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https://issues.apache.org/activemq/browse/CAMEL-927?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=46005#action_46005
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Vadim Chekan commented on CAMEL-927:
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Well, I filed this bug not because I worry about selseless combo from().from();
but because I see some inconsistency in error handling.
In case of "from();" there is the same exception happen internally. A processor
tries to call the next processor withing the chain and fails with NPE. This
exception is intercepted and message is marked as "failed". But you can not see
anything wrong logged to the console. But in case of double inputs, exception
becomes visible.
So I suspect that actually "from.from" produces correct behavior when "from"
hides an error.
I don't think that "from.from" is totally bogus. Lets say we want to drain some
data source and we are not interested in the result.
Am I right that processes shoud call this.proceed instead of calling next
processor in the chain explicitly? Anyway, my concern is invisible exception in
the single "from" case. There is still NPE happening, why I can't see it in the
output?
> Double input without output produce exception
> ---------------------------------------------
>
> Key: CAMEL-927
> URL: https://issues.apache.org/activemq/browse/CAMEL-927
> Project: Apache Camel
> Issue Type: Bug
> Components: camel-core
> Affects Versions: 1.5.0
> Reporter: Vadim Chekan
> Priority: Minor
>
> Turn trace on.
> Run this route:
> from("timer://kickoff_1?period=10000&delay=1");
> As expected there is output from Trace Interceptor every 10 sec.
> Now run this route:
> from("timer://kickoff_1?period=10000&delay=1").
> from("timer://kickoff_2?period=10000&delay=2");
> You will get exception:
> 2008-09-22 06:03:01,871 [d=10000&delay=2] INFO TraceInterceptor
> - ID-ubuntu/50540-1222063381751/2-1 -> interceptor1
> Interceptor[Delegate(null)] InOnly
> Properties:{org.apache.camel.timer.name=kickoff_2,
> org.apache.camel.timer.firedTime=Mon Sep 22 06:03:01 GMT 2008,
> org.apache.camel.timer.period=10000} Headers:{firedTime=Mon Sep 22 06:03:01
> GMT 2008} BodyType:null Body:Message: null
> 2008-09-22 06:03:01,872 [d=10000&delay=2] ERROR DeadLetterChannel
> - Failed delivery for exchangeId: ID-ubuntu/50540-1222063381751/0-0. On
> delivery attempt: 0 caught: java.lang.NullPointerException
> java.lang.NullPointerException
> at
> org.apache.camel.management.InstrumentationProcessor.process(InstrumentationProcessor.java:69)
> at
> org.apache.camel.util.AsyncProcessorHelper.process(AsyncProcessorHelper.java:41)
> at
> org.apache.camel.management.InstrumentationProcessor.process(InstrumentationProcessor.java:50)
> at
> org.apache.camel.processor.DelegateProcessor.processNext(DelegateProcessor.java:50)
> at
> org.apache.camel.processor.DelegateProcessor.proceed(DelegateProcessor.java:79)
> at
> org.apache.camel.processor.interceptor.TraceInterceptor.process(TraceInterceptor.java:67)
> at
> org.apache.camel.management.InstrumentationProcessor.process(InstrumentationProcessor.java:69)
> at
> org.apache.camel.processor.DeadLetterChannel.process(DeadLetterChannel.java:174)
> at
> org.apache.camel.processor.DeadLetterChannel.process(DeadLetterChannel.java:96)
> at
> org.apache.camel.management.InstrumentationProcessor.process(InstrumentationProcessor.java:57)
> at
> org.apache.camel.util.AsyncProcessorHelper.process(AsyncProcessorHelper.java:41)
> at
> org.apache.camel.management.InstrumentationProcessor.process(InstrumentationProcessor.java:50)
> at
> org.apache.camel.processor.DelegateProcessor.processNext(DelegateProcessor.java:50)
> at
> org.apache.camel.processor.DelegateProcessor.proceed(DelegateProcessor.java:79)
> at
> org.apache.camel.processor.interceptor.TraceInterceptor.process(TraceInterceptor.java:67)
> at
> org.apache.camel.impl.converter.AsyncProcessorTypeConverter$ProcessorToAsyncProcessorBridge.process(AsyncProcessorTypeConverter.java:43)
> at
> org.apache.camel.processor.UnitOfWorkProcessor.process(UnitOfWorkProcessor.java:39)
> at
> org.apache.camel.util.AsyncProcessorHelper.process(AsyncProcessorHelper.java:41)
> at
> org.apache.camel.processor.DelegateAsyncProcessor.process(DelegateAsyncProcessor.java:66)
> at
> org.apache.camel.component.timer.TimerConsumer.sendTimerExchange(TimerConsumer.java:98)
> at
> org.apache.camel.component.timer.TimerConsumer$1.run(TimerConsumer.java:49)
> at java.util.TimerThread.mainLoop(Timer.java:512)
> at java.util.TimerThread.run(Timer.java:462)
> Why single input works fine and two produce an exception?
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