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From Torgeir Veimo <torg...@netenviron.com>
Subject Re: ThreadLocal errors logged in Tomcat 6.0.24
Date Mon, 15 Feb 2010 12:11:23 GMT
On 15 February 2010 21:14, Rakesh Vidyadharan <rakesh@sptci.com> wrote:
> On 15 Feb 2010, at 02:42, Thomas Müller wrote:
>
>> Hi,
>>
>> It looks like the Jackrabbit repository is not closed when the web
>> application is stopped. Could you verify this?
>>
>> Regards,
>> Thomas
>
> I am using TransientRepository, and I verified that there are not .lock or .lck files
under repository root before I shutdown the container.  It appears to be primarily Derby
and Lucene that have these issues, so it may not be a JackRabbit issue per se.

There's at least one jackrabbit timer that doesn't shut down. Here's
what I see in the tomcat log, redeploying an app that uses
TransientRepository;

Feb 15, 2010 10:07:58 PM org.apache.catalina.loader.WebappClassLoader
clearReferencesThreads
SEVERE: A web application appears to have started a thread named
[Timer-2] but has failed to stop it. This is very likely to create a
memory leak.
Feb 15, 2010 10:07:58 PM org.apache.catalina.loader.WebappClassLoader
clearReferencesThreads
WARNING: Failed to terminate thread named [Timer-2]
java.lang.NoSuchFieldException: target
	at java.lang.Class.getDeclaredField(Class.java:1882)
	at org.apache.catalina.loader.WebappClassLoader.clearReferencesThreads(WebappClassLoader.java:1958)
	at org.apache.catalina.loader.WebappClassLoader.clearReferences(WebappClassLoader.java:1707)
	at org.apache.catalina.loader.WebappClassLoader.stop(WebappClassLoader.java:1622)
	at org.apache.catalina.loader.WebappLoader.stop(WebappLoader.java:710)
	at org.apache.catalina.core.StandardContext.stop(StandardContext.java:4649)
	at org.apache.catalina.core.ContainerBase.removeChild(ContainerBase.java:924)
	at org.apache.catalina.startup.HostConfig.checkResources(HostConfig.java:1121)
	at org.apache.catalina.startup.HostConfig.check(HostConfig.java:1342)
	at org.apache.catalina.startup.HostConfig.lifecycleEvent(HostConfig.java:303)
	at org.apache.catalina.util.LifecycleSupport.fireLifecycleEvent(LifecycleSupport.java:119)
	at org.apache.catalina.core.ContainerBase.backgroundProcess(ContainerBase.java:1337)
	at org.apache.catalina.core.ContainerBase$ContainerBackgroundProcessor.processChildren(ContainerBase.java:1601)
	at org.apache.catalina.core.ContainerBase$ContainerBackgroundProcessor.processChildren(ContainerBase.java:1610)
	at org.apache.catalina.core.ContainerBase$ContainerBackgroundProcessor.run(ContainerBase.java:1590)
	at java.lang.Thread.run(Thread.java:637)
Feb 15, 2010 10:07:58 PM org.apache.catalina.loader.WebappClassLoader
clearThreadLocalMap
SEVERE: A web application created a ThreadLocal with key of type
[java.lang.ThreadLocal] (value [java.lang.ThreadLocal@4fc0b204]) and a
value of type [org.apache.jackrabbit.core.query.lucene.PerQueryCache]
(value [org.apache.jackrabbit.core.query.lucene.PerQueryCache@73e74d83])
but failed to remove it when the web application was stopped. To
prevent a memory leak, the ThreadLocal has been forcibly removed.
Feb 15, 2010 10:07:58 PM org.apache.catalina.loader.WebappClassLoader
clearThreadLocalMap
SEVERE: A web application created a ThreadLocal with key of type
[java.lang.ThreadLocal] (value [java.lang.ThreadLocal@56920ee7]) and a
value of type [org.apache.derby.iapi.services.context.ContextManager]
(value [org.apache.derby.iapi.services.context.ContextManager@246972f1])
but failed to remove it when the web application was stopped. To
prevent a memory leak, the ThreadLocal has been forcibly removed.
Feb 15, 2010 10:07:58 PM org.apache.catalina.loader.WebappClassLoader
clearThreadLocalMap
SEVERE: A web application created a ThreadLocal with key of type
[org.apache.derby.iapi.sql.dictionary.TableDescriptor$1] (value
[org.apache.derby.iapi.sql.dictionary.TableDescriptor$1@f108c18]) and
a value of type [java.util.WeakHashMap] (value [{={1}, ={1, 2}, =null,
={1}, =null, ={1}, ={1}, =null, ={1}, =null, ={2, 3, 4}, ={1}, =null,
={1}, ={1}, ={1, 2}, =null, =null, =null, =null, =null, ={2, 3, 4},
={1}, =null, =null, =null}]) but failed to remove it when the web
application was stopped. To prevent a memory leak, the ThreadLocal has
been forcibly removed.

-- 
-Tor

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