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Messsage exchange patterns and the Exchange object

The Camel API is influenced by APIs such as JBI specification, CXF which defines a concept called Message Exchange Patterns (MEP for short).

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The Exchange API provides two methods to get a message, either getIn or getOut.
Obviously the getIn gets the IN message, and the getOut gets the OUT message.

Using getIn or getOut methods on Exchange

Now suppose you want to use a Camel Processor to adjust a message. This can be done as follows:

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