[jira] [Created] (CAMEL-15020) Improve FAQ: Why is the exception null when I use onException?

["Thomas Küstermann (Jira)" <ji...@apache.org>]

Thomas Küstermann created CAMEL-15020:
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             Summary: Improve FAQ: Why is the exception null when I use onException?
                 Key: CAMEL-15020
                 URL: https://issues.apache.org/jira/browse/CAMEL-15020
             Project: Camel
          Issue Type: Improvement
          Components: documentation
            Reporter: Thomas Küstermann


The FAQ article [Why is the exception null when I use onException?|https://camel.apache.org/manual/latest/faq/why-is-the-exception-null-when-i-use-onexception.html] states that {{exchange.getException()}} returns {{null}} if {{onException()}} is used in conjunction with {{handled(true)}}.

Whether it's handled or not, {{exchange.getException()}} return always {{null}} since the default error handling mechanism clears the exception already:

{code:java|title=RedeliveryErrorHandler.deliverToFailureProcessor() - Camel 2.25.0}
// we did not success with the redelivery so now we let the failure processor handle it
// clear exception as we let the failure processor handle it
exchange.setException(null);
{code}

I'm fairly new too Camel error handling, it would've been helpful in advance to know it.

References:

* [Exception in Exchange is null|https://camel.465427.n5.nabble.com/Exception-in-Exchange-is-null-td5717324.html]
* [Apache Camel: exchange.getException() vs CamelExceptionCaught property|https://stackoverflow.com/q/37422568/5006866]



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