https://bz.apache.org/bugzilla/show_bug.cgi?id=62123
Bug ID: 62123
Summary: concurrentmodification exception on cleanup of RMI
objects when stopping webapp
Product: Tomcat 9
Version: 9.0.4
Hardware: PC
Status: NEW
Severity: normal
Priority: P2
Component: Catalina
Assignee: [email protected]
Reporter: [email protected]
Target Milestone: -----
Receive this exception occasionally when shutting down tomcat when webapp has
left RMI objects in memory. Does not always happen.
Similar to issue 31334, but different stack.
21-Feb-2018 02:05:58.192 SEVERE [Catalina-startStop-2]
org.apache.catalina.core.ContainerBase.stopInternal A child container failed
during stop
java.util.concurrent.ExecutionException:
org.apache.catalina.LifecycleException: Failed to stop component
[WebappLoader[StandardEngine[Catalina].StandardHost[localhost].StandardContext[]]]
at java.util.concurrent.FutureTask.report(FutureTask.java:122)
at java.util.concurrent.FutureTask.get(FutureTask.java:192)
at
org.apache.catalina.core.ContainerBase.stopInternal(ContainerBase.java:1003)
at
org.apache.catalina.util.LifecycleBase.stop(LifecycleBase.java:257)
at
org.apache.catalina.core.ContainerBase$StopChild.call(ContainerBase.java:1441)
at
org.apache.catalina.core.ContainerBase$StopChild.call(ContainerBase.java:1430)
at java.util.concurrent.FutureTask.run(FutureTask.java:266)
at
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
at
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
at java.lang.Thread.run(Thread.java:745)
Caused by: org.apache.catalina.LifecycleException: Failed to stop component
[WebappLoader[StandardEngine[Catalina].StandardHost[localhost].StandardContext[]]]
at
org.apache.catalina.util.LifecycleBase.handleSubClassException(LifecycleBase.java:441)
at
org.apache.catalina.util.LifecycleBase.stop(LifecycleBase.java:267)
at
org.apache.catalina.core.StandardContext.stopInternal(StandardContext.java:5363)
at
org.apache.catalina.util.LifecycleBase.stop(LifecycleBase.java:257)
at
org.apache.catalina.core.ContainerBase$StopChild.call(ContainerBase.java:1441)
at
org.apache.catalina.core.ContainerBase$StopChild.call(ContainerBase.java:1430)
at java.util.concurrent.FutureTask.run(FutureTask.java:266)
at
org.apache.tomcat.util.threads.InlineExecutorService.execute(InlineExecutorService.java:75)
at
java.util.concurrent.AbstractExecutorService.submit(AbstractExecutorService.java:134)
at
org.apache.catalina.core.ContainerBase.stopInternal(ContainerBase.java:997)
... 7 more
Caused by: java.util.ConcurrentModificationException
at java.util.HashMap$HashIterator.nextNode(HashMap.java:1437)
at java.util.HashMap$ValueIterator.next(HashMap.java:1466)
at
org.apache.catalina.loader.WebappClassLoaderBase.clearReferencesRmiTargets(WebappClassLoaderBase.java:2081)
at
org.apache.catalina.loader.WebappClassLoaderBase.clearReferences(WebappClassLoaderBase.java:1521)
at
org.apache.catalina.loader.WebappClassLoaderBase.stop(WebappClassLoaderBase.java:1463)
at
org.apache.catalina.loader.WebappLoader.stopInternal(WebappLoader.java:443)
at
org.apache.catalina.util.LifecycleBase.stop(LifecycleBase.java:257)
... 15 more
21-Feb-2018 02:05:58.193 SEVERE [Thread-115]
org.apache.catalina.core.ContainerBase.stopInternal A child container failed
during stop
java.util.concurrent.ExecutionException:
org.apache.catalina.LifecycleException: A child container failed during stop
at java.util.concurrent.FutureTask.report(FutureTask.java:122)
at java.util.concurrent.FutureTask.get(FutureTask.java:192)
at
org.apache.catalina.core.ContainerBase.stopInternal(ContainerBase.java:1003)
at
org.apache.catalina.util.LifecycleBase.stop(LifecycleBase.java:257)
at
org.apache.catalina.core.StandardService.stopInternal(StandardService.java:471)
at
org.apache.catalina.util.LifecycleBase.stop(LifecycleBase.java:257)
at
org.apache.catalina.core.StandardServer.stopInternal(StandardServer.java:791)
at
org.apache.catalina.util.LifecycleBase.stop(LifecycleBase.java:257)
at org.apache.catalina.startup.Catalina.stop(Catalina.java:744)
at
org.apache.catalina.startup.Catalina$CatalinaShutdownHook.run(Catalina.java:845)
Caused by: org.apache.catalina.LifecycleException: A child container failed
during stop
at
org.apache.catalina.core.ContainerBase.stopInternal(ContainerBase.java:1011)
at
org.apache.catalina.util.LifecycleBase.stop(LifecycleBase.java:257)
at
org.apache.catalina.core.ContainerBase$StopChild.call(ContainerBase.java:1441)
at
org.apache.catalina.core.ContainerBase$StopChild.call(ContainerBase.java:1430)
at java.util.concurrent.FutureTask.run(FutureTask.java:266)
at
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
at
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
at java.lang.Thread.run(Thread.java:745)
21-Feb-2018 02:05:58.195 SEVERE [Thread-115]
org.apache.catalina.startup.Catalina.stop Catalina.stop
org.apache.catalina.LifecycleException: A child container failed during stop
at
org.apache.catalina.core.ContainerBase.stopInternal(ContainerBase.java:1011)
at
org.apache.catalina.util.LifecycleBase.stop(LifecycleBase.java:257)
at
org.apache.catalina.core.StandardService.stopInternal(StandardService.java:471)
at
org.apache.catalina.util.LifecycleBase.stop(LifecycleBase.java:257)
at
org.apache.catalina.core.StandardServer.stopInternal(StandardServer.java:791)
at
org.apache.catalina.util.LifecycleBase.stop(LifecycleBase.java:257)
at org.apache.catalina.startup.Catalina.stop(Catalina.java:744)
at
org.apache.catalina.startup.Catalina$CatalinaShutdownHook.run(Catalina.java:845)
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