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Now suppose the route above and a failure happens in the foo bean. Then the Exchange.TO_ENDPOINT and Exchange.FAILURE_ENDPOINT will still contain the value of http://someserver/somepath.

OnPrepareFailure

Available as of Camel 2.16

Before the exchange is sent to the dead letter queue, you can use onPrepare to allow a custom Processor to prepare the exchange, such as adding information why the Exchange failed. For example the following processor adds a header with the exception message

    public static class MyPrepareProcessor implements Processor {
        @Override
        public void process(Exchange exchange) throws Exception {
            Exception cause = exchange.getProperty(Exchange.EXCEPTION_CAUGHT, Exception.class);
            exchange.getIn().setHeader("FailedBecause", cause.getMessage());
        }
    }

Then configure the error handler to use the processor as follows:

errorHandler(deadLetterChannel("jms:dead").onPrepareFailure(new MyPrepareProcessor()));

Configuring this from XML DSL is as shown:

  <bean id="myPrepare"
        class="org.apache.camel.processor.DeadLetterChannelOnPrepareTest.MyPrepareProcessor"/>


    <errorHandler id="dlc" type="DeadLetterChannel" deadLetterUri="jms:dead" onPrepareFailureRef="myPrepare"/>

The onPrepare is also available using the default error handler.

Which route failed

Available as of Camel 2.10.4/2.11

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