JVM remote monitoring

Question

I was trying to configure JVM for remote monitoring but getting the below error on server

The configuration has not been set for this resource due to : Invalid configuration: Error contacting resource: Can't connect to MBeanServer [{jmx.username=system, jmx.url=service:jmx:rmi:///jndi/rmi://localhost:6969/jmxrmi}]: java.io.IOException: Failed to retrieve RMIServer stub: javax.naming.ServiceUnavailableException [Root exception is java.rmi.ConnectException: Connection refused to host: localhost; nested exception is: java.net.ConnectException: Connection refused]

I want to monitor tomcat server, according to the doc I have add the remote monitoring Mbean Server connection string in /tomcat/bin/catalina.sh file

[ $1 != "stop" ] && JAVA_OPTS="-Dcom.sun.management.jmxremote \ 
-Dcom.sun.management.jmxremote.port=6969 \ 
-Dcom.sun.management.jmxremote.ssl=false \ 
-Dcom.sun.management.jmxremote.authenticate=false $JAVA_OPTS" 
export JAVA_OPTS

I have restarted the tomcat service after that. But not able to see port 6969 listening on the server. After restarting the tomcat i have checked it via "netstat -an | grep 696" I think this is the problem. Port 6969 is not used on this machine.

Solution

Finally I make it work. I added the setting in JAVA_OPTS variable in tomcat startup script as below:

JAVA_OPTS="-Djava.awt.headless=true -Xms256m -Xmx1024m -XX:PermSize=512m -server -Dcom.sun.management.jmxremote -Dcom.sun.management.jmxremote.port=6969 -Dcom.sun.management.jmxremote.ssl=false -Dcom.sun.management.jmxremote.authenticate=false"

Comments

[Ramesh Kumar]

I am trying on the same machine

[Carlos Garcia]

Dont see the difference between this and the original, all are in catalina.sh how starts the server. ¿right? the only diff is that java.awt.headless... is that was prevented JMX to run? I dont use it and it works for me... ¿Maybe that $1 = Stop was the problem?