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• maximumRedeliveries=0
• redeliverDelay=1000L (1 second)
• maximumRedeliveryDelay = 60 * 1000L (60 seconds)
• And the exponential backoff and collision avoidance is turned off.
• The retriesExhaustedLogLevel are set to LoggingLevel.ERROR
• The retryAttemptedLogLevel are set to LoggingLevel.DEBUG
• Stack traces is logged for exhausted messages from Camel 2.2 onwards.
• Handled exceptions is not logged from Camel 2.3 onwards
• logExhaustedMessageHistory is true for default error handler, and false for dead letter channel.
• logExhaustedMessageBody Camel 2.17: is disabled by default to avoid logging sensitive message body/header details. If this option is true, then logExhaustedMessageHistory must also be true.

The maximum redeliver delay ensures that a delay is never longer than the value, default 1 minute. This can happen if you turn on the exponential backoff.

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The default value is true to be backwards compatible as before. For example the following sample shows how to do this with Java DSL and XML DSL

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

{snippet:id=e1|lang=xml|url=camel/trunk/components/camel-spring/src/test/resources/org/apache/camel/spring/processor/SpringRedeliveryErrorHandlerNoRedeliveryOnShutdownTest.xml}

Samples

The following example shows how to configure the Dead Letter Channel configuration using the DSL

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

{snippet:id=e4|lang=java|url=camel/trunk/camel-core/src/test/java/org/apache/camel/builder/ErrorHandlerTest.java}

How can I modify the Exchange before redelivery?

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Here we configure the Dead Letter Channel to use our processor MyRedeliveryProcessor to be executed before each redelivery.

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

{snippet:id=e2|lang=java|url=camel/trunk/camel-core/src/test/java/org/apache/camel/processor/DeadLetterChannelOnRedeliveryTest.java}

How can I log what caused the Dead Letter Channel to be invoked?

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