+import org.apache.tuscany.sca.vtest.javaapi.conversation.callback.BService;
+import org.apache.tuscany.sca.vtest.javaapi.conversation.callback.BServiceCallback;
+import org.apache.tuscany.sca.vtest.javaapi.conversation.callback.CService;
+import org.apache.tuscany.sca.vtest.javaapi.conversation.callback.Utilities;
+import org.junit.Assert;
+import org.osoa.sca.ServiceReference;
+import org.osoa.sca.annotations.Callback;
+import org.osoa.sca.annotations.Reference;
+import org.osoa.sca.annotations.Scope;
+import org.osoa.sca.annotations.Service;
+
+@Service(BService.class)
+@Scope("CONVERSATION")
+public class BServiceImpl implements BService, BServiceCallback {
+
+    String someState;
+
+    @Callback
+    protected AServiceCallback callback;
+
+    @Reference
+    protected ServiceReference<CService> c;
+
+    public void setState(String someState) {
+        this.someState = someState;
+    }
+
+    public String getState() {
+        return someState;
+    }
+
+    public void callBack(String someState) {
+        System.out.println("B-callback called with this state => " + someState);
+        this.someState = someState;
+    }
+
+    public void testCallBack(String someState) {
+
+        c.getService().testCallBack(someState);
+        int count = 4;
+        while (this.someState == null && count > 0) {
+            Utilities.delayQuarterSecond();
+            count--;
+        }
+        if (this.someState == null)
+            Assert.fail("Callback not received by this instance");
+
+        callback.callBack(someState);
+    }
+
+}
diff --git a/java/sca/vtest/java-api/conversation/callback/src/main/java/org/apache/tuscany/sca/vtest/javaapi/conversation/callback/impl/CServiceImpl.java b/java/sca/vtest/java-api/conversation/callback/src/main/java/org/apache/tuscany/sca/vtest/javaapi/conversation/callback/impl/CServiceImpl.java
new file mode 100644
index 0000000000..eea769b2fb
--- /dev/null
+++ b/java/sca/vtest/java-api/conversation/callback/src/main/java/org/apache/tuscany/sca/vtest/javaapi/conversation/callback/impl/CServiceImpl.java
@@ -0,0 +1,49 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ * 
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ * 
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.    
+ */
+
+package org.apache.tuscany.sca.vtest.javaapi.conversation.callback.impl;
+
+import org.apache.tuscany.sca.vtest.javaapi.conversation.callback.BServiceCallback;
+import org.apache.tuscany.sca.vtest.javaapi.conversation.callback.CService;
+import org.osoa.sca.annotations.Callback;
+import org.osoa.sca.annotations.Scope;
+import org.osoa.sca.annotations.Service;
+
+@Service(CService.class)
+@Scope("CONVERSATION")
+public class CServiceImpl implements CService {
+
+    String someState;
+
+    @Callback
+    protected BServiceCallback callback;
+
+    public void setState(String someState) {
+        this.someState = someState;
+    }
+
+    public String getState() {
+        return someState;
+    }
+
+    public void testCallBack(String someState) {
+        callback.callBack(someState);
+    }
+
+}
diff --git a/java/sca/vtest/java-api/conversation/callback/src/main/java/org/apache/tuscany/sca/vtest/javaapi/conversation/callback/local/AServiceCallback.java b/java/sca/vtest/java-api/conversation/callback/src/main/java/org/apache/tuscany/sca/vtest/javaapi/conversation/callback/local/AServiceCallback.java
new file mode 100644
index 0000000000..1caa467348
--- /dev/null
+++ b/java/sca/vtest/java-api/conversation/callback/src/main/java/org/apache/tuscany/sca/vtest/javaapi/conversation/callback/local/AServiceCallback.java
@@ -0,0 +1,31 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ * 
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ * 
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.    
+ */
+package org.apache.tuscany.sca.vtest.javaapi.conversation.callback.local;
+
+import org.osoa.sca.annotations.Conversational;
+
+/**
+ *
+ */
+@Conversational
+public interface AServiceCallback {
+
+    public void callBack(String someState);
+    
+}
diff --git a/java/sca/vtest/java-api/conversation/callback/src/main/java/org/apache/tuscany/sca/vtest/javaapi/conversation/callback/local/BService.java b/java/sca/vtest/java-api/conversation/callback/src/main/java/org/apache/tuscany/sca/vtest/javaapi/conversation/callback/local/BService.java
new file mode 100644
index 0000000000..a7f471aa26
--- /dev/null
+++ b/java/sca/vtest/java-api/conversation/callback/src/main/java/org/apache/tuscany/sca/vtest/javaapi/conversation/callback/local/BService.java
@@ -0,0 +1,37 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ * 
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ * 
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.    
+ */
+package org.apache.tuscany.sca.vtest.javaapi.conversation.callback.local;
+
+import org.osoa.sca.annotations.Callback;
+import org.osoa.sca.annotations.Conversational;
+
+/**
+ * Simple Local Service
+ */
+@Conversational
+@Callback(AServiceCallback.class)
+public interface BService {
+
+    public void setState(String someState);
+    
+    public String getState();
+
+    public void testCallBack(String string);
+
+}
diff --git a/java/sca/vtest/java-api/conversation/callback/src/main/java/org/apache/tuscany/sca/vtest/javaapi/conversation/callback/local/BServiceCallback.java b/java/sca/vtest/java-api/conversation/callback/src/main/java/org/apache/tuscany/sca/vtest/javaapi/conversation/callback/local/BServiceCallback.java
new file mode 100644
index 0000000000..4aeeca6dc3
--- /dev/null
+++ b/java/sca/vtest/java-api/conversation/callback/src/main/java/org/apache/tuscany/sca/vtest/javaapi/conversation/callback/local/BServiceCallback.java
@@ -0,0 +1,31 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ * 
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ * 
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.    
+ */
+package org.apache.tuscany.sca.vtest.javaapi.conversation.callback.local;
+
+import org.osoa.sca.annotations.Conversational;
+
+/**
+ * Simple Service
+ */
+@Conversational
+public interface BServiceCallback {
+
+    public void callBack(String someState);
+    
+}
diff --git a/java/sca/vtest/java-api/conversation/callback/src/main/java/org/apache/tuscany/sca/vtest/javaapi/conversation/callback/local/CService.java b/java/sca/vtest/java-api/conversation/callback/src/main/java/org/apache/tuscany/sca/vtest/javaapi/conversation/callback/local/CService.java
new file mode 100644
index 0000000000..014f1edd33
--- /dev/null
+++ b/java/sca/vtest/java-api/conversation/callback/src/main/java/org/apache/tuscany/sca/vtest/javaapi/conversation/callback/local/CService.java
@@ -0,0 +1,37 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ * 
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ * 
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.    
+ */
+package org.apache.tuscany.sca.vtest.javaapi.conversation.callback.local;
+
+import org.osoa.sca.annotations.Callback;
+import org.osoa.sca.annotations.Conversational;
+
+/**
+ * Simple Service
+ */
+@Conversational
+@Callback(BServiceCallback.class)
+public interface CService {
+
+    public void setState(String someState);
+
+    public String getState();
+
+    public void testCallBack(String string);
+
+}
diff --git a/java/sca/vtest/java-api/conversation/callback/src/main/java/org/apache/tuscany/sca/vtest/javaapi/conversation/callback/local/impl/AServiceImpl.java b/java/sca/vtest/java-api/conversation/callback/src/main/java/org/apache/tuscany/sca/vtest/javaapi/conversation/callback/local/impl/AServiceImpl.java
new file mode 100644
index 0000000000..4e6dce6fb9
--- /dev/null
+++ b/java/sca/vtest/java-api/conversation/callback/src/main/java/org/apache/tuscany/sca/vtest/javaapi/conversation/callback/local/impl/AServiceImpl.java
@@ -0,0 +1,61 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ * 
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ * 
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.    
+ */
+
+package org.apache.tuscany.sca.vtest.javaapi.conversation.callback.local.impl;
+
+import org.apache.tuscany.sca.vtest.javaapi.conversation.callback.AService;
+import org.apache.tuscany.sca.vtest.javaapi.conversation.callback.Utilities;
+import org.apache.tuscany.sca.vtest.javaapi.conversation.callback.local.AServiceCallback;
+import org.apache.tuscany.sca.vtest.javaapi.conversation.callback.local.BService;
+import org.junit.Assert;
+import org.osoa.sca.ServiceReference;
+import org.osoa.sca.annotations.Reference;
+import org.osoa.sca.annotations.Scope;
+import org.osoa.sca.annotations.Service;
+
+@Service(AService.class)
+@Scope("CONVERSATION")
+public class AServiceImpl implements AService, AServiceCallback {
+
+    @Reference
+    protected ServiceReference<BService> b;
+
+    private String someState;
+
+    public void callBack(String someState) {
+        System.out.println("A-callback called with this state => " + someState);
+        this.someState = someState;
+    }
+
+    public void testCallback() {
+        b.getService().testCallBack("Some local string");
+        int count = 4;
+        while (someState == null && count > 0) {
+            Utilities.delayQuarterSecond();
+            count--;
+        }
+        if (someState == null)
+            Assert.fail("Callback not received by this instance");
+    }
+    
+    public void testCallback2() {
+        Assert.fail("Not implemented");
+     }
+
+}
diff --git a/java/sca/vtest/java-api/conversation/callback/src/main/java/org/apache/tuscany/sca/vtest/javaapi/conversation/callback/local/impl/BServiceImpl.java b/java/sca/vtest/java-api/conversation/callback/src/main/java/org/apache/tuscany/sca/vtest/javaapi/conversation/callback/local/impl/BServiceImpl.java
new file mode 100644
index 0000000000..2f560fe87b
--- /dev/null
+++ b/java/sca/vtest/java-api/conversation/callback/src/main/java/org/apache/tuscany/sca/vtest/javaapi/conversation/callback/local/impl/BServiceImpl.java
@@ -0,0 +1,73 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ * 
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ * 
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.    
+ */
+
+package org.apache.tuscany.sca.vtest.javaapi.conversation.callback.local.impl;
+
+import org.apache.tuscany.sca.vtest.javaapi.conversation.callback.Utilities;
+import org.apache.tuscany.sca.vtest.javaapi.conversation.callback.local.AServiceCallback;
+import org.apache.tuscany.sca.vtest.javaapi.conversation.callback.local.BService;
+import org.apache.tuscany.sca.vtest.javaapi.conversation.callback.local.BServiceCallback;
+import org.apache.tuscany.sca.vtest.javaapi.conversation.callback.local.CService;
+import org.junit.Assert;
+import org.osoa.sca.ServiceReference;
+import org.osoa.sca.annotations.Callback;
+import org.osoa.sca.annotations.Reference;
+import org.osoa.sca.annotations.Scope;
+import org.osoa.sca.annotations.Service;
+
+@Service(BService.class)
+@Scope("CONVERSATION")
+public class BServiceImpl implements BService, BServiceCallback {
+
+    String someState;
+
+    @Callback
+    protected AServiceCallback callback;
+
+    @Reference
+    protected ServiceReference<CService> c;
+
+    public void setState(String someState) {
+        this.someState = someState;
+    }
+
+    public String getState() {
+        return someState;
+    }
+
+    public void callBack(String someState) {
+        System.out.println("B-callback called with this state => " + someState);
+        this.someState = someState;
+    }
+
+    public void testCallBack(String someState) {
+
+        c.getService().testCallBack(someState);
+        int count = 4;
+        while (this.someState == null && count > 0) {
+            Utilities.delayQuarterSecond();
+            count--;
+        }
+        if (this.someState == null)
+            Assert.fail("Callback not received by this instance");
+
+        callback.callBack(someState);
+    }
+
+}
diff --git a/java/sca/vtest/java-api/conversation/callback/src/main/java/org/apache/tuscany/sca/vtest/javaapi/conversation/callback/local/impl/CServiceImpl.java b/java/sca/vtest/java-api/conversation/callback/src/main/java/org/apache/tuscany/sca/vtest/javaapi/conversation/callback/local/impl/CServiceImpl.java
new file mode 100644
index 0000000000..23e0d0e70b
--- /dev/null
+++ b/java/sca/vtest/java-api/conversation/callback/src/main/java/org/apache/tuscany/sca/vtest/javaapi/conversation/callback/local/impl/CServiceImpl.java
@@ -0,0 +1,49 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ * 
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ * 
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.    
+ */
+
+package org.apache.tuscany.sca.vtest.javaapi.conversation.callback.local.impl;
+
+import org.apache.tuscany.sca.vtest.javaapi.conversation.callback.local.BServiceCallback;
+import org.apache.tuscany.sca.vtest.javaapi.conversation.callback.local.CService;
+import org.osoa.sca.annotations.Callback;
+import org.osoa.sca.annotations.Scope;
+import org.osoa.sca.annotations.Service;
+
+@Service(CService.class)
+@Scope("CONVERSATION")
+public class CServiceImpl implements CService {
+
+    String someState;
+
+    @Callback
+    protected BServiceCallback callback;
+
+    public void setState(String someState) {
+        this.someState = someState;
+    }
+
+    public String getState() {
+        return someState;
+    }
+
+    public void testCallBack(String someState) {
+        callback.callBack(someState);
+    }
+
+}
diff --git a/java/sca/vtest/java-api/conversation/callback/src/main/java/org/apache/tuscany/sca/vtest/javaapi/conversation/callback/mixed/CService.java b/java/sca/vtest/java-api/conversation/callback/src/main/java/org/apache/tuscany/sca/vtest/javaapi/conversation/callback/mixed/CService.java
new file mode 100644
index 0000000000..705e101a01
--- /dev/null
+++ b/java/sca/vtest/java-api/conversation/callback/src/main/java/org/apache/tuscany/sca/vtest/javaapi/conversation/callback/mixed/CService.java
@@ -0,0 +1,38 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ * 
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ * 
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.    
+ */
+package org.apache.tuscany.sca.vtest.javaapi.conversation.callback.mixed;
+
+import org.apache.tuscany.sca.vtest.javaapi.conversation.callback.BServiceCallback;
+import org.osoa.sca.annotations.Callback;
+import org.osoa.sca.annotations.Conversational;
+
+/**
+ * Simple Service
+ */
+@Conversational
+@Callback(BServiceCallback.class)
+public interface CService {
+
+    public void setState(String someState);
+
+    public String getState();
+
+    public void testCallBack(String string);
+
+}
diff --git a/java/sca/vtest/java-api/conversation/callback/src/main/java/org/apache/tuscany/sca/vtest/javaapi/conversation/callback/mixed/impl/BServiceImpl.java b/java/sca/vtest/java-api/conversation/callback/src/main/java/org/apache/tuscany/sca/vtest/javaapi/conversation/callback/mixed/impl/BServiceImpl.java
new file mode 100644
index 0000000000..c03b1aedc4
--- /dev/null
+++ b/java/sca/vtest/java-api/conversation/callback/src/main/java/org/apache/tuscany/sca/vtest/javaapi/conversation/callback/mixed/impl/BServiceImpl.java
@@ -0,0 +1,73 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ * 
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ * 
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.    
+ */
+
+package org.apache.tuscany.sca.vtest.javaapi.conversation.callback.mixed.impl;
+
+import org.apache.tuscany.sca.vtest.javaapi.conversation.callback.AServiceCallback;
+import org.apache.tuscany.sca.vtest.javaapi.conversation.callback.BService;
+import org.apache.tuscany.sca.vtest.javaapi.conversation.callback.BServiceCallback;
+import org.apache.tuscany.sca.vtest.javaapi.conversation.callback.mixed.CService;
+import org.apache.tuscany.sca.vtest.javaapi.conversation.callback.Utilities;
+import org.junit.Assert;
+import org.osoa.sca.ServiceReference;
+import org.osoa.sca.annotations.Callback;
+import org.osoa.sca.annotations.Reference;
+import org.osoa.sca.annotations.Scope;
+import org.osoa.sca.annotations.Service;
+
+@Service(BService.class)
+@Scope("CONVERSATION")
+public class BServiceImpl implements BService, BServiceCallback {
+
+    String someState;
+
+    @Callback
+    protected AServiceCallback callback;
+
+    @Reference
+    protected ServiceReference<CService> c;
+
+    public void setState(String someState) {
+        this.someState = someState;
+    }
+
+    public String getState() {
+        return someState;
+    }
+
+    public void callBack(String someState) {
+        System.out.println("B-callback called with this state => " + someState);
+        this.someState = someState;
+    }
+
+    public void testCallBack(String someState) {
+
+        c.getService().testCallBack(someState);
+        int count = 4;
+        while (this.someState == null && count > 0) {
+            Utilities.delayQuarterSecond();
+            count--;
+        }
+        if (this.someState == null)
+            Assert.fail("Callback not received by this instance");
+
+        callback.callBack(someState);
+    }
+
+}
diff --git a/java/sca/vtest/java-api/conversation/callback/src/main/java/org/apache/tuscany/sca/vtest/javaapi/conversation/callback/mixed/impl/CServiceImpl.java b/java/sca/vtest/java-api/conversation/callback/src/main/java/org/apache/tuscany/sca/vtest/javaapi/conversation/callback/mixed/impl/CServiceImpl.java
new file mode 100644
index 0000000000..8e068c8be4
--- /dev/null
+++ b/java/sca/vtest/java-api/conversation/callback/src/main/java/org/apache/tuscany/sca/vtest/javaapi/conversation/callback/mixed/impl/CServiceImpl.java
@@ -0,0 +1,49 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ * 
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ * 
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.    
+ */
+
+package org.apache.tuscany.sca.vtest.javaapi.conversation.callback.mixed.impl;
+
+import org.apache.tuscany.sca.vtest.javaapi.conversation.callback.BServiceCallback;
+import org.apache.tuscany.sca.vtest.javaapi.conversation.callback.mixed.CService;
+import org.osoa.sca.annotations.Callback;
+import org.osoa.sca.annotations.Scope;
+import org.osoa.sca.annotations.Service;
+
+@Service(CService.class)
+@Scope("CONVERSATION")
+public class CServiceImpl implements CService {
+
+    String someState;
+
+    @Callback
+    protected BServiceCallback callback;
+
+    public void setState(String someState) {
+        this.someState = someState;
+    }
+
+    public String getState() {
+        return someState;
+    }
+
+    public void testCallBack(String someState) {
+        callback.callBack(someState);
+    }
+
+}
diff --git a/java/sca/vtest/java-api/conversation/callback/src/main/java/org/apache/tuscany/sca/vtest/javaapi/conversation/callback/multi/AServiceCallback.java b/java/sca/vtest/java-api/conversation/callback/src/main/java/org/apache/tuscany/sca/vtest/javaapi/conversation/callback/multi/AServiceCallback.java
new file mode 100644
index 0000000000..16b2932afc
--- /dev/null
+++ b/java/sca/vtest/java-api/conversation/callback/src/main/java/org/apache/tuscany/sca/vtest/javaapi/conversation/callback/multi/AServiceCallback.java
@@ -0,0 +1,33 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ * 
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ * 
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.    
+ */
+package org.apache.tuscany.sca.vtest.javaapi.conversation.callback.multi;
+
+import org.osoa.sca.annotations.Conversational;
+import org.osoa.sca.annotations.Remotable;
+
+/**
+ * Simple Remotable Service
+ */
+@Remotable
+@Conversational
+public interface AServiceCallback {
+
+    public void callBack(String someState);
+    
+}
diff --git a/java/sca/vtest/java-api/conversation/callback/src/main/java/org/apache/tuscany/sca/vtest/javaapi/conversation/callback/multi/AServiceCallback2.java b/java/sca/vtest/java-api/conversation/callback/src/main/java/org/apache/tuscany/sca/vtest/javaapi/conversation/callback/multi/AServiceCallback2.java
new file mode 100644
index 0000000000..56b7006581
--- /dev/null
+++ b/java/sca/vtest/java-api/conversation/callback/src/main/java/org/apache/tuscany/sca/vtest/javaapi/conversation/callback/multi/AServiceCallback2.java
@@ -0,0 +1,33 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ * 
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ * 
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.    
+ */
+package org.apache.tuscany.sca.vtest.javaapi.conversation.callback.multi;
+
+import org.osoa.sca.annotations.Conversational;
+import org.osoa.sca.annotations.Remotable;
+
+/**
+ * Simple Remotable Service
+ */
+@Remotable
+@Conversational
+public interface AServiceCallback2 {
+
+    public void callBack2(String someState);
+    
+}
diff --git a/java/sca/vtest/java-api/conversation/callback/src/main/java/org/apache/tuscany/sca/vtest/javaapi/conversation/callback/multi/BService.java b/java/sca/vtest/java-api/conversation/callback/src/main/java/org/apache/tuscany/sca/vtest/javaapi/conversation/callback/multi/BService.java
new file mode 100644
index 0000000000..580cf5a612
--- /dev/null
+++ b/java/sca/vtest/java-api/conversation/callback/src/main/java/org/apache/tuscany/sca/vtest/javaapi/conversation/callback/multi/BService.java
@@ -0,0 +1,39 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ * 
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ * 
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.    
+ */
+package org.apache.tuscany.sca.vtest.javaapi.conversation.callback.multi;
+
+import org.osoa.sca.annotations.Callback;
+import org.osoa.sca.annotations.Conversational;
+import org.osoa.sca.annotations.Remotable;
+
+/**
+ * Simple Service
+ */
+@Remotable
+@Conversational
+@Callback(AServiceCallback.class)
+public interface BService {
+
+    public void setState(String someState);
+    
+    public String getState();
+
+    public void testCallBack(String string);
+
+}
diff --git a/java/sca/vtest/java-api/conversation/callback/src/main/java/org/apache/tuscany/sca/vtest/javaapi/conversation/callback/multi/BService2.java b/java/sca/vtest/java-api/conversation/callback/src/main/java/org/apache/tuscany/sca/vtest/javaapi/conversation/callback/multi/BService2.java
new file mode 100644
index 0000000000..144492984a
--- /dev/null
+++ b/java/sca/vtest/java-api/conversation/callback/src/main/java/org/apache/tuscany/sca/vtest/javaapi/conversation/callback/multi/BService2.java
@@ -0,0 +1,39 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ * 
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ * 
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.    
+ */
+package org.apache.tuscany.sca.vtest.javaapi.conversation.callback.multi;
+
+import org.osoa.sca.annotations.Callback;
+import org.osoa.sca.annotations.Conversational;
+import org.osoa.sca.annotations.Remotable;
+
+/**
+ * Simple Service
+ */
+@Remotable
+@Conversational
+@Callback(AServiceCallback2.class)
+public interface BService2 {
+
+    public void setState(String someState);
+    
+    public String getState();
+
+    public void testCallBack2(String string);
+
+}
diff --git a/java/sca/vtest/java-api/conversation/callback/src/main/java/org/apache/tuscany/sca/vtest/javaapi/conversation/callback/multi/impl/AServiceImpl.java b/java/sca/vtest/java-api/conversation/callback/src/main/java/org/apache/tuscany/sca/vtest/javaapi/conversation/callback/multi/impl/AServiceImpl.java
new file mode 100644
index 0000000000..ce7214dba1
--- /dev/null
+++ b/java/sca/vtest/java-api/conversation/callback/src/main/java/org/apache/tuscany/sca/vtest/javaapi/conversation/callback/multi/impl/AServiceImpl.java
@@ -0,0 +1,79 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ * 
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ * 
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.    
+ */
+
+package org.apache.tuscany.sca.vtest.javaapi.conversation.callback.multi.impl;
+
+import org.apache.tuscany.sca.vtest.javaapi.conversation.callback.Utilities;
+import org.apache.tuscany.sca.vtest.javaapi.conversation.callback.AService;
+import org.apache.tuscany.sca.vtest.javaapi.conversation.callback.multi.AServiceCallback;
+import org.apache.tuscany.sca.vtest.javaapi.conversation.callback.multi.AServiceCallback2;
+import org.apache.tuscany.sca.vtest.javaapi.conversation.callback.multi.BService;
+import org.apache.tuscany.sca.vtest.javaapi.conversation.callback.multi.BService2;
+import org.junit.Assert;
+import org.osoa.sca.ServiceReference;
+import org.osoa.sca.annotations.Reference;
+import org.osoa.sca.annotations.Scope;
+import org.osoa.sca.annotations.Service;
+
+@Service(AService.class)
+@Scope("CONVERSATION")
+public class AServiceImpl implements AService, AServiceCallback , AServiceCallback2 {
+
+    @Reference
+    protected ServiceReference<BService> b;
+    
+    @Reference
+    protected ServiceReference<BService2> b2;
+
+
+    private String someState;
+    private String someState2;
+
+    public void callBack(String someState) {
+        System.out.println("A-callback called with this state => " + someState);
+        this.someState = someState;
+    }
+
+    public void callBack2(String someState) {
+        System.out.println("A-callback2 called with this state => " + someState);
+        this.someState2 = someState;    
+    }
+    
+    public void testCallback() {
+        b.getService().testCallBack("Some string");
+        int count = 4;
+        while (someState == null && count > 0) {
+            Utilities.delayQuarterSecond();
+            count--;
+        }
+        if (someState == null)
+            Assert.fail("Callback not received by this instance");
+    }
+
+    public void testCallback2() {
+        b2.getService().testCallBack2("Some string");
+        int count = 4;
+        while (someState2 == null && count > 0) {
+            Utilities.delayQuarterSecond();
+            count--;
+        }
+        if (someState2 == null)
+            Assert.fail("Callback not received by this instance");
+    }
+}
diff --git a/java/sca/vtest/java-api/conversation/callback/src/main/java/org/apache/tuscany/sca/vtest/javaapi/conversation/callback/multi/impl/BServiceImpl.java b/java/sca/vtest/java-api/conversation/callback/src/main/java/org/apache/tuscany/sca/vtest/javaapi/conversation/callback/multi/impl/BServiceImpl.java
new file mode 100644
index 0000000000..b61a15cbee
--- /dev/null
+++ b/java/sca/vtest/java-api/conversation/callback/src/main/java/org/apache/tuscany/sca/vtest/javaapi/conversation/callback/multi/impl/BServiceImpl.java
@@ -0,0 +1,64 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ * 
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ * 
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.    
+ */
+
+package org.apache.tuscany.sca.vtest.javaapi.conversation.callback.multi.impl;
+
+import org.apache.tuscany.sca.vtest.javaapi.conversation.callback.multi.AServiceCallback;
+import org.apache.tuscany.sca.vtest.javaapi.conversation.callback.multi.AServiceCallback2;
+import org.apache.tuscany.sca.vtest.javaapi.conversation.callback.multi.BService;
+import org.apache.tuscany.sca.vtest.javaapi.conversation.callback.multi.BService2;
+import org.junit.Assert;
+import org.osoa.sca.annotations.Callback;
+import org.osoa.sca.annotations.Scope;
+import org.osoa.sca.annotations.Service;
+
+@Service(interfaces= {BService.class,BService2.class})
+@Scope("CONVERSATION")
+public class BServiceImpl implements BService, BService2 {
+
+    String someState;
+
+    @Callback
+    protected AServiceCallback callback;
+
+    @Callback
+    protected AServiceCallback2 callback2;
+    
+    @Callback
+    protected AServiceCallback2 callback3;
+
+
+    public void setState(String someState) {
+        this.someState = someState;
+    }
+
+    public String getState() {
+        return someState;
+    }
+
+    public void testCallBack(String someState) {
+        callback.callBack(someState);
+    }
+
+    public void testCallBack2(String someState) {
+        Assert.assertNotNull(callback3); //Spec lines 670,671
+        callback2.callBack2(someState);
+    }
+
+}
diff --git a/java/sca/vtest/java-api/conversation/callback/src/main/java/org/apache/tuscany/sca/vtest/javaapi/conversation/callback/stateless/BServiceCallback.java b/java/sca/vtest/java-api/conversation/callback/src/main/java/org/apache/tuscany/sca/vtest/javaapi/conversation/callback/stateless/BServiceCallback.java
new file mode 100644
index 0000000000..cb9aee2b9f
--- /dev/null
+++ b/java/sca/vtest/java-api/conversation/callback/src/main/java/org/apache/tuscany/sca/vtest/javaapi/conversation/callback/stateless/BServiceCallback.java
@@ -0,0 +1,31 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ * 
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ * 
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.    
+ */
+package org.apache.tuscany.sca.vtest.javaapi.conversation.callback.stateless;
+
+import org.osoa.sca.annotations.Remotable;
+
+/**
+ * Simple Service
+ */
+@Remotable
+public interface BServiceCallback {
+
+    public void callBack(String someState);
+    
+}
diff --git a/java/sca/vtest/java-api/conversation/callback/src/main/java/org/apache/tuscany/sca/vtest/javaapi/conversation/callback/stateless/CService.java b/java/sca/vtest/java-api/conversation/callback/src/main/java/org/apache/tuscany/sca/vtest/javaapi/conversation/callback/stateless/CService.java
new file mode 100644
index 0000000000..1fe70344af
--- /dev/null
+++ b/java/sca/vtest/java-api/conversation/callback/src/main/java/org/apache/tuscany/sca/vtest/javaapi/conversation/callback/stateless/CService.java
@@ -0,0 +1,39 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ * 
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ * 
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.    
+ */
+package org.apache.tuscany.sca.vtest.javaapi.conversation.callback.stateless;
+
+import org.osoa.sca.annotations.Callback;
+import org.osoa.sca.annotations.Conversational;
+import org.osoa.sca.annotations.Remotable;
+
+/**
+ * Simple Service
+ */
+@Remotable
+@Conversational
+@Callback(BServiceCallback.class)
+public interface CService {
+
+    public void setState(String someState);
+
+    public String getState();
+
+    public void testCallBack(String string);
+
+}
diff --git a/java/sca/vtest/java-api/conversation/callback/src/main/java/org/apache/tuscany/sca/vtest/javaapi/conversation/callback/stateless/impl/BServiceImpl.java b/java/sca/vtest/java-api/conversation/callback/src/main/java/org/apache/tuscany/sca/vtest/javaapi/conversation/callback/stateless/impl/BServiceImpl.java
new file mode 100644
index 0000000000..033fa9d097
--- /dev/null
+++ b/java/sca/vtest/java-api/conversation/callback/src/main/java/org/apache/tuscany/sca/vtest/javaapi/conversation/callback/stateless/impl/BServiceImpl.java
@@ -0,0 +1,73 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ * 
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ * 
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.    
+ */
+
+package org.apache.tuscany.sca.vtest.javaapi.conversation.callback.stateless.impl;
+
+import org.apache.tuscany.sca.vtest.javaapi.conversation.callback.AServiceCallback;
+import org.apache.tuscany.sca.vtest.javaapi.conversation.callback.BService;
+import org.apache.tuscany.sca.vtest.javaapi.conversation.callback.stateless.BServiceCallback;
+import org.apache.tuscany.sca.vtest.javaapi.conversation.callback.CService;
+import org.apache.tuscany.sca.vtest.javaapi.conversation.callback.Utilities;
+import org.junit.Assert;
+import org.osoa.sca.ServiceReference;
+import org.osoa.sca.annotations.Callback;
+import org.osoa.sca.annotations.Reference;
+import org.osoa.sca.annotations.Scope;
+import org.osoa.sca.annotations.Service;
+
+@Service(BService.class)
+@Scope("CONVERSATION")
+public class BServiceImpl implements BService, BServiceCallback {
+
+    String someState;
+
+    @Callback
+    protected AServiceCallback callback;
+
+    @Reference
+    protected ServiceReference<CService> c;
+
+    public void setState(String someState) {
+        this.someState = someState;
+    }
+
+    public String getState() {
+        return someState;
+    }
+
+    public void callBack(String someState) {
+        System.out.println("B-callback called with this state => " + someState);
+        this.someState = someState;
+    }
+
+    public void testCallBack(String someState) {
+
+        c.getService().testCallBack(someState);
+        int count = 4;
+        while (this.someState == null && count > 0) {
+            Utilities.delayQuarterSecond();
+            count--;
+        }
+        if (this.someState != null)
+            Assert.fail("Callback should NOT have been received by this instance");
+
+        callback.callBack(someState);
+    }
+
+}
diff --git a/java/sca/vtest/java-api/conversation/callback/src/main/java/org/apache/tuscany/sca/vtest/javaapi/conversation/callback/stateless/impl/BServiceImpl2.java b/java/sca/vtest/java-api/conversation/callback/src/main/java/org/apache/tuscany/sca/vtest/javaapi/conversation/callback/stateless/impl/BServiceImpl2.java
new file mode 100644
index 0000000000..5f7d8d9c94
--- /dev/null
+++ b/java/sca/vtest/java-api/conversation/callback/src/main/java/org/apache/tuscany/sca/vtest/javaapi/conversation/callback/stateless/impl/BServiceImpl2.java
@@ -0,0 +1,81 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ * 
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ * 
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.    
+ */
+
+package org.apache.tuscany.sca.vtest.javaapi.conversation.callback.stateless.impl;
+
+import org.apache.tuscany.sca.vtest.javaapi.conversation.callback.AServiceCallback;
+import org.apache.tuscany.sca.vtest.javaapi.conversation.callback.BService;
+import org.apache.tuscany.sca.vtest.javaapi.conversation.callback.stateless.BServiceCallback;
+import org.apache.tuscany.sca.vtest.javaapi.conversation.callback.CService;
+import org.apache.tuscany.sca.vtest.javaapi.conversation.callback.Utilities;
+import org.junit.Assert;
+import org.osoa.sca.RequestContext;
+import org.osoa.sca.ServiceReference;
+import org.osoa.sca.annotations.Callback;
+import org.osoa.sca.annotations.Context;
+import org.osoa.sca.annotations.Reference;
+import org.osoa.sca.annotations.Scope;
+import org.osoa.sca.annotations.Service;
+
+@Service(BService.class)
+@Scope("CONVERSATION")
+public class BServiceImpl2 implements BService, BServiceCallback {
+
+    String someState;
+    
+    @Context
+    protected RequestContext rc;
+
+    @Callback
+    protected AServiceCallback callback;
+
+    @Reference
+    protected ServiceReference<CService> c;
+
+    public void setState(String someState) {
+        this.someState = someState;
+    }
+
+    public String getState() {
+        return someState;
+    }
+
+    public void callBack(String someState) {
+        System.out.println("B-callback called with this state => " + someState);
+        this.someState = someState;
+        Assert.assertSame("1234", rc.getServiceReference().getCallbackID());
+    }
+
+    public void testCallBack(String someState) {
+
+        c.setCallbackID("1234");
+
+        c.getService().testCallBack(someState);
+        int count = 4;
+        while (this.someState == null && count > 0) {
+            Utilities.delayQuarterSecond();
+            count--;
+        }
+        if (this.someState != null)
+            Assert.fail("Callback should NOT have been received by this instance");
+
+        callback.callBack(someState);
+    }
+
+}
diff --git a/java/sca/vtest/java-api/conversation/callback/src/main/java/org/apache/tuscany/sca/vtest/javaapi/conversation/callback/stateless/impl/BServiceImpl3.java b/java/sca/vtest/java-api/conversation/callback/src/main/java/org/apache/tuscany/sca/vtest/javaapi/conversation/callback/stateless/impl/BServiceImpl3.java
new file mode 100644
index 0000000000..47d5d53821
--- /dev/null
+++ b/java/sca/vtest/java-api/conversation/callback/src/main/java/org/apache/tuscany/sca/vtest/javaapi/conversation/callback/stateless/impl/BServiceImpl3.java
@@ -0,0 +1,74 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ * 
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ * 
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.    
+ */
+
+package org.apache.tuscany.sca.vtest.javaapi.conversation.callback.stateless.impl;
+
+import org.apache.tuscany.sca.vtest.javaapi.conversation.callback.AServiceCallback;
+import org.apache.tuscany.sca.vtest.javaapi.conversation.callback.BService;
+import org.apache.tuscany.sca.vtest.javaapi.conversation.callback.stateless.BServiceCallback;
+import org.apache.tuscany.sca.vtest.javaapi.conversation.callback.CService;
+import org.apache.tuscany.sca.vtest.javaapi.conversation.callback.Utilities;
+import org.junit.Assert;
+import org.osoa.sca.ServiceReference;
+import org.osoa.sca.annotations.Callback;
+import org.osoa.sca.annotations.Reference;
+import org.osoa.sca.annotations.Scope;
+import org.osoa.sca.annotations.Service;
+
+@Service(BService.class)
+@Scope("CONVERSATION")
+public class BServiceImpl3 implements BService, BServiceCallback {
+
+    String someState;
+
+    @Callback
+    protected AServiceCallback callback;
+
+    @Reference
+    protected ServiceReference<CService> c;
+
+    public void setState(String someState) {
+        this.someState = someState;
+    }
+
+    public String getState() {
+        return someState;
+    }
+
+    public void callBack(String someState) {
+        System.out.println("B-callback called with this state => " + someState);
+        this.someState = someState;
+        Assert.assertSame(null, callback);
+    }
+
+    public void testCallBack(String someState) {
+
+        c.getService().testCallBack(someState);
+        int count = 4;
+        while (this.someState == null && count > 0) {
+            Utilities.delayQuarterSecond();
+            count--;
+        }
+        if (this.someState != null)
+            Assert.fail("Callback should NOT have been received by this instance");
+
+        callback.callBack(someState);
+    }
+
+}
diff --git a/java/sca/vtest/java-api/conversation/callback/src/main/java/org/apache/tuscany/sca/vtest/javaapi/conversation/callback/stateless/impl/CServiceImpl.java b/java/sca/vtest/java-api/conversation/callback/src/main/java/org/apache/tuscany/sca/vtest/javaapi/conversation/callback/stateless/impl/CServiceImpl.java
new file mode 100644
index 0000000000..18ce5edebe
--- /dev/null
+++ b/java/sca/vtest/java-api/conversation/callback/src/main/java/org/apache/tuscany/sca/vtest/javaapi/conversation/callback/stateless/impl/CServiceImpl.java
@@ -0,0 +1,49 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ * 
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ * 
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.    
+ */
+
+package org.apache.tuscany.sca.vtest.javaapi.conversation.callback.stateless.impl;
+
+import org.apache.tuscany.sca.vtest.javaapi.conversation.callback.stateless.BServiceCallback;
+import org.apache.tuscany.sca.vtest.javaapi.conversation.callback.stateless.CService;
+import org.osoa.sca.annotations.Callback;
+import org.osoa.sca.annotations.Scope;
+import org.osoa.sca.annotations.Service;
+
+@Service(CService.class)
+@Scope("CONVERSATION")
+public class CServiceImpl implements CService {
+
+    String someState;
+
+    @Callback
+    protected BServiceCallback callback;
+
+    public void setState(String someState) {
+        this.someState = someState;
+    }
+
+    public String getState() {
+        return someState;
+    }
+
+    public void testCallBack(String someState) {
+        callback.callBack(someState);
+    }
+
+}
diff --git a/java/sca/vtest/java-api/conversation/callback/src/main/resources/callback-accessing.composite b/java/sca/vtest/java-api/conversation/callback/src/main/resources/callback-accessing.composite
new file mode 100644
index 0000000000..802c9c30db
--- /dev/null
+++ b/java/sca/vtest/java-api/conversation/callback/src/main/resources/callback-accessing.composite
@@ -0,0 +1,34 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!--
+	* Licensed to the Apache Software Foundation (ASF) under one
+	* or more contributor license agreements.  See the NOTICE file
+	* distributed with this work for additional information
+	* regarding copyright ownership.  The ASF licenses this file
+	* to you under the Apache License, Version 2.0 (the
+	* "License"); you may not use this file except in compliance
+	* with the License.  You may obtain a copy of the License at
+	*
+	*   http://www.apache.org/licenses/LICENSE-2.0
+	*
+	* Unless required by applicable law or agreed to in writing,
+	* software distributed under the License is distributed on an
+	* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+	* KIND, either express or implied.  See the License for the
+	* specific language governing permissions and limitations
+	* under the License.
+-->
+<composite xmlns="http://www.osoa.org/xmlns/sca/1.0"
+	targetNamespace="http://java-api-tests" name="Conversation-callback-multi">
+
+	<component name="AComponent">
+		<implementation.java
+			class="org.apache.tuscany.sca.vtest.javaapi.conversation.callback.accessing.impl.AServiceImpl" />
+		<reference name="b" target="BComponent" />
+	</component>
+
+	<component name="BComponent">
+		<implementation.java
+			class="org.apache.tuscany.sca.vtest.javaapi.conversation.callback.accessing.impl.BServiceImpl" />
+	</component>
+
+</composite>
diff --git a/java/sca/vtest/java-api/conversation/callback/src/main/resources/callback-custom.composite b/java/sca/vtest/java-api/conversation/callback/src/main/resources/callback-custom.composite
new file mode 100644
index 0000000000..e66ea5d537
--- /dev/null
+++ b/java/sca/vtest/java-api/conversation/callback/src/main/resources/callback-custom.composite
@@ -0,0 +1,40 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!--
+	* Licensed to the Apache Software Foundation (ASF) under one
+	* or more contributor license agreements.  See the NOTICE file
+	* distributed with this work for additional information
+	* regarding copyright ownership.  The ASF licenses this file
+	* to you under the Apache License, Version 2.0 (the
+	* "License"); you may not use this file except in compliance
+	* with the License.  You may obtain a copy of the License at
+	*
+	*   http://www.apache.org/licenses/LICENSE-2.0
+	*
+	* Unless required by applicable law or agreed to in writing,
+	* software distributed under the License is distributed on an
+	* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+	* KIND, either express or implied.  See the License for the
+	* specific language governing permissions and limitations
+	* under the License.
+-->
+<composite xmlns="http://www.osoa.org/xmlns/sca/1.0"
+	targetNamespace="http://java-api-tests" name="Conversation-callback-custom">
+
+	<component name="AComponent">
+		<implementation.java
+			class="org.apache.tuscany.sca.vtest.javaapi.conversation.callback.custom.impl.AServiceImpl" />
+		<reference name="b" target="BComponent" />
+		<reference name="customCallback" target="CComponent/CustomCallback" />
+	</component>
+
+	<component name="BComponent">
+		<implementation.java
+			class="org.apache.tuscany.sca.vtest.javaapi.conversation.callback.custom.impl.BServiceImpl" />
+	</component>
+	
+	<component name="CComponent">
+		<implementation.java
+			class="org.apache.tuscany.sca.vtest.javaapi.conversation.callback.custom.impl.CustomCallbackImpl" />
+	</component>
+
+</composite>
diff --git a/java/sca/vtest/java-api/conversation/callback/src/main/resources/callback-id.composite b/java/sca/vtest/java-api/conversation/callback/src/main/resources/callback-id.composite
new file mode 100644
index 0000000000..4d93d2279d
--- /dev/null
+++ b/java/sca/vtest/java-api/conversation/callback/src/main/resources/callback-id.composite
@@ -0,0 +1,34 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!--
+	* Licensed to the Apache Software Foundation (ASF) under one
+	* or more contributor license agreements.  See the NOTICE file
+	* distributed with this work for additional information
+	* regarding copyright ownership.  The ASF licenses this file
+	* to you under the Apache License, Version 2.0 (the
+	* "License"); you may not use this file except in compliance
+	* with the License.  You may obtain a copy of the License at
+	*
+	*   http://www.apache.org/licenses/LICENSE-2.0
+	*
+	* Unless required by applicable law or agreed to in writing,
+	* software distributed under the License is distributed on an
+	* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+	* KIND, either express or implied.  See the License for the
+	* specific language governing permissions and limitations
+	* under the License.
+-->
+<composite xmlns="http://www.osoa.org/xmlns/sca/1.0"
+	targetNamespace="http://java-api-tests" name="Conversation-callback-id">
+
+	<component name="AComponent">
+		<implementation.java
+			class="org.apache.tuscany.sca.vtest.javaapi.conversation.callback.id.impl.AServiceImpl" />
+		<reference name="b" target="BComponent" />
+	</component>
+
+	<component name="BComponent">
+		<implementation.java
+			class="org.apache.tuscany.sca.vtest.javaapi.conversation.callback.id.impl.BServiceImpl" />
+	</component>
+
+</composite>
diff --git a/java/sca/vtest/java-api/conversation/callback/src/main/resources/callback-local.composite b/java/sca/vtest/java-api/conversation/callback/src/main/resources/callback-local.composite
new file mode 100644
index 0000000000..cd8c589a59
--- /dev/null
+++ b/java/sca/vtest/java-api/conversation/callback/src/main/resources/callback-local.composite
@@ -0,0 +1,40 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!--
+	* Licensed to the Apache Software Foundation (ASF) under one
+	* or more contributor license agreements.  See the NOTICE file
+	* distributed with this work for additional information
+	* regarding copyright ownership.  The ASF licenses this file
+	* to you under the Apache License, Version 2.0 (the
+	* "License"); you may not use this file except in compliance
+	* with the License.  You may obtain a copy of the License at
+	*
+	*   http://www.apache.org/licenses/LICENSE-2.0
+	*
+	* Unless required by applicable law or agreed to in writing,
+	* software distributed under the License is distributed on an
+	* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+	* KIND, either express or implied.  See the License for the
+	* specific language governing permissions and limitations
+	* under the License.
+-->
+<composite xmlns="http://www.osoa.org/xmlns/sca/1.0"
+	targetNamespace="http://java-api-tests" name="Conversation-Callback-local">
+
+	<component name="AComponent">
+		<implementation.java
+			class="org.apache.tuscany.sca.vtest.javaapi.conversation.callback.local.impl.AServiceImpl" />
+		<reference name="b" target="BComponent" />
+	</component>
+
+	<component name="BComponent">
+		<implementation.java
+			class="org.apache.tuscany.sca.vtest.javaapi.conversation.callback.local.impl.BServiceImpl" />
+		<reference name="c" target="CComponent" />
+	</component>
+	
+	<component name="CComponent">
+		<implementation.java
+			class="org.apache.tuscany.sca.vtest.javaapi.conversation.callback.local.impl.CServiceImpl" />
+	</component>
+
+</composite>
diff --git a/java/sca/vtest/java-api/conversation/callback/src/main/resources/callback-mixed.composite b/java/sca/vtest/java-api/conversation/callback/src/main/resources/callback-mixed.composite
new file mode 100644
index 0000000000..d2d9956103
--- /dev/null
+++ b/java/sca/vtest/java-api/conversation/callback/src/main/resources/callback-mixed.composite
@@ -0,0 +1,40 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!--
+	* Licensed to the Apache Software Foundation (ASF) under one
+	* or more contributor license agreements.  See the NOTICE file
+	* distributed with this work for additional information
+	* regarding copyright ownership.  The ASF licenses this file
+	* to you under the Apache License, Version 2.0 (the
+	* "License"); you may not use this file except in compliance
+	* with the License.  You may obtain a copy of the License at
+	*
+	*   http://www.apache.org/licenses/LICENSE-2.0
+	*
+	* Unless required by applicable law or agreed to in writing,
+	* software distributed under the License is distributed on an
+	* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+	* KIND, either express or implied.  See the License for the
+	* specific language governing permissions and limitations
+	* under the License.
+-->
+<composite xmlns="http://www.osoa.org/xmlns/sca/1.0"
+	targetNamespace="http://java-api-tests" name="Conversation-callback-mixed">
+<!-- TODO: TUSCANY-2291 
+	<component name="AComponent">
+		<implementation.java
+			class="org.apache.tuscany.sca.vtest.javaapi.conversation.callback.impl.AServiceImpl" />
+		<reference name="b" target="BComponent" />
+	</component>
+
+	<component name="BComponent">
+		<implementation.java
+			class="org.apache.tuscany.sca.vtest.javaapi.conversation.callback.mixed.impl.BServiceImpl" />
+		<reference name="c" target="CComponent" />
+	</component>
+	
+	<component name="CComponent">
+		<implementation.java
+			class="org.apache.tuscany.sca.vtest.javaapi.conversation.callback.mixed.impl.CServiceImpl" />
+	</component>
+-->
+</composite>
diff --git a/java/sca/vtest/java-api/conversation/callback/src/main/resources/callback-multi.composite b/java/sca/vtest/java-api/conversation/callback/src/main/resources/callback-multi.composite
new file mode 100644
index 0000000000..6c69330ce5
--- /dev/null
+++ b/java/sca/vtest/java-api/conversation/callback/src/main/resources/callback-multi.composite
@@ -0,0 +1,35 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!--
+	* Licensed to the Apache Software Foundation (ASF) under one
+	* or more contributor license agreements.  See the NOTICE file
+	* distributed with this work for additional information
+	* regarding copyright ownership.  The ASF licenses this file
+	* to you under the Apache License, Version 2.0 (the
+	* "License"); you may not use this file except in compliance
+	* with the License.  You may obtain a copy of the License at
+	*
+	*   http://www.apache.org/licenses/LICENSE-2.0
+	*
+	* Unless required by applicable law or agreed to in writing,
+	* software distributed under the License is distributed on an
+	* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+	* KIND, either express or implied.  See the License for the
+	* specific language governing permissions and limitations
+	* under the License.
+-->
+<composite xmlns="http://www.osoa.org/xmlns/sca/1.0"
+	targetNamespace="http://java-api-tests" name="Conversation-callback-multi">
+
+	<component name="AComponent">
+		<implementation.java
+			class="org.apache.tuscany.sca.vtest.javaapi.conversation.callback.multi.impl.AServiceImpl" />
+		<reference name="b" target="BComponent/BService" />
+		<reference name="b2" target="BComponent/BService2" />
+	</component>
+
+	<component name="BComponent">
+		<implementation.java
+			class="org.apache.tuscany.sca.vtest.javaapi.conversation.callback.multi.impl.BServiceImpl" />
+	</component>
+
+</composite>
diff --git a/java/sca/vtest/java-api/conversation/callback/src/main/resources/callback-stateless-callbackfieldnull.composite b/java/sca/vtest/java-api/conversation/callback/src/main/resources/callback-stateless-callbackfieldnull.composite
new file mode 100644
index 0000000000..72c08e8344
--- /dev/null
+++ b/java/sca/vtest/java-api/conversation/callback/src/main/resources/callback-stateless-callbackfieldnull.composite
@@ -0,0 +1,40 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!--
+	* Licensed to the Apache Software Foundation (ASF) under one
+	* or more contributor license agreements.  See the NOTICE file
+	* distributed with this work for additional information
+	* regarding copyright ownership.  The ASF licenses this file
+	* to you under the Apache License, Version 2.0 (the
+	* "License"); you may not use this file except in compliance
+	* with the License.  You may obtain a copy of the License at
+	*
+	*   http://www.apache.org/licenses/LICENSE-2.0
+	*
+	* Unless required by applicable law or agreed to in writing,
+	* software distributed under the License is distributed on an
+	* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+	* KIND, either express or implied.  See the License for the
+	* specific language governing permissions and limitations
+	* under the License.
+-->
+<composite xmlns="http://www.osoa.org/xmlns/sca/1.0"
+	targetNamespace="http://java-api-tests" name="Conversation-callback-stateless">
+
+	<component name="AComponent">
+		<implementation.java
+			class="org.apache.tuscany.sca.vtest.javaapi.conversation.callback.impl.AServiceImpl" />
+		<reference name="b" target="BComponent" />
+	</component>
+
+	<component name="BComponent">
+		<implementation.java
+			class="org.apache.tuscany.sca.vtest.javaapi.conversation.callback.stateless.impl.BServiceImpl3" />
+		<reference name="c" target="CComponent" />
+	</component>
+	
+	<component name="CComponent">
+		<implementation.java
+			class="org.apache.tuscany.sca.vtest.javaapi.conversation.callback.stateless.impl.CServiceImpl" />
+	</component>
+
+</composite>
diff --git a/java/sca/vtest/java-api/conversation/callback/src/main/resources/callback-stateless-callbackid.composite b/java/sca/vtest/java-api/conversation/callback/src/main/resources/callback-stateless-callbackid.composite
new file mode 100644
index 0000000000..144f7f3d00
--- /dev/null
+++ b/java/sca/vtest/java-api/conversation/callback/src/main/resources/callback-stateless-callbackid.composite
@@ -0,0 +1,40 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!--
+	* Licensed to the Apache Software Foundation (ASF) under one
+	* or more contributor license agreements.  See the NOTICE file
+	* distributed with this work for additional information
+	* regarding copyright ownership.  The ASF licenses this file
+	* to you under the Apache License, Version 2.0 (the
+	* "License"); you may not use this file except in compliance
+	* with the License.  You may obtain a copy of the License at
+	*
+	*   http://www.apache.org/licenses/LICENSE-2.0
+	*
+	* Unless required by applicable law or agreed to in writing,
+	* software distributed under the License is distributed on an
+	* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+	* KIND, either express or implied.  See the License for the
+	* specific language governing permissions and limitations
+	* under the License.
+-->
+<composite xmlns="http://www.osoa.org/xmlns/sca/1.0"
+	targetNamespace="http://java-api-tests" name="Conversation-callback-stateless">
+
+	<component name="AComponent">
+		<implementation.java
+			class="org.apache.tuscany.sca.vtest.javaapi.conversation.callback.impl.AServiceImpl" />
+		<reference name="b" target="BComponent" />
+	</component>
+
+	<component name="BComponent">
+		<implementation.java
+			class="org.apache.tuscany.sca.vtest.javaapi.conversation.callback.stateless.impl.BServiceImpl2" />
+		<reference name="c" target="CComponent" />
+	</component>
+	
+	<component name="CComponent">
+		<implementation.java
+			class="org.apache.tuscany.sca.vtest.javaapi.conversation.callback.stateless.impl.CServiceImpl" />
+	</component>
+
+</composite>
diff --git a/java/sca/vtest/java-api/conversation/callback/src/main/resources/callback-stateless.composite b/java/sca/vtest/java-api/conversation/callback/src/main/resources/callback-stateless.composite
new file mode 100644
index 0000000000..ace06b245c
--- /dev/null
+++ b/java/sca/vtest/java-api/conversation/callback/src/main/resources/callback-stateless.composite
@@ -0,0 +1,41 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!--
+	* Licensed to the Apache Software Foundation (ASF) under one
+	* or more contributor license agreements.  See the NOTICE file
+	* distributed with this work for additional information
+	* regarding copyright ownership.  The ASF licenses this file
+	* to you under the Apache License, Version 2.0 (the
+	* "License"); you may not use this file except in compliance
+	* with the License.  You may obtain a copy of the License at
+	*
+	*   http://www.apache.org/licenses/LICENSE-2.0
+	*
+	* Unless required by applicable law or agreed to in writing,
+	* software distributed under the License is distributed on an
+	* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+	* KIND, either express or implied.  See the License for the
+	* specific language governing permissions and limitations
+	* under the License.
+-->
+<composite xmlns="http://www.osoa.org/xmlns/sca/1.0"
+	targetNamespace="http://java-api-tests" name="Conversation-callback-stateless">
+
+	<component name="AComponent">
+		<implementation.java
+			class="org.apache.tuscany.sca.vtest.javaapi.conversation.callback.impl.AServiceImpl" />
+		<reference name="b" target="BComponent" />
+	</component>
+
+	<component name="BComponent">
+		<implementation.java
+			class="org.apache.tuscany.sca.vtest.javaapi.conversation.callback.stateless.impl.BServiceImpl" />
+		<reference name="c" target="CComponent" />
+	</component>
+	
+	<component name="CComponent">
+		<implementation.java
+			class="org.apache.tuscany.sca.vtest.javaapi.conversation.callback.stateless.impl.CServiceImpl" />
+	</component>
+
+
+</composite>
diff --git a/java/sca/vtest/java-api/conversation/callback/src/main/resources/callback.composite b/java/sca/vtest/java-api/conversation/callback/src/main/resources/callback.composite
new file mode 100644
index 0000000000..4623f17ca2
--- /dev/null
+++ b/java/sca/vtest/java-api/conversation/callback/src/main/resources/callback.composite
@@ -0,0 +1,40 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!--
+	* Licensed to the Apache Software Foundation (ASF) under one
+	* or more contributor license agreements.  See the NOTICE file
+	* distributed with this work for additional information
+	* regarding copyright ownership.  The ASF licenses this file
+	* to you under the Apache License, Version 2.0 (the
+	* "License"); you may not use this file except in compliance
+	* with the License.  You may obtain a copy of the License at
+	*
+	*   http://www.apache.org/licenses/LICENSE-2.0
+	*
+	* Unless required by applicable law or agreed to in writing,
+	* software distributed under the License is distributed on an
+	* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+	* KIND, either express or implied.  See the License for the
+	* specific language governing permissions and limitations
+	* under the License.
+-->
+<composite xmlns="http://www.osoa.org/xmlns/sca/1.0"
+	targetNamespace="http://java-api-tests" name="Conversation-callback">
+
+	<component name="AComponent">
+		<implementation.java
+			class="org.apache.tuscany.sca.vtest.javaapi.conversation.callback.impl.AServiceImpl" />
+		<reference name="b" target="BComponent" />
+	</component>
+
+	<component name="BComponent">
+		<implementation.java
+			class="org.apache.tuscany.sca.vtest.javaapi.conversation.callback.impl.BServiceImpl" />
+		<reference name="c" target="CComponent" />
+	</component>
+	
+	<component name="CComponent">
+		<implementation.java
+			class="org.apache.tuscany.sca.vtest.javaapi.conversation.callback.impl.CServiceImpl" />
+	</component>
+
+</composite>
diff --git a/java/sca/vtest/java-api/conversation/callback/src/test/java/org/apache/tuscany/sca/vtest/javaapi/conversation/callback/CallbackTestCase.java b/java/sca/vtest/java-api/conversation/callback/src/test/java/org/apache/tuscany/sca/vtest/javaapi/conversation/callback/CallbackTestCase.java
new file mode 100644
index 0000000000..dc681a4e7e
--- /dev/null
+++ b/java/sca/vtest/java-api/conversation/callback/src/test/java/org/apache/tuscany/sca/vtest/javaapi/conversation/callback/CallbackTestCase.java
@@ -0,0 +1,377 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ * 
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ * 
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.    
+ */
+
+package org.apache.tuscany.sca.vtest.javaapi.conversation.callback;
+
+import org.apache.tuscany.sca.vtest.utilities.ServiceFinder;
+import org.junit.After;
+import org.junit.Before;
+import org.junit.Ignore;
+import org.junit.Test;
+import org.osoa.sca.ServiceRuntimeException;
+
+/**
+ * 
+ */
+public class CallbackTestCase {
+
+    protected static AService aService = null;
+
+    @Before
+    public void init() throws Exception {
+        try {
+            System.out.println("Setting up");
+        } catch (Exception ex) {
+            ex.printStackTrace();
+        }
+    }
+
+    @After
+    public void destroy() throws Exception {
+
+        System.out.println("Cleaning up");
+        ServiceFinder.cleanup();
+    }
+
+    /**
+     * Lines 529-610
+     * <p>
+     * A callback service is a service that is used for asynchronous
+     * communication from a service provider back to its client in contrast to
+     * the communication through return values from synchronous operations.
+     * Callbacks are used by bidirectional services, which are services that
+     * have two interfaces: • an interface for the provided service • a callback
+     * interface that must be provided by the client
+     * <p>
+     * Callbacks may be used for both remotable and local services. Either both
+     * interfaces of a bidirectional service must be remotable, or both must be
+     * local. It is illegal to mix the two. There are two basic forms of
+     * callbacks: stateless callbacks and stateful callbacks. A callback
+     * interface is declared by using the "@Callback" annotation on a remotable
+     * service interface, which takes the Java Class object of the interface as
+     * a parameter. The annotation may also be applied to a method or to a field
+     * of an implementation, which is used in order to have a callback injected,
+     * as explained in the next section.
+     * <p>
+     * 1.6.7.1. Stateful Callbacks A stateful callback represents a specific
+     * implementation instance of the component that is the client of the
+     * service. The interface of a stateful callback should be marked as
+     * conversational. The following example interfaces define an interaction
+     * over stateful callback.
+     * <p>
+     * An implementation of the service in this example could use the
+     * "@Callback" annotation to request that a stateful callback be injected.
+     * The following is a fragment of an implementation of the example service.
+     * In this example, the request is passed on to some other component, so
+     * that the example service acts essentially as an intermediary. Because the
+     * service is conversation scoped, the callback will still be available when
+     * the backend service sends back its asynchronous response.
+     * <p>
+     * This fragment must come from an implementation that offers two services,
+     * one that it offers to it clients (MyService) and one that is used for
+     * receiving callbacks from the back end (MyServiceCallback). The client of
+     * this service would also implement the methods defined in
+     * MyServiceCallback.
+     * <p>
+     * Stateful callbacks support some of the same use cases as are supported by
+     * the ability to pass service references as parameters. The primary
+     * difference is that stateful callbacks do not require any additional
+     * parameters be passed with service operations. This can be a great
+     * convenience. If the service has many operations and any of those
+     * operations could be the first operation of the conversation, it would be
+     * unwieldy to have to take a callback parameter as part of every operation,
+     * just in case it is the first operation of the conversation. It is also
+     * more natural than requiring the application developers to invoke an
+     * explicit operation whose only purpose is to pass the callback object that
+     * should be used.
+     * <p>
+     * This tests the *remote* bidirectional interfaces option
+     */
+    @Test
+    public void statefulCallback() throws Exception {
+        System.out.println("Setting up for callback tests");
+        ServiceFinder.init("callback.composite");
+        aService = ServiceFinder.getService(AService.class, "AComponent");
+        aService.testCallback();
+    }
+
+    /**
+     * Lines 529-610
+     * <p>
+     * A callback service is a service that is used for asynchronous
+     * communication from a service provider back to its client in contrast to
+     * the communication through return values from synchronous operations.
+     * Callbacks are used by bidirectional services, which are services that
+     * have two interfaces: • an interface for the provided service • a callback
+     * interface that must be provided by the client
+     * <p>
+     * Callbacks may be used for both remotable and local services. Either both
+     * interfaces of a bidirectional service must be remotable, or both must be
+     * local. It is illegal to mix the two. There are two basic forms of
+     * callbacks: stateless callbacks and stateful callbacks. A callback
+     * interface is declared by using the "@Callback" annotation on a remotable
+     * service interface, which takes the Java Class object of the interface as
+     * a parameter. The annotation may also be applied to a method or to a field
+     * of an implementation, which is used in order to have a callback injected,
+     * as explained in the next section.
+     * <p>
+     * 1.6.7.1. Stateful Callbacks A stateful callback represents a specific
+     * implementation instance of the component that is the client of the
+     * service. The interface of a stateful callback should be marked as
+     * conversational. The following example interfaces define an interaction
+     * over stateful callback.
+     * <p>
+     * An implementation of the service in this example could use the
+     * "@Callback" annotation to request that a stateful callback be injected.
+     * The following is a fragment of an implementation of the example service.
+     * In this example, the request is passed on to some other component, so
+     * that the example service acts essentially as an intermediary. Because the
+     * service is conversation scoped, the callback will still be available when
+     * the backend service sends back its asynchronous response.
+     * <p>
+     * This fragment must come from an implementation that offers two services,
+     * one that it offers to it clients (MyService) and one that is used for
+     * receiving callbacks from the back end (MyServiceCallback). The client of
+     * this service would also implement the methods defined in
+     * MyServiceCallback.
+     * <p>
+     * Stateful callbacks support some of the same use cases as are supported by
+     * the ability to pass service references as parameters. The primary
+     * difference is that stateful callbacks do not require any additional
+     * parameters be passed with service operations. This can be a great
+     * convenience. If the service has many operations and any of those
+     * operations could be the first operation of the conversation, it would be
+     * unwieldy to have to take a callback parameter as part of every operation,
+     * just in case it is the first operation of the conversation. It is also
+     * more natural than requiring the application developers to invoke an
+     * explicit operation whose only purpose is to pass the callback object that
+     * should be used.
+     * <p>
+     * This tests the *local* bidirectional interfaces option
+     */
+    @Test
+    public void localstatefulCallback() throws Exception {
+        System.out.println("Setting up for local callback tests");
+        ServiceFinder.init("callback-local.composite");
+        aService = ServiceFinder.getService(AService.class, "AComponent");
+        aService.testCallback();
+    }
+
+    /**
+     * Lines 534, 535
+     * <p>
+     * Callbacks may be used for both remotable and local services. Either both
+     * interfaces of a bidirectional service must be remotable, or both must be
+     * local. It is illegal to mix the two.
+     * <p>
+     * In this test configuration BServiceCallback is remotable and CService is
+     * not
+     */
+    @Test(expected = ServiceRuntimeException.class)
+    @Ignore("TUSCANY-2291")
+    public void statefulMixedCallback() throws Exception {
+        System.out.println("Setting up for mixed local/remote callback tests");
+        ServiceFinder.init("callback-mixed.composite");
+        aService = ServiceFinder.getService(AService.class, "AComponent");
+        aService.testCallback();
+    }
+
+    /**
+     * Lines 613-615
+     * <p>
+     * A stateless callback interface is a callback whose interface is not
+     * marked as conversational. Unlike stateless services, the client of that
+     * uses stateless callbacks will not have callback methods routed to an
+     * instance of the client that contains any state that is relevant to the
+     * conversation.
+     * <p>
+     * This test is identical in structure to the stateful test except that
+     * BServiceCallback is not conversational and we test that the callback is
+     * NOT routed to the same instance.
+     */
+    @Test
+    public void statelessCallback() throws Exception {
+        System.out.println("Setting up for stateless callback tests");
+        ServiceFinder.init("callback-stateless.composite");
+        aService = ServiceFinder.getService(AService.class, "AComponent");
+        aService.testCallback();
+    }
+
+    /**
+     * Lines 616-621
+     * <p>
+     * The only information that the client has to work with (other than the
+     * parameters of the callback method) is a callback ID object that is passed
+     * with requests to the service and is guaranteed to be returned with any
+     * callback.
+     * <p>
+     * The following is a repeat of the client code fragment above, but with the
+     * assumption that in this case the MyServiceCallback is stateless. The
+     * client in this case needs to set the callback ID before invoking the
+     * service and then needs to get the callback ID when the response is
+     * received.
+     * <p>
+     * Lines 747-755
+     * <p>
+     * The identity that is used to identify a callback request is, by default,
+     * generated by the system. However, it is possible to provide an
+     * application specified identity that should be used to identify the
+     * callback by calling the ServiceReference.setCallbackID() method. This can
+     * be used even either stateful or stateless callbacks. The identity will be
+     * sent to the service provider, and the binding must guarantee that the
+     * service provider will send the ID back when any callback method is
+     * invoked. The callback identity has the same restrictions as the
+     * conversation ID. It should either be a string or an object that can be
+     * serialized into XML. Bindings determine the particular mechanisms to use
+     * for transmission of the identity and these may lead to further
+     * restrictions when using a given binding.
+     * <p>
+     * TODO - Need to add explicit test back to stateful for 747-755
+     */
+    @Test
+    public void statelessCallback2() throws Exception {
+        System.out.println("Setting up for stateless callback id tests");
+        ServiceFinder.init("callback-stateless-callbackid.composite");
+        aService = ServiceFinder.getService(AService.class, "AComponent");
+        aService.testCallback();
+
+    }
+
+    /**
+     * Lines 650-654
+     * <p>
+     * The difference for stateless services is that the callback field would
+     * not be available if the component is servicing a request for anything
+     * other than the original client. So, the technique used in the previous
+     * section, where there was a response from the backend Service which was
+     * forwarded as a callback from MyService would not work because the
+     * callback field would be null when the message from the backend system was
+     * received.
+     * <p>
+     */
+    @Test
+    public void statelessCallback3() throws Exception {
+        System.out.println("Setting up for stateless callback ref null tests");
+        ServiceFinder.init("callback-stateless-callbackfieldnull.composite");
+        aService = ServiceFinder.getService(AService.class, "AComponent");
+        aService.testCallback();
+
+    }
+
+    /**
+     * Lines 658-669
+     * <p>
+     * Since it is possible for a single implementation class to implement
+     * multiple services, it is also possible for callbacks to be defined for
+     * each of the services that it implements. The service implementation can
+     * include an injected field for each of its callbacks. The runtime injects
+     * the callback onto the appropriate field based on the type of the
+     * callback. The following shows the declaration of two fields, each of
+     * which corresponds to a particular service offered by the implementation.
+     * <p>
+     * Lines 670,671
+     * <p>
+     * If a single callback has a type that is compatible with multiple declared
+     * callback fields, then all of them will be set.
+     */
+    @Test
+    public void statefulMultiBidirectional() throws Exception {
+        System.out.println("Setting up for multi-bidirectional interfaces tests");
+        ServiceFinder.init("callback-multi.composite");
+        aService = ServiceFinder.getService(AService.class, "AComponent");
+        aService.testCallback();
+        aService.testCallback2(); // Includes test for 670,671
+
+    }
+
+    /**
+     * Lines 675-706
+     * <p>
+     * In addition to injecting a reference to a callback service, it is also
+     * possible to obtain a reference to a Callback instance by annotating a
+     * field or method with the "@Callback" annotation. A reference implementing
+     * the callback service interface may be obtained using
+     * CallableReference.getService(). The following fragments come from a
+     * service implementation that uses the callback API:
+     * <p>
+     * Alternatively a callback may be retrieved programmatically using the
+     * RequestContext API. The snippet below show how to retrieve a callback in
+     * a method programmatically:
+     * <p>
+     * Lines 695, 696
+     * <p>
+     * Alternatively a callback may be retrieved programmatically using the
+     * RequestContext API. The snippet below show how to retrieve a callback in
+     * a method programmatically:
+     */
+    @Test
+    public void accessingCallbacks() throws Exception {
+        System.out.println("Setting up for callback accessing tests");
+        ServiceFinder.init("callback-accessing.composite");
+        aService = ServiceFinder.getService(AService.class, "AComponent");
+        aService.testCallback();
+        aService.testCallback2(); // Lines 695-696
+
+    }
+
+    /**
+     * Lines 708-724
+     * <p>
+     * On the client side, the service that implements the callback can access
+     * the callback ID (i.e. reference parameters) that was returned with the
+     * callback operation also by accessing the request context, as follows:
+     * <p>
+     * On the client side, the object returned by the getServiceReference()
+     * method represents the service reference that was used to send the
+     * original request. The object returned by getCallbackID() represents the
+     * identity associated with the callback, which may be a single String or
+     * may be an object (as described below in “Customizing the Callback
+     * Identity”).
+     */
+    @Test
+    public void callbackId() throws Exception {
+        System.out.println("Setting up for callback id tests");
+        ServiceFinder.init("callback-id.composite");
+        aService = ServiceFinder.getService(AService.class, "AComponent");
+        aService.testCallback();
+
+    }
+
+    /**
+     * Lines 728-732
+     * <p>
+     * By default, the client component of a service is assumed to be the
+     * callback service for the bidirectional service. However, it is possible
+     * to change the callback by using the ServiceReference.setCallback()
+     * method. The object passed as the callback should implement the interface
+     * defined for the callback, including any additional SCA semantics on that
+     * interface such as its scope and whether or not it is remotable.
+     * <p>
+     * TODO - Need to complete testing of 1.6.7.5 after resolution of t-2312
+     */
+    @Test
+    public void customCallback() throws Exception {
+        System.out.println("Setting up for custom callback tests; create domain instance");
+        ServiceFinder.init("callback-custom.composite");
+        System.out.println("Setting up for custom callback tests; get AService handle");
+        aService = ServiceFinder.getService(AService.class, "AComponent");
+        aService.testCallback();
+
+    }
+}