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From Peter Rossbach ...@objektpark.de>
Subject Re: Tomcat 5 error during startup - 2nd connector doesn't work
Date Fri, 25 Nov 2005 08:22:07 GMT
Download MX4j 3.0.1 and cp mx4j.jar to bin/jmx.jar at your tomcat release.
Regards
Peter

Oded Arbel schrieb:

>Hi people.
>
>I'm using tomcat5 to host a commercial web site, and due to some 
>integration issues we are using a single service with two 
>CoyoteConnectors - one on port 8080 and one on port 8081.
>Here is the relevant configuration:
>
><Service name="Catalina">
><Connector port="8080"
>  maxThreads="150" minSpareThreads="25" maxSpareThreads="75"
>  enableLookups="false" redirectPort="8443" acceptCount="100"
>  debug="0" connectionTimeout="20000" disableUploadTimeout="true" />
><Connector port="8081"
>  maxThreads="150" minSpareThreads="25" maxSpareThreads="75"
>  enableLookups="false" redirectPort="8443" acceptCount="100"
>  debug="0" connectionTimeout="20000" disableUploadTimeout="true" />
>
>I've noticed that some times, when catalina is starting, I get this 
>error in the logs:
>
>Nov 24, 2005 4:28:30 PM org.apache.coyote.tomcat5.MapperListener init
>WARNING: Error registering contexts
>java.util.ConcurrentModificationException
>  at java.util.HashMap$HashIterator.nextEntry(HashMap.java:782)
>  at java.util.HashMap$EntryIterator.next(HashMap.java:824)
>  at java.util.HashMap.putAllForCreate(HashMap.java:424)
>  at java.util.HashMap.clone(HashMap.java:656)
>  at 
>mx4j.server.DefaultMBeanRepository.clone(DefaultMBeanRepository.java:56)
>  at 
>mx4j.server.MBeanServerImpl.findMBeansByPattern(MBeanServerImpl.java:1603)
>  at 
>mx4j.server.MBeanServerImpl.queryObjectNames(MBeanServerImpl.java:1568)
>  at 
>mx4j.server.MBeanServerImpl.queryMBeans(MBeanServerImpl.java:1512)
>  at 
>org.apache.coyote.tomcat5.MapperListener.init(MapperListener.java:115)
>  at 
>org.apache.coyote.tomcat5.CoyoteConnector.start(CoyoteConnector.java:1537)
>  at 
>org.apache.catalina.core.StandardService.start(StandardService.java:489)
>
>When that happens, HTTP requests to the second connector (port 8081) 
>return with error 400 - no host matches, while requests to the first 
>connector are handled just fine.
>
>It looks to me like a race condition where something (possibly 
>MBeanServerImpl) isn't locking a shared resource (or isn't locking it 
>properly) and an contained HashMap gets modifier concurrently. 
>I though initially about writing to the dev list, but I don't have any 
>idea what is that mx4j so I'm not sure if its the correct place to ask.
>
>BTW - I'm using tomcat 5.0.28.
>
>TIA
>  
>


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