https://issues.apache.org/bugzilla/show_bug.cgi?id=54906
Bug ID: 54906
Summary: WebappClassLoader.loadedByThisOrChild can throw
ConcurrentModificationException
Product: Tomcat 8
Version: trunk
Hardware: PC
OS: Linux
Status: NEW
Severity: enhancement
Priority: P2
Component: Catalina
Assignee: [email protected]
Reporter: [email protected]
Classification: Unclassified
Created attachment 30240
--> https://issues.apache.org/bugzilla/attachment.cgi?id=30240&action=edit
Patch to catch ConcurrentModificationException while iterating over a
collection
This is related to bug 54497. A common exception seen in 7.0.33 during stop is
a ConcurrentModification in loadedByThisOrChild.
java.util.concurrent.ExecutionException:
org.apache.catalina.LifecycleException: Failed to stop component
[StandardEngine[Tomcat].StandardHost[localhost].StandardContext[/mobile/login/oauth]]
at java.util.concurrent.FutureTask$Sync.innerGet(FutureTask.java:252)
at java.util.concurrent.FutureTask.get(FutureTask.java:111)
at
org.apache.catalina.core.ContainerBase.stopInternal(ContainerBase.java:1179)
at org.apache.catalina.util.LifecycleBase.stop(LifecycleBase.java:232)
at
org.apache.catalina.core.ContainerBase$StopChild.call(ContainerBase.java:1575)
at
org.apache.catalina.core.ContainerBase$StopChild.call(ContainerBase.java:1564)
at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:334)
at java.util.concurrent.FutureTask.run(FutureTask.java:166)
at
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
at
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
at java.lang.Thread.run(Thread.java:722)
Caused by: org.apache.catalina.LifecycleException: Failed to stop component
[StandardEngine[Tomcat].StandardHost[localhost].StandardContext[/mobile/login/oauth]]
at org.apache.catalina.util.LifecycleBase.stop(LifecycleBase.java:236)
... 7 more
Caused by: org.apache.catalina.LifecycleException: Failed to stop component
[WebappLoader[/mobile/login/oauth]]
at org.apache.catalina.util.LifecycleBase.stop(LifecycleBase.java:236)
at
org.apache.catalina.core.StandardContext.stopInternal(StandardContext.java:5521)
at org.apache.catalina.util.LifecycleBase.stop(LifecycleBase.java:232)
... 7 more
Caused by: java.util.ConcurrentModificationException
at java.util.Vector$Itr.checkForComodification(Vector.java:1156)
at java.util.Vector$Itr.next(Vector.java:1133)
at
org.apache.catalina.loader.WebappClassLoader.loadedByThisOrChild(WebappClassLoader.java:2599)
at
org.apache.catalina.loader.WebappClassLoader.checkThreadLocalMapForLeaks(WebappClassLoader.java:2515)
at
org.apache.catalina.loader.WebappClassLoader.checkThreadLocalsForLeaks(WebappClassLoader.java:2455)
at
org.apache.catalina.loader.WebappClassLoader.clearReferences(WebappClassLoader.java:1996)
at
org.apache.catalina.loader.WebappClassLoader.stop(WebappClassLoader.java:1902)
at
org.apache.catalina.loader.WebappLoader.stopInternal(WebappLoader.java:661)
at org.apache.catalina.util.LifecycleBase.stop(LifecycleBase.java:232)
... 9 more
The fix for 54497 stops the exception from failing the stop but it still fails
the rest of the ThreadLocal leak check. It would be better if
ConcurrentModificationException was caught in loadedByThisOrChild and only that
one check fails.
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