Why dead letter channel doesn't work after adding Processor to onException?

[rafaljaw]

Hi all,

I have simple route that takes messages from [Input] and forwards them to
[Output], or to [Failed] (dead letter queue) if something bad happens:

    errorHandler(deadLetterChannel("jms:queue:Failed")
        .maximumRedeliveries(1)
        .redeliveryDelay(0));

    onException(Throwable.class)
        .maximumRedeliveries(0)
        .handled(true);

    from("jms:queue:Input")
        .process(new Processor() {
            @Override
            public void process(Exchange exchange) throws Exception {
                System.out.println("Processing msg " +
exchange.getIn().getBody());
                throw new RuntimeException("Something bad happens here...");
            }
        })
        .to("jms:queue:Output");

Everything works as expected - all messages are placed on [Failed] queue
since we are throwing RuntimeException in processor. But it doesn't work
after adding processor to onException:


    errorHandler(deadLetterChannel("jms:queue:Failed")
        .maximumRedeliveries(1)
        .redeliveryDelay(0));

    onException(Throwable.class)
        .maximumRedeliveries(0)
        .process(new Processor() {
            @Override
            public void process(Exchange exchange) throws Exception {
                System.out.println("Exception is intercepted...");
            }
        })
        .handled(true);

    from("jms:queue:Input")
        .process(new Processor() {
            @Override
            public void process(Exchange exchange) throws Exception {
                System.out.println("Processing msg " +
exchange.getIn().getBody());
                throw new RuntimeException("Something bad happens here...");
            }
        })
        .to("jms:queue:Output");

I'm loosing all messages now - why? Why adding processor to onException is
so special?
I'm using Camel 2.6 and ActiveMQ 5.8.0.

Regards,
Rafal



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