Hi Yeah error handling and redelivery is hard.
1) onRedelivery is *only* executed when Camel performs a redelivery attempt. That is it retries processing some exchange that failed last time. 2) onException will by default not do any redelivery attempts, unless you set a maximumRedelivers option >= 1. So in your first attempt Camel will by the onException catch the RuntimeException and *not do any redeliveries* as maximumRedelivers is by default = 0 for onException. So when you change the maximumRedeliveries = 1 then the onRedelivery processor kicks in as expected. onRedelivery is meant to allow you to do a bit of custom message adjustment before Camel retries. And yes it can also be used for logging. On Wed, May 27, 2009 at 4:32 PM, mta38 <[email protected]> wrote: > > Hi all, > > I play with Exception, ErrorHandler and redelivery (Camel 2.0-M1) and there > are some things that I can't understand :confused:. > > snippet code > > <bean id="globalDeadLetterChannel" > class="org.apache.camel.builder.DeadLetterChannelBuilder"> > <property name="defaultDeadLetterEndpointUri" > value="direct:response"/> > <property name="onRedelivery" ref="routeRedelivery"/> > <property name="redeliveryPolicy"> > <bean id="redeliveryPolicyConfig" > class="org.apache.camel.processor.RedeliveryPolicy"> > <property name="maximumRedeliveries" value="1"/> > </bean> > </property> > </bean> > > <camelContext id="camelContext" errorHandlerRef="globalDeadLetterChannel" > xmlns="http://camel.apache.org/schema/spring";> > > <onException > > <exception>java.lang.RuntimeException</exception> > <handled> > <constant>true</constant> > </handled> > <to uri="direct:response" /> > </onException> > > … other routes … > > </camelContext> > > routeRedelivery bean is a processor which make some trace in a log file. > > When I raise a runtimeException, the process method of routeRedelivery bean > is not called. I can't understand why, since onRedelivery property is > defined for my global dead letter channel. > > If I modify onException element like following: > > > <onException onRedeliveryRef="routeRedelivery"> > <exception>java.lang.RuntimeException</exception> > <redeliveryPolicy maximumRedeliveries="1"/> > <handled> > <constant>true</constant> > </handled> > <to uri="direct:response" /> > </onException> > > > And I raised a RuntimeException, I have some trace in my log file that > proves that process method of routeRedelivery bean is called. > > Is someone can explain me why onRedelivery processor is not called when it's > defined in global scope will be appreciated. > Best regards, > Mta38 > > -- > View this message in context: > http://www.nabble.com/Exception%2C-ErrorHandler-and-redelivery-tp23743717p23743717.html > Sent from the Camel - Users mailing list archive at Nabble.com. > > -- Claus Ibsen Apache Camel Committer Open Source Integration: http://fusesource.com Blog: http://davsclaus.blogspot.com/ Twitter: http://twitter.com/davsclaus
