On Tomcat Shutdown: Memory Leak Warning

[Y Levine]

I don't think this is an item to be concerned about -- but not leaving any
stones upturned.

Has anyone else come across message below on Tomcat shutdown in
catalina.out? What did you do to fix it? Or ignore? Versions at email
tail-end.

Thanks.

catalina.out:

16-Dec-2016 16:35:35.956 INFO [main]
org.apache.catalina.core.StandardServer.await A valid shutdown command was
received via the shutdown port. Stopping the Server instance.
16-Dec-2016 16:35:35.957 INFO [main]
org.apache.coyote.AbstractProtocol.pause Pausing ProtocolHandler
["ajp-nio-127.0.0.1-8009"]
16-Dec-2016 16:35:36.010 INFO [main]
org.apache.catalina.core.StandardService.stopInternal Stopping service
Catalina
16-Dec-2016 16:35:36.099 WARNING [localhost-startStop-2]
org.apache.catalina.loader.WebappClassLoaderBase.clearReferencesThreads The
web application [idp] appears to have started a thread named
[AsyncAppender-Worker-ASYNC_PROCESS] but has failed to stop it. This is
very likely to create a memory leak. Stack trace of thread:
 sun.misc.Unsafe.park(Native Method)
 java.util.concurrent.locks.LockSupport.park(LockSupport.java:175)
 java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.await(AbstractQueuedSynchronizer.java:2039)
 java.util.concurrent.ArrayBlockingQueue.take(ArrayBlockingQueue.java:403)
 ch.qos.logback.core.AsyncAppenderBase$Worker.run(AsyncAppenderBase.java:250)
16-Dec-2016 16:35:36.133 INFO [main]
org.apache.coyote.AbstractProtocol.stop Stopping ProtocolHandler
["ajp-nio-127.0.0.1-8009"]
16-Dec-2016 16:35:36.136 INFO [main]
org.apache.coyote.AbstractProtocol.destroy Destroying ProtocolHandler
["ajp-nio-127.0.0.1-8009"]


Versions:

Tomcat: 8.5.8
Java: JDK 8u112
IdP: 3.3.0
OS: RHEL7
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