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diff --git a/sca-java-1.x/branches/sca-java-1.6.2/modules/core/src/main/java/org/apache/tuscany/sca/core/context/ServiceReferenceImpl.java b/sca-java-1.x/branches/sca-java-1.6.2/modules/core/src/main/java/org/apache/tuscany/sca/core/context/ServiceReferenceImpl.java
new file mode 100644
index 0000000000..1d178421cf
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+++ b/sca-java-1.x/branches/sca-java-1.6.2/modules/core/src/main/java/org/apache/tuscany/sca/core/context/ServiceReferenceImpl.java
@@ -0,0 +1,133 @@
+/*
+ * 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.core.context;
+
+import javax.xml.stream.XMLStreamReader;
+
+import org.apache.tuscany.sca.assembly.Binding;
+import org.apache.tuscany.sca.core.assembly.CompositeActivator;
+import org.apache.tuscany.sca.core.conversation.ConversationState;
+import org.apache.tuscany.sca.core.invocation.ProxyFactory;
+import org.apache.tuscany.sca.runtime.EndpointReference;
+import org.apache.tuscany.sca.runtime.ReferenceParameters;
+import org.apache.tuscany.sca.runtime.RuntimeComponent;
+import org.apache.tuscany.sca.runtime.RuntimeComponentReference;
+import org.apache.tuscany.sca.runtime.RuntimeWire;
+import org.osoa.sca.CallableReference;
+import org.osoa.sca.ServiceReference;
+
+/**
+ * Default implementation of a ServiceReference.
+ *
+ * @version $Rev$ $Date$
+ * @param <B> the type of the business interface
+ */
+public class ServiceReferenceImpl<B> extends CallableReferenceImpl<B> implements ServiceReference<B> {
+    private static final long serialVersionUID = 6763709434194361540L;
+
+    protected transient Object callback;
+
+    /*
+     * Public constructor for Externalizable serialization/deserialization
+     */
+    public ServiceReferenceImpl() {
+        super();
+    }
+
+    /*
+     * Public constructor for use by XMLStreamReader2CallableReference
+     */
+    public ServiceReferenceImpl(XMLStreamReader xmlReader) throws Exception {
+        super(xmlReader);
+    }
+
+    /**
+     * @param businessInterface
+     * @param wire
+     * @param proxyFactory
+     */
+    public ServiceReferenceImpl(Class<B> businessInterface, RuntimeWire wire, ProxyFactory proxyFactory) {
+        super(businessInterface, wire, proxyFactory);
+    }
+
+    public ServiceReferenceImpl(Class<B> businessInterface,
+                                RuntimeComponent component,
+                                RuntimeComponentReference reference,
+                                ProxyFactory proxyFactory,
+                                CompositeActivator compositeActivator) {
+        super(businessInterface, component, reference, null, proxyFactory, compositeActivator);
+    }
+
+    public ServiceReferenceImpl(Class<B> businessInterface,
+                                RuntimeComponent component,
+                                RuntimeComponentReference reference,
+                                Binding binding,
+                                ProxyFactory proxyFactory,
+                                CompositeActivator compositeActivator) {
+        super(businessInterface, component, reference, binding, proxyFactory, compositeActivator);
+    }
+
+    public Object getConversationID() {
+        return conversationID;
+    }
+
+    public void setConversationID(Object conversationID) throws IllegalStateException {
+        if (conversation == null || conversation.getState() != ConversationState.ENDED) {
+            this.conversationID = conversationID;
+            this.conversation = null;
+        } else {
+            throw new IllegalStateException("Trying to set the conversationId on a service reference but the state of the conversation " 
+                + conversation.getConversationID()
+                + " is "
+                + conversation.getState());
+        }
+    }
+
+    public void setCallbackID(Object callbackID) {
+        this.callbackID = callbackID;
+    }
+
+    public Object getCallback() {
+        return callback;
+    }
+
+    public void setCallback(Object callback) {
+        if (callback != null && !(callback instanceof CallableReference)) {
+            //FIXME: need to check if callback object supports the callback interface
+            // returned by reference.getInterfaceContract().getCallbackInterface()
+        }
+        this.callback = callback;
+    }
+
+    @Override
+    protected ReferenceParameters getReferenceParameters() {
+        ReferenceParameters parameters = super.getReferenceParameters();
+        if (callback != null) {
+            if (callback instanceof ServiceReference) {
+                EndpointReference callbackRef = ((CallableReferenceImpl)callback).getEndpointReference();
+                parameters.setCallbackReference(callbackRef);
+            } else {
+                EndpointReference callbackRef = getRuntimeWire().getSource().getCallbackEndpoint();
+                parameters.setCallbackReference(callbackRef);
+                parameters.setCallbackObjectID(callback);
+            }
+        }
+        return parameters;
+    }
+}