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Tomcat Shutdown & TimerThread leak? [message #1759550]

Wed, 12 April 2017 17:40

Eclipse User

Hi,

I am using BIRT (4.4.1) with Tomcat (8.0.27). When I undeploy my app (or shutdown tomcat) I get the following warning.

WARNING: The web application [server] appears to have started a thread named [Timer-0] but has failed to stop it. This is very likely to create a memory leak. Stack trace of thread:
java.lang.Object.wait(Native Method)
java.util.TimerThread.mainLoop(Unknown Source)
java.util.TimerThread.run(Unknown Source)

I am shutting down the BIRT engine when the context is destroyed as follows:
birtEngine.destroy();
Platform.shutdown();

I think I tracked the problem down to a Timer thread created in the org.eclipse.birt.data.engine.executor.CacheIDFetcher class:

private CacheIDFetcher ()
{
	this.activeCacheIDs = new java.util.concurrent.ConcurrentHashMap<String, Long>( );
	Timer timer = new Timer( true );
	TimerTask task = new CacheIDPurgeTimeTask( );
	timer.schedule( task, 0, idleTime );
}

There seems to be no way to access or cancel this timer thread. Thoughts?

Thanks,
Emily

Re: Tomcat Shutdown & TimerThread leak? [message #1769949 is a reply to message #1759550]

Sun, 06 August 2017 19:24

Eclipse User

Hi Emily,

I'm facing the same issue. Did you manage to resolve it?

Thanks.

Re: Tomcat Shutdown & TimerThread leak? [message #1770281 is a reply to message #1769949]

Wed, 09 August 2017 11:30

Eclipse User

No. We just ended up making it a policy to shutdown & restart tomcat.

Re: Tomcat Shutdown & TimerThread leak? [message #1790931 is a reply to message #1770281]

Wed, 20 June 2018 06:29

Eclipse User

I have the same issue.
BIRT (4.7) with Tomcat (8.5).

org.apache.catalina.loader.WebappClassLoaderBase.clearReferencesThreads The web application [probe] appears to have started a thread named [Probe_Quartz-5] but has failed to stop it. This is very likely to create a memory leak. Stack trace of thread:
java.lang.Object.wait(Native Method)
org.quartz.simpl.SimpleThreadPool$WorkerThread.run(SimpleThreadPool.java:568)

Re: Tomcat Shutdown & TimerThread leak? [message #1794777 is a reply to message #1759550]

Thu, 06 September 2018 07:30

Eclipse User

We are also facing same issue wherein this timer thread can not be stopped and after many deploy/undeploy cycles on server, there will be many threads and they will not allow to GC the classloader eventually filling up the permgen/metaspace and causing Out Of Memory.

Is there any fix available for this issue now?

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