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From "Claus Ibsen (JIRA)" <j...@apache.org>
Subject [jira] [Resolved] (CAMEL-6941) ConcurrentModificationException while shutting down camel
Date Fri, 08 Nov 2013 14:53:17 GMT

     [ https://issues.apache.org/jira/browse/CAMEL-6941?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Claus Ibsen resolved CAMEL-6941.
--------------------------------

    Resolution: Fixed

> ConcurrentModificationException while shutting down camel
> ---------------------------------------------------------
>
>                 Key: CAMEL-6941
>                 URL: https://issues.apache.org/jira/browse/CAMEL-6941
>             Project: Camel
>          Issue Type: Bug
>          Components: camel-core
>    Affects Versions: 2.11.0
>         Environment: jdk-1.7.0_45
>            Reporter: Robin Kåveland Hansen
>            Assignee: Claus Ibsen
>            Priority: Minor
>             Fix For: 2.11.3, 2.12.2, 2.13.0
>
>
> Observed the following stacktrace while shutting down camel:
> {code}
>    org.apache.camel.impl.DefaultExecutorServiceManager.awaitTermination()#401: Waited
4.017 seconds for ExecutorService: java.util.concurrent.ThreadPoolExecutor@33c4bcda to terminate...
>    org.apache.camel.impl.DefaultExecutorServiceManager.awaitTermination()#401: Waited
6.027 seconds for ExecutorService: java.util.concurrent.ThreadPoolExecutor@33c4bcda to terminate...
>    org.apache.camel.impl.DefaultExecutorServiceManager.awaitTermination()#401: Waited
8.037 seconds for ExecutorService: java.util.concurrent.ThreadPoolExecutor@33c4bcda to terminate...
>    org.apache.camel.impl.DefaultExecutorServiceManager.awaitTermination()#401: Waited
10.008 seconds for ExecutorService: java.util.concurrent.ThreadPoolExecutor@33c4bcda to terminate...
> g   org.apache.camel.impl.DefaultExecutorServiceManager.doShutdown()#301: Forcing shutdown
of ExecutorService: java.util.concurrent.ThreadPoolExecutor@33c4bcda due first await termination
elapsed.
>    org.apache.camel.impl.DefaultExecutorServiceManager.awaitTermination()#401: Waited
2.008 seconds for ExecutorService: java.util.concurrent.ThreadPoolExecutor@33c4bcda to terminate...
>    org.apache.camel.impl.DefaultExecutorServiceManager.awaitTermination()#401: Waited
4.018 seconds for ExecutorService: java.util.concurrent.ThreadPoolExecutor@33c4bcda to terminate...
>    org.apache.camel.impl.DefaultExecutorServiceManager.awaitTermination()#401: Waited
6.028 seconds for ExecutorService: java.util.concurrent.ThreadPoolExecutor@33c4bcda to terminate...
>    org.apache.camel.impl.DefaultExecutorServiceManager.awaitTermination()#401: Waited
8.039 seconds for ExecutorService: java.util.concurrent.ThreadPoolExecutor@33c4bcda to terminate...
>    org.apache.camel.impl.DefaultExecutorServiceManager.awaitTermination()#401: Waited
10.008 seconds for ExecutorService: java.util.concurrent.ThreadPoolExecutor@33c4bcda to terminate...
> g   org.apache.camel.impl.DefaultExecutorServiceManager.doShutdown()#305: Cannot completely
force shutdown of ExecutorService: java.util.concurrent.ThreadPoolExecutor@33c4bcda due second
await termination elapsed.
>    org.apache.camel.impl.DefaultExecutorServiceManager.doShutdown()#318: Shutdown of
ExecutorService: java.util.concurrent.ThreadPoolExecutor@33c4bcda is shutdown: true and terminated:
false took: 20.018 seconds.
> g   org.apache.camel.impl.DefaultCamelContext.shutdownServices()#1771: Error occurred
while shutting down service: org.apache.camel.impl.DefaultExecutorServiceManager@37285252.
This exception will be ignored.
> g   Caused by java.util.ConcurrentModificationException - null
> g      at java.util.AbstractList$Itr.checkForComodification(AbstractList.java:372)
> g      at java.util.AbstractList$Itr.next(AbstractList.java:343)
> g      at org.apache.camel.impl.DefaultExecutorServiceManager.doShutdown(DefaultExecutorServiceManager.java:442)
> g      at org.apache.camel.support.ServiceSupport.shutdown(ServiceSupport.java:158)
> g      at org.apache.camel.util.ServiceHelper.stopAndShutdownService(ServiceHelper.java:166)
> g      at org.apache.camel.impl.DefaultCamelContext.shutdownServices(DefaultCamelContext.java:1766)
> g      at org.apache.camel.impl.DefaultCamelContext.doStop(DefaultCamelContext.java:1681)
> g      at org.apache.camel.support.ServiceSupport.stop(ServiceSupport.java:92)
> g      at org.apache.camel.core.xml.AbstractCamelContextFactoryBean.destroy(AbstractCamelContextFactoryBean.java:432)
> g      at org.springframework.beans.factory.support.DisposableBeanAdapter.destroy(DisposableBeanAdapter.java:211)
> g      at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.destroyBean(DefaultSingletonBeanRegistry.java:500)
> g      at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.destroySingleton(DefaultSingletonBeanRegistry.java:476)
> g      at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.destroySingletons(DefaultSingletonBeanRegistry.java:445)
> g      at org.springframework.context.support.AbstractApplicationContext.destroyBeans(AbstractApplicationContext.java:1090)
> g      at org.springframework.context.support.AbstractApplicationContext.doClose(AbstractApplicationContext.java:1064)
> g      at org.springframework.context.support.AbstractApplicationContext.close(AbstractApplicationContext.java:1010)
> g      at org.apache.camel.spring.Main.doStop(Main.java:152)
> g      at org.apache.camel.support.ServiceSupport.stop(ServiceSupport.java:92)
> g      at org.apache.camel.main.MainSupport$HangupInterceptor.run(MainSupport.java:82)
>    org.apache.camel.impl.DefaultCamelContext.doStop()#1695: Uptime 35 days 23 hours
>    org.apache.camel.impl.DefaultCamelContext.doStop()#1696: Apache Camel 2.11.0 (CamelContext:
camel-activemq) is shutdown in 51.196 seconds
> {code}
> I haven't seen this before but it seems to me that there must be more than one thread
doing something to DefaultExecutorServiceManager.executorServices (ArrayList) at the same
time.



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