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https://issues.apache.org/jira/browse/AMQ-6602?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Christopher L. Shannon resolved AMQ-6602.
-----------------------------------------
Resolution: Fixed
Fix Version/s: 5.14.4
5.15.0
Resolved the issue by using a variation of double checked locking so that the
synchronized penalty only occurs when initialization is first needed. After
initialization is complete threads will no longer need to synchronize every
init() call.
> Memory leak when undeploying webapp with ActiveMQ client
> --------------------------------------------------------
>
> Key: AMQ-6602
> URL: https://issues.apache.org/jira/browse/AMQ-6602
> Project: ActiveMQ
> Issue Type: Bug
> Components: JMS client
> Affects Versions: 5.14.3
> Reporter: Mykola Markov
> Assignee: Christopher L. Shannon
> Priority: Minor
> Labels: leak
> Fix For: 5.15.0, 5.14.4
>
> Attachments: AMQ-6602.patch
>
>
> I have a web app with an ActiveMQ client. When undeploying the app, Tomcat
> logs the following messages.
> {code}
> 15-Feb-2017 17:53:31.760 WARNING [localhost-startStop-2]
> org.apache.catalina.loader.WebappClassLoaderBase.clearReferencesThreads The
> web application [Engine] appears to have started a thread named [ActiveMQ
> Session: ID:comp-41144-1487186920452-1:1:3] 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.lang.Object.wait(Object.java:502)
>
> org.apache.activemq.thread.DedicatedTaskRunner.runTask(DedicatedTaskRunner.java:119)
>
> org.apache.activemq.thread.DedicatedTaskRunner$1.run(DedicatedTaskRunner.java:42)
> 15-Feb-2017 17:53:31.761 WARNING [localhost-startStop-2]
> org.apache.catalina.loader.WebappClassLoaderBase.clearReferencesThreads The
> web application [Engine] appears to have started a thread named [ActiveMQ
> Session: ID:comp-41144-1487186920452-1:1:2] 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.lang.Object.wait(Object.java:502)
>
> org.apache.activemq.thread.DedicatedTaskRunner.runTask(DedicatedTaskRunner.java:119)
>
> org.apache.activemq.thread.DedicatedTaskRunner$1.run(DedicatedTaskRunner.java:42)
> 15-Feb-2017 17:53:31.762 WARNING [localhost-startStop-2]
> org.apache.catalina.loader.WebappClassLoaderBase.clearReferencesThreads The
> web application [Engine] appears to have started a thread named [ActiveMQ
> Session: ID:comp-41144-1487186920452-1:1:4] 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.lang.Object.wait(Object.java:502)
>
> org.apache.activemq.thread.DedicatedTaskRunner.runTask(DedicatedTaskRunner.java:119)
>
> org.apache.activemq.thread.DedicatedTaskRunner$1.run(DedicatedTaskRunner.java:42)
> 15-Feb-2017 17:53:31.762 WARNING [localhost-startStop-2]
> org.apache.catalina.loader.WebappClassLoaderBase.clearReferencesThreads The
> web application [Engine] appears to have started a thread named [ActiveMQ
> Session: ID:comp-41144-1487186920452-1:1:10] 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.lang.Object.wait(Object.java:502)
>
> org.apache.activemq.thread.DedicatedTaskRunner.runTask(DedicatedTaskRunner.java:119)
>
> org.apache.activemq.thread.DedicatedTaskRunner$1.run(DedicatedTaskRunner.java:42)
> 15-Feb-2017 17:53:31.763 WARNING [localhost-startStop-2]
> org.apache.catalina.loader.WebappClassLoaderBase.clearReferencesThreads The
> web application [Engine] appears to have started a thread named [ActiveMQ
> Session: ID:comp-41144-1487186920452-1:1:6] 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.lang.Object.wait(Object.java:502)
>
> org.apache.activemq.thread.DedicatedTaskRunner.runTask(DedicatedTaskRunner.java:119)
>
> org.apache.activemq.thread.DedicatedTaskRunner$1.run(DedicatedTaskRunner.java:42)
> Feb 15, 2017 5:53:31 PM org.apache.catalina.core.ApplicationContext log
> INFO: Closing Spring root WebApplicationContext
> {code}
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