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From Claus Ibsen <claus.ib...@gmail.com>
Subject Re: onException: cannot get an exception object form exchange properties.
Date Thu, 11 Feb 2010 19:13:47 GMT
Hi

You can always put the caused exception to a Header as a String. The
JMS spec only allows a limited set of types to be used as JMS headers
(= JMS properties).

On Thu, Feb 11, 2010 at 2:58 PM, Nick Chistyakov <chikolad@gmail.com> wrote:
> Hello Claus,
>
> transferExchange=true will not work, I tracked it down to Exchange
> transformation to ActiveMQObjectMessage
>
> ActiveMQSession.java:
> 1671:  msg = (ActiveMQMessage)msg.copy();
>
> ActiveMQMessage.java
>
>   ....
>
>   public Message copy() {
>        ActiveMQMessage copy = new ActiveMQMessage();
>        copy(copy);
>        return copy;
>    }
>
>   will call:
>
>  ActiveMQObjectMessage.java
>
>   private void copy(ActiveMQObjectMessage copy) {
>        storeContent();
>        super.copy(copy);
>        copy.object = null;
>    }
>
> and actually this copy.object is a place where the exception is stored in
> properties.
> It will not be copied and that information will be lost.
>
> Best regards,
> Nick
>
>
> On Wed, Feb 10, 2010 at 11:38 PM, Claus Ibsen <claus.ibsen@gmail.com> wrote:
>
>> JMS only stores body + headers. Any properties and the likes are not
>> stored. Hence what you move to jms:errors in the Message body.
>> If you want to store the Exception as well you gotta serialize it and
>> store it as a header etc.
>>
>> You can try the transferExchange=true option on the JMS endpoint, then
>> Camel will store the entire Exchange including the Exception.
>> See more at the wiki page
>> http://camel.apache.org/jms.html
>>
>> On Wed, Feb 10, 2010 at 6:35 PM, Nick Chistyakov <chikolad@gmail.com>
>> wrote:
>> > Hello camel riders!
>> > I found a problem on getting an exception object out of exchange.
>> > If I declare a route like this:
>> > onException(Exception.class)
>> >                 .handled(true)
>> >                 .to("jms:errrors");
>> >
>> > Then, I should be able to write a code like this:
>> > Exchange e = consumer.receive("jms:errrors", 1000);
>> > and I can access an exception by:
>> > e.getProperty(Exchange.EXCEPTION_CAUGHT);
>> > The problem is that there is no exception object (null instead of it) in
>> > case when I run the system composed of set of modules
>> > that all have the route above to handle exceptions.
>> >
>> > The simple unit test, where everything is one context will pass. But will
>> > fail in more complicated cases.
>> > The exchange will contain a message that was not delivered but somehow it
>> > will miss any information about exception.
>> >
>> > If I modify my route :)
>> > onException(Exception.class)
>> >                 .onWhen(new Predicate() {
>> >                     @Override
>> >                     public boolean matches(Exchange exchange) {
>> >
>>  exchange.getIn().setBody(exchange.getException());
>> >                         return true;
>> >                     }
>> >                 })
>> >                 .handled(true)
>> >                 .to("jms:errors");
>> > I will yet get it (instead of original message body though)
>> >
>> > Where can I find a code that finally serializes the exchange and sends it
>> to
>> > destination?
>> > I tried to debug it but I'm not o experienced in camel internals, so I
>> > didn't find it.
>> > I would like to track what is going on.
>> > To make my point 100% clear I provided a small test project.
>> > It's a maven project  so anyone can easily run it.
>> > It contains a Router and 2 test:
>> > OnExceptionGreenTest and
>> > OnExceptionRedTest
>> > one is passing one is not.
>> > Best regards,
>> > Nick
>>
>>
>>
>> --
>> Claus Ibsen
>> Apache Camel Committer
>>
>> Author of Camel in Action: http://www.manning.com/ibsen/
>> Open Source Integration: http://fusesource.com
>> Blog: http://davsclaus.blogspot.com/
>> Twitter: http://twitter.com/davsclaus
>>
>



-- 
Claus Ibsen
Apache Camel Committer

Author of Camel in Action: http://www.manning.com/ibsen/
Open Source Integration: http://fusesource.com
Blog: http://davsclaus.blogspot.com/
Twitter: http://twitter.com/davsclaus

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