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By default the onCompletion will be triggered when the Exchange is complete and regardless if the Exchange completed with success or with an failure (such as an Exception was thrown). You can limit the trigger to only occur onCompleteOnly or by onFauilureOnly onFailureOnly as shown below:

{snippet:id=e1|lang=java|url=camel/trunk/camel-core/src/test/java/org/apache/camel/processor/OnCompletionOnFailureOnlyTest.java}

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