Copying and modifying a message by using a JavaCompute node

The incoming message and message assembly are read-only. To modify a message, a copy of the incoming message must be made. The Modifying Message Class template in the JavaCompute node wizard generates this copy. In the template code, the copy constructor of MBMessage is called to create a message that is populated by copying the input, as shown in the following Java™ code:

 MbMessage outMessage = new MbMessage(inAssembly.getMessage());
 MbMessageAssembly outAssembly = new MbMessageAssembly(inAssembly, outMessage); 

The new outAssembly, outMessage objects, or both, can now be modified and propagated to the next node.