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https://issues.apache.org/jira/browse/CAMEL-12264?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16409420#comment-16409420
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Claus Ibsen commented on CAMEL-12264:
-------------------------------------
Can you tell more about your application and what you do, eg where do you use
that onCompletion and what Camel components are used on the consumer etc. And
how high is your high load
> Concurrent modification in safeCopyProperties Method of DefaultExchange
> -----------------------------------------------------------------------
>
> Key: CAMEL-12264
> URL: https://issues.apache.org/jira/browse/CAMEL-12264
> Project: Camel
> Issue Type: Bug
> Components: camel-core
> Affects Versions: 2.20.2
> Reporter: Yifan Wu
> Priority: Minor
>
> {color:#ffc66d}{color:#333333}safeCopyProperties method of DefaultExchange
> class,{color} {color}
> {code:java}
> // new LinkedList<>(Collection c) is not thread-safe.
> answer.put(Exchange.MESSAGE_HISTORY, new LinkedList<>(history));
> {code}
> new LinkedList<>(Collection c) is not thread-safe. Quote from LinkedList
> implementation "The behavior of this operation is undefined if{color:#629755}
> the specified collection is modified while the operation is
> in{color}{color:#629755} progress."{color}
>
> {color:#333333}In our case, when we have high throughput, we see the
> following exception (when the history is concurrently being modified.):{color}
> {color:#333333}java.lang.ArrayIndexOutOfBoundsException: 19
> at java.util.LinkedList.toArray(LinkedList.java:1053)
> at java.util.LinkedList.addAll(LinkedList.java:408)
> at java.util.LinkedList.addAll(LinkedList.java:387)
> at java.util.LinkedList.<init>(LinkedList.java:119)
> at
> org.apache.camel.impl.DefaultExchange.safeCopyProperties(DefaultExchange.java:152)
> at
> org.apache.camel.impl.DefaultExchange.copy(DefaultExchange.java:97)
> at
> org.apache.camel.util.ExchangeHelper.createCorrelatedCopy(ExchangeHelper.java:235)
> at
> org.apache.camel.util.ExchangeHelper.createCorrelatedCopy(ExchangeHelper.java:218)
> at
> org.apache.camel.processor.OnCompletionProcessor.prepareExchange(OnCompletionProcessor.java:190)
> at
> org.apache.camel.processor.OnCompletionProcessor$OnCompletionSynchronizationAfterConsumer.onComplete(OnCompletionProcessor.java:235)
> at
> org.apache.camel.util.UnitOfWorkHelper.doneSynchronizations(UnitOfWorkHelper.java:104)
> at
> org.apache.camel.impl.DefaultUnitOfWork.done(DefaultUnitOfWork.java:229)
> at
> org.apache.camel.util.UnitOfWorkHelper.doneUow(UnitOfWorkHelper.java:65){color}
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