What version of Tomcat are you running? It appears that jmx support first surfaced at Tomcat 5.5. Tomcat 5.5 can use native jmx in Java 1.5 or use a jmx jar at Java 1.4.

There's a pretty good description of the setup at http://tomcat.apache.org/tomcat-5.5-doc/monitoring.html

Note that the latest Tomcat version supported by IBM is Tomcat 4.0. We've been running Tomcat 5.0 and 5.5 on i very successfully without that support.

-----Original Message-----
From: java400-l-bounces@xxxxxxxxxxxx [mailto:java400-l-bounces@xxxxxxxxxxxx] On Behalf Of Rooyen, Tom van
Sent: Tuesday, October 19, 2010 8:01 AM
To: java400-l@xxxxxxxxxxxx
Subject: 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

In the server.xml I added:
namingPort="48035" port="48030" host="" /> 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.TCPEndpoint.exportObject(TCPEndpoint.java:382)

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

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

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



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

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...


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