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The Composed Message Processor from the EIP patterns allows you to process a composite message by splitting it up, routing the sub-messages to appropriate destinations and the re-aggregating the responses back into a single message.

In Camel we have provide two solutions

• using both a Splitter and Aggregator EIPs
• using only a Splitter

The difference is when using only using a Splitter then it aggregates back all the splitted messages into the samme same aggregation group, eg like a fork/join pattern.
Where as Whereas using the Aggregator allows you group into multiple groups, and the a pattern has which provides more options.

Example using both Splitter and Aggregator

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{snippet:id=e3|lang=java|url=camel/trunk/camel-core/src/test/java/org/apache/camel/processor/SplitAggregateInOutTest.java}