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diff --git a/sandbox/sebastien/java/sca-node/samples/implementation-pojo-extension/src/main/java/pojo/provider/POJOImplementationInvoker.java b/sandbox/sebastien/java/sca-node/samples/implementation-pojo-extension/src/main/java/pojo/provider/POJOImplementationInvoker.java
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+++ b/sandbox/sebastien/java/sca-node/samples/implementation-pojo-extension/src/main/java/pojo/provider/POJOImplementationInvoker.java
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+/*
+ * 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 pojo.provider;
+
+import java.lang.reflect.InvocationTargetException;
+import java.lang.reflect.Method;
+
+import org.apache.tuscany.sca.interfacedef.Operation;
+import org.apache.tuscany.sca.invocation.Invoker;
+import org.apache.tuscany.sca.invocation.Message;
+import org.osoa.sca.ServiceRuntimeException;
+
+/**
+ * Implements an invoker for POJO component implementations.
+ * 
+ * The invoker is responsible for handling invocations of a business operation.
+ * Input business data is passed to the invoke method in a Message object.
+ * The invoke method is responsible for handling the invocation and returning a Message with
+ * the output business data. 
+ * 
+ * In this example we are simply delegating the operation invocations to the
+ * corresponding methods on the POJO implementation class using Java reflection.
+ * 
+ * Depending on the type of implementation being handled, more sophisticated invokers can
+ * use other techniques to delegate the invocation to the implementation artifact directly, call a
+ * runtime engine like a BPEL engine or an XQuery engine (this is what the Tuscany 
+ * implementation-bpel and implementation-xquery extensions do) or just completely handle the
+ * invocation in the invoker itself if the implementation has a fixed behavior for example.
+ */
+class POJOImplementationInvoker implements Invoker {
+
+    private Object pojoInstance;
+    private Method method;
+    
+    POJOImplementationInvoker(Object pojoInstance, Operation operation, Method method) {
+        this.pojoInstance = pojoInstance;
+        this.method = method;
+    }
+    
+    public Message invoke(Message msg) {
+        try {
+            msg.setBody(method.invoke(pojoInstance, (Object[])msg.getBody()));
+        } catch (InvocationTargetException e) {
+            msg.setFaultBody(e);
+        } catch (Exception e) {
+            throw new ServiceRuntimeException(e);
+        }
+        return msg;
+    }
+    
+}