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diff --git a/sandbox/sebastien/java/vhost/samples/getting-started/callback-api/src/main/java/sample/ClientImpl.java b/sandbox/sebastien/java/vhost/samples/getting-started/callback-api/src/main/java/sample/ClientImpl.java
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+++ b/sandbox/sebastien/java/vhost/samples/getting-started/callback-api/src/main/java/sample/ClientImpl.java
@@ -0,0 +1,108 @@
+/*
+ * 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 sample;
+
+import org.oasisopen.sca.annotation.Reference;
+import org.oasisopen.sca.annotation.Service;
+
+@Service(Client.class)
+public class ClientImpl implements Client, CallBack {
+
+    public static final String DELIMITER = "\n----------------------------";
+    
+    @Reference
+    protected sample.Service service;
+
+    private static int callBackCount = 0;
+
+    /**
+     * This function prints the message received from the service
+     * implementation.
+     * 
+     * @param String the message received from the service
+     */
+    public void callBackMessage(String aString) {
+        System.out.println("ClientImpl - Received callback message: " + aString);
+    }
+
+    /**
+     * This function increments the callBackCount variable when called from the
+     * service implementation.
+     */
+    public void callBackIncrement() {
+        System.out.println("ClientImpl - Received increment callback");
+        callBackCount++;
+        System.out.println("ClientImpl - Callback counter incremented to : " + getCallBackCount());
+    }
+
+    /**
+     * This method runs different kinds of service calls implying callbacks.
+     */
+    public void run() {
+        simpleCallBack();
+        simpleCallBackByRef();
+        noCallBack();
+        multipleCallBack();
+    }
+
+    /**
+     * The basic callback where the target calls back prior to returning to the
+     * client.
+     */
+    private void simpleCallBack() {
+        System.out.println(DELIMITER + "\nSimple callback" + DELIMITER);
+        service.knockKnock("Knock Knock");
+    }
+
+    /**
+     * The basic callback where the target calls back prior to returning to the
+     * client.
+     */
+    private void simpleCallBackByRef() {
+        System.out.println(DELIMITER + "\nSimple callback by reference" + DELIMITER);
+        service.knockKnockByRef("Knock Knock by reference");
+    }
+
+    /**
+     * The basic callback where the target does not call back to the client.
+     */
+    private void noCallBack() {
+        System.out.println(DELIMITER + "\nNo callback" + DELIMITER);
+        service.noCallBack("No Reply Desired");
+    }
+
+    /**
+     * The basic callback where the target calls back multiple times to the
+     * client.
+     */
+    private void multipleCallBack() {
+        System.out.println(DELIMITER + "\nMultiple callbacks" + DELIMITER);
+        service.multiCallBack("Call me back 3 times");
+    }
+
+    /**
+     * This function returns the callBackCount variable.
+     * 
+     * @return Integer the callBackCount variable
+     */
+    public int getCallBackCount() {
+        return callBackCount;
+    }
+
+}