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https://issues.apache.org/jira/browse/CAMEL-4447?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13104504#comment-13104504
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Willem Jiang commented on CAMEL-4447:
-------------------------------------
Camel 2.8.1 is promoted to the maven central repo two days ago, you can try it
now :)
> thread safety issue with Exchange.getUnitOfWork()
> -------------------------------------------------
>
> Key: CAMEL-4447
> URL: https://issues.apache.org/jira/browse/CAMEL-4447
> Project: Camel
> Issue Type: Bug
> Components: camel-core
> Affects Versions: 2.8.1
> Environment: JDK 1.6.0_20 on Linux x86_64
> Reporter: David Tombs
>
> I'm having a somewhat rare issue with NullPointerExceptions in a
> multithreaded route. It seems that there is a race condition between one
> thread operating on the UnitOfWork and another removing it. I have gotten the
> following stacktraces so far:
> {noformat}
> ERROR [Camel0 - Resequencer Delivery] o.a.c.p.StreamResequencer - Caused by:
> [java.lang.NullPointerException - null]
> java.lang.NullPointerException: null
> at
> org.apache.camel.processor.DefaultChannel$1.done(DefaultChannel.java:309)
> ~[camel-core-2.8.1-SNAPSHOT.jar:2.8.1-SNAPSHOT]
> at
> org.apache.camel.processor.RedeliveryErrorHandler.processErrorHandler(RedeliveryErrorHandler.java:349)
> ~[camel-core-2.8.1-SNAPSHOT.jar:2.8.1-SNAPSHOT]
> at
> org.apache.camel.processor.RedeliveryErrorHandler.process(RedeliveryErrorHandler.java:209)
> ~[camel-core-2.8.1-SNAPSHOT.jar:2.8.1-SNAPSHOT]
> at
> org.apache.camel.processor.DefaultChannel.process(DefaultChannel.java:305)
> ~[camel-core-2.8.1-SNAPSHOT.jar:2.8.1-SNAPSHOT]
> at
> org.apache.camel.util.AsyncProcessorHelper.process(AsyncProcessorHelper.java:78)
> ~[camel-core-2.8.1-SNAPSHOT.jar:2.8.1-SNAPSHOT]
> at org.apache.camel.processor.Pipeline.process(Pipeline.java:116)
> ~[camel-core-2.8.1-SNAPSHOT.jar:2.8.1-SNAPSHOT]
> at org.apache.camel.processor.Pipeline.process(Pipeline.java:79)
> ~[camel-core-2.8.1-SNAPSHOT.jar:2.8.1-SNAPSHOT]
> at
> org.apache.camel.util.AsyncProcessorHelper.process(AsyncProcessorHelper.java:104)
> ~[camel-core-2.8.1-SNAPSHOT.jar:2.8.1-SNAPSHOT]
> at org.apache.camel.processor.Pipeline.process(Pipeline.java:59)
> ~[camel-core-2.8.1-SNAPSHOT.jar:2.8.1-SNAPSHOT]
> at
> org.apache.camel.processor.StreamResequencer.sendElement(StreamResequencer.java:165)
> ~[camel-core-2.8.1-SNAPSHOT.jar:2.8.1-SNAPSHOT]
> at
> org.apache.camel.processor.StreamResequencer.sendElement(StreamResequencer.java:61)
> ~[camel-core-2.8.1-SNAPSHOT.jar:2.8.1-SNAPSHOT]
> at
> org.apache.camel.processor.resequencer.ResequencerEngine.deliverNext(ResequencerEngine.java:254)
> ~[camel-core-2.8.1-SNAPSHOT.jar:2.8.1-SNAPSHOT]
> at
> org.apache.camel.processor.resequencer.ResequencerEngine.deliver(ResequencerEngine.java:218)
> ~[camel-core-2.8.1-SNAPSHOT.jar:2.8.1-SNAPSHOT]
> at
> org.apache.camel.processor.StreamResequencer$Delivery.run(StreamResequencer.java:212)
> ~[camel-core-2.8.1-SNAPSHOT.jar:2.8.1-SNAPSHOT]
> {noformat}
> And:
> {noformat}
> ERROR [Camel0 - Resequencer Delivery] o.a.c.p.StreamResequencer - Caused by:
> [java.lang.NullPointerException - null]
> java.lang.NullPointerException: null
> at
> org.apache.camel.impl.DefaultExchange.isTransacted(DefaultExchange.java:331)
> ~[camel-core-2.8.1-SNAPSHOT.jar:2.8.1-SNAPSHOT]
> at
> org.apache.camel.util.AsyncProcessorHelper.process(AsyncProcessorHelper.java:57)
> ~[camel-core-2.8.1-SNAPSHOT.jar:2.8.1-SNAPSHOT]
> at org.apache.camel.processor.Pipeline.process(Pipeline.java:116)
> ~[camel-core-2.8.1-SNAPSHOT.jar:2.8.1-SNAPSHOT]
> at org.apache.camel.processor.Pipeline.process(Pipeline.java:79)
> ~[camel-core-2.8.1-SNAPSHOT.jar:2.8.1-SNAPSHOT]
> at
> org.apache.camel.util.AsyncProcessorHelper.process(AsyncProcessorHelper.java:104)
> ~[camel-core-2.8.1-SNAPSHOT.jar:2.8.1-SNAPSHOT]
> at org.apache.camel.processor.Pipeline.process(Pipeline.java:59)
> ~[camel-core-2.8.1-SNAPSHOT.jar:2.8.1-SNAPSHOT]
> at
> org.apache.camel.processor.StreamResequencer.sendElement(StreamResequencer.java:165)
> ~[camel-core-2.8.1-SNAPSHOT.jar:2.8.1-SNAPSHOT]
> at
> org.apache.camel.processor.StreamResequencer.sendElement(StreamResequencer.java:61)
> ~[camel-core-2.8.1-SNAPSHOT.jar:2.8.1-SNAPSHOT]
> at
> org.apache.camel.processor.resequencer.ResequencerEngine.deliverNext(ResequencerEngine.java:254)
> ~[camel-core-2.8.1-SNAPSHOT.jar:2.8.1-SNAPSHOT]
> at
> org.apache.camel.processor.resequencer.ResequencerEngine.deliver(ResequencerEngine.java:218)
> ~[camel-core-2.8.1-SNAPSHOT.jar:2.8.1-SNAPSHOT]
> at
> org.apache.camel.processor.StreamResequencer$Delivery.run(StreamResequencer.java:212)
> ~[camel-core-2.8.1-SNAPSHOT.jar:2.8.1-SNAPSHOT]
> {noformat}
> Looking at the source, both NullPointerExceptions were thrown by code like:
> {code}
> return getUnitOfWork() != null && getUnitOfWork().isTransacted();
> {code}
> Oddly, I've only seen this happen soon after startup and only once per run.
> The actual route is company confidential, but it's basically:
> JMS -> Stream Resequencer -> Bean
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