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When you are testing distributed systems its a very common requirement to have to stub out certain external systems with some stub so that you can test other parts of the system until a specific system is available or written etc.
A great way to do this is using some kind of Template system to generate responses to requests generating a dynamic message using a mostly-static body.
There are a number of templating components included in the Camel distribution you could use
or the following external Camel components
Here's a simple example showing how we can respond to InOut requests on the My.Queue queue on ActiveMQ with a template generated response. The reply would be sent back to the JMSReplyTo Destination.
If you want to use InOnly and consume the message and send it to another destination you could use