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From Saurabh Singh <singh...@gmail.com>
Subject Apache Tomcat 5.5.17 - Error in manager app - HTML-500 on clicking 'Server Status'
Date Mon, 03 May 2010 11:48:50 GMT
Hi,

I am running a few applications on Tomcat 5.5.17, I used to normally go to
'Tomcat Manager' App and click the 'Server Status' link on top right side of
'Application List' page to monitor thread counts, memory usage etc..
My OS is Fedora Core-6 (2.6.22.9-61.fc6PAE)

This used to work well till yesterday but today it's giving HTML - 500
error.
There have been no changes made to Tomcat configuration in last 5-6 days
(tomcat is re-started daily and this was working after the last change made
by me - which was to increase thread count of 8080 connector from 150 to
200; but this was working for many days after that change was done and
tomcat restarted)

Can someone please help as to what may be wrong?

Below is Stack Trace from catalina.out
SEVERE: Servlet.service() for servlet Status threw exception
javax.management.InstanceNotFoundException:
Catalina:type=RequestProcessor,worker=http-8080,name=HttpRequest1012
        at
com.sun.jmx.interceptor.DefaultMBeanServerInterceptor.getMBean(Unknown
Source)
        at
com.sun.jmx.interceptor.DefaultMBeanServerInterceptor.getAttribute(Unknown
Source)
        at com.sun.jmx.mbeanserver.JmxMBeanServer.getAttribute(Unknown
Source)
        at
org.apache.catalina.manager.StatusTransformer.writeProcessorState(StatusTransformer.java:375)
        at
org.apache.catalina.manager.StatusTransformer.writeConnectorState(StatusTransformer.java:306)
        at
org.apache.catalina.manager.StatusManagerServlet.doGet(StatusManagerServlet.java:290)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:689)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
        at
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:252)
        at
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173)
        at
org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:213)
        at
org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:178)
        at
org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:524)
        at
org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:126)
        at
org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:105)
        at
org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:107)
        at
org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:148)
        at
org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:869)
        at
org.apache.coyote.http11.Http11BaseProtocol$Http11ConnectionHandler.processConnection(Http11BaseProtocol.java:664)
        at
org.apache.tomcat.util.net.PoolTcpEndpoint.processSocket(PoolTcpEndpoint.java:527)
        at
org.apache.tomcat.util.net.LeaderFollowerWorkerThread.runIt(LeaderFollowerWorkerThread.java:80)
        at
org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:684)
        at java.lang.Thread.run(Unknown Source)


Thanks & Regards
Saurabh Singh

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