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Posted to dev@camel.apache.org by "David Tombs (JIRA)" <ji...@apache.org> on 2011/09/13 22:33:08 UTC
[jira] [Updated] (CAMEL-4447) thread safety issue with
Exchange.getUnitOfWork()
[ https://issues.apache.org/jira/browse/CAMEL-4447?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
David Tombs updated CAMEL-4447:
-------------------------------
Description:
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
was:
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:
{{
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]
}}
And:
{{
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]
}}
Looking at the source, both NullPointerExceptions were thrown by code like:
{{
return getUnitOfWork() != null && getUnitOfWork().isTransacted();
}}
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
> 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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