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{snippet:id=idempotent|lang=java|url=activemq/camel/trunk/camel-core/src/test/java/org/apache/camel/builder/RouteBuilderTest.java}

The above example will use an in-memory based MessageIdRepository which can easily run out of memory and doesn't work in a clustered environment. So you might prefer to use the JPA based implementation which uses a database to store the message IDs which have been processed

{snippet:id=idempotent|lang=java|url=activemq/camel/trunk/camel-jpa/src/test/java/org/apache/camel/processor/jpa/JpaIdempotentConsumerTest.java}

Using the Spring XML Extensions

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