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Tomcat - Error Logs

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# 1  
Old 09-14-2012
Tomcat - Error Logs
Hi Gurus,

Our tomcat server was found hanging and responding to requests although ports 8080 & 8009(AJP) were found in listening state. The catalina.out had the below output:

Quote:
Sep 11, 2012 8:18:33 AM org.apache.tomcat.util.net.JIoEndpoint$Acceptor run
SEVERE: Socket accept failed
java.lang.ThreadDeath
at java.lang.Thread.stop(Thread.java:775)
at net.bull.javamelody.Action.stopThread(Action.java:351)
at net.bull.javamelody.Action.killThread(Action.java:337)
at net.bull.javamelody.Action.execute(Action.java:213)
at net.bull.javamelody.MonitoringController.executeActionIfNeeded(MonitoringController.java:122)
at net.bull.javamelody.MonitoringFilter.doMonitoring(MonitoringFilter.java:312)
at net.bull.javamelody.MonitoringFilter.doFilter(MonitoringFilter.java:150)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:233)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191)
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:433)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:128)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:293)
at org.apache.jk.server.JkCoyoteHandler.invoke(JkCoyoteHandler.java:190)
at org.apache.jk.common.HandlerRequest.invoke(HandlerRequest.java:291)
at org.apache.jk.common.ChannelSocket.invoke(ChannelSocket.java:769)
at org.apache.jk.common.ChannelSocket.processConnection(ChannelSocket.java:698)
at org.apache.jk.common.ChannelSocket$SocketConnection.runIt(ChannelSocket.java:891)
at org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:690)
at java.lang.Thread.run(Thread.java:679)

We have JavaMelody(Monitoring tool) packaged along with our application and it seems that monitoring through Java melody it has created this issue. Is my understanding correct? Can excessive usage of Javamelody hang tomcat servers?

Any insights is appreciated.

Thanks-in-advance,
HG
# 2  
Old 09-14-2012
It seems an essential thread was killed by someone (or an application) accessing the javamelody IHM.

google has been reported to cause that issue: https://jira.kuali.org/browse/OLE-25...tab#issue-tabs
# 3  
Old 09-17-2012
Thanks for the response. But i am Not able to access the link.

Thanks
HG
# 4  
Old 09-18-2012
The javamelody IHM is designed to administrators wanting to monitor the JVM. They can also select a thread and kill it.
The error message you get is likely due to a web crawler (e.g. google) exploring and indexing your web server unluckily accessing this thread management page, selecting the acceptor thread and "clicking" to the destroy link.
You need to secure access to javamelody to avoid this situation, e.g. password protect.
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