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From "Hadrian Zbarcea (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (CAMEL-4022) Issue using errorBuilderRef with the xml dsl
Date Fri, 27 May 2011 14:14:47 GMT

    [ https://issues.apache.org/jira/browse/CAMEL-4022?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13040246#comment-13040246
] 

Hadrian Zbarcea commented on CAMEL-4022:
----------------------------------------

@Claus, thanks for the input. That's the issue, what if I don't want handled(true) and to("direct:someRoute")
fails?

For the situation you mention where there is an onException handling the exception thrown
while handling, that should *not* trigger. That is only meant for exceptions thrown on the
route, not while handling. I believe exception thrown while handling have a special status
and should be handled differently, in a simple, predictable way, not by the ErrorHandler configured
for the route.

We need to come up with a good convention.

> Issue using errorBuilderRef with the xml dsl
> --------------------------------------------
>
>                 Key: CAMEL-4022
>                 URL: https://issues.apache.org/jira/browse/CAMEL-4022
>             Project: Camel
>          Issue Type: Bug
>    Affects Versions: 2.7.1
>            Reporter: Hadrian Zbarcea
>            Assignee: Hadrian Zbarcea
>
> While fixing issues around the errorHandler I noticed that <onException> definitions
defined in the camel context are ignored if a route specifies its own errorHandlerRef. The
reason is that we set the onException definition on the default error handler. I have a fix
for that, but I discovered a different issue (I think) for which I would like to discuss the
solution.
> When we have an onException definition that looks kinda like this:
> {code}
> <onException>
>   <exception> java.lang.IllegalArgumentException</exception>
>   <to uri="mock:illegalArgumentException"/>
> </onException>
> {code}
> ... something happens, the IAE exception is caught, we do something, but in that process
another exception is thrown. Currently, that would be caught by the default error handler,
which may not be what we want.
> What error handler (if any) should handle exceptions thrown while in onException?
> The onException mechanism is somewhat similar to a try/catch. I don't think the exceptions
thrown while handling onException should be handled by the same error handler configured for
the route, or even the context scoped one. The processing should be very simple, predictable
and immutable. Since the default "CamelDefaultErrorHandlerBuilder" can be replaced, it is
not imho a solution and we need one global one that does as little as possible (the problem
would be agreeing what that is: no redeliveries, logging or not, etc).
> Thoughts?

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