Struggling to get JMX active for Tomcat

Hi all

Trying to get jmx to work. Our nimsoft app uses it for remote
performance monitoring of our iseries tomcat servers.
In the tomcat setenv.sh I added these settings:

-Dcom.sun.management.jmxremote -Dcom.sun.management.jmxremote.port=48035
-Dcom.sun.management.jmxremote.ssl=false
-Dcom.sun.management.jmxremote.authenticate=false"

In the server.xml I added:
<Listener
className="org.apache.catalina.mbeans.JMXAdaptorLifecycleListener"
namingPort="48035" port="48030" host="10.97.15.12" />
The Tomcat server starts and keeps running yet gives an rmi error:
This is an extract of the catalina.out:
7-okt-2010 15:30:14 org.apache.commons.logging.impl.Jdk14Logger info

INFO: Find registry server-registry.xml at classpath resource

7-okt-2010 15:30:14 org.apache.commons.logging.impl.Jdk14Logger error

SEVERE: Error while setting up remote JMX connector

java.rmi.server.ExportException: internal error: ObjID already in use

at java.lang.Throwable.<init>(Throwable.java:196)

at java.lang.Exception.<init>(Exception.java:41)

at java.io.IOException.<init>(IOException.java:40)

at java.rmi.RemoteException.<init>(RemoteException.java:62)

at java.rmi.server.ExportException.<init>(ExportException.java:36)

at sun.rmi.transport.ObjectTable.putTarget(ObjectTable.java:169)

at sun.rmi.transport.Transport.exportObject(Transport.java:75)

at
sun.rmi.transport.tcp.TCPTransport.exportObject(TCPTransport.java:196)
at sun.rmi.transport.tcp.TCPEndpoint.exportObject(TCPEndpoint.java:382)

at sun.rmi.transport.LiveRef.exportObject(LiveRef.java:116)

at
sun.rmi.server.UnicastServerRef.exportObject(UnicastServerRef.java:180)
at sun.rmi.registry.RegistryImpl.setup(RegistryImpl.java:92)

at sun.rmi.registry.RegistryImpl.setup(RegistryImpl.java:92)

at
java.rmi.registry.LocateRegistry.createRegistry(LocateRegistry.java:186)

at
org.apache.catalina.mbeans.JMXAdaptorLifecycleListener.start(JMXAdaptorL
ifecycleListener.java:291)
at
org.apache.catalina.mbeans.JMXAdaptorLifecycleListener.lifecycleEvent(JM
XAdaptorLifecycleListener.java:230)
at
org.apache.catalina.util.LifecycleSupport.fireLifecycleEvent(LifecycleSu
pport.java:119)
at
org.apache.catalina.core.StandardServer.start(StandardServer.java:688)

at org.apache.catalina.startup.Catalina.start(Catalina.java:537)

at
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.jav
a:39)
at
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessor
Impl.java:25)
at java.lang.reflect.Method.invoke(Method.java:585)

at org.apache.catalina.startup.Bootstrap.start(Bootstrap.java:271)

at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:409)

7-okt-2010 15:30:14 org.apache.commons.logging.impl.Jdk14Logger info

INFO: Server startup in 22501 ms


If I look at netstat I see that port 48035 is listening, but there seems
no application behind it. I think normally http://<host>:48035 should
give a response. Is this correct?

We have one other websphere JVM that uses rmi, maybe that is the
problem.

Also the info message before the cancelation speaks of a
server-registry.xml. This file is nowhere to be found. Do I need this?
What should it look like?

java version "1.5.0"
Java(TM) 2 Runtime Environment, Standard Edition (build 1.5.0_13-b05)
Classic VM (build 1.5, build JDK-1.5, native threads, jitc_de)
Running on OS400 V5R4M0 TC08305

Hope someone can help, I'm out of ideas...

thanks!
Tom





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