Issue logging in into Tomcat JMX Services via jconsloe : javax.management.remote.rmi.RMIConnector.connect(RMIConnector.java:281)

We are running Tomcat 6 on RHEL 5 and Oracle JDK 1.6_24 and I am having a problem loggin into the jmx services remotely through jconsole.

Here is my setenv.sh :

JAVA_OPTS="-Xms512m -Xmx1152m -XX:MaxPermSize=512m"
CATALINA_OPTS="$CATALINA_OPTS -Dcom.sun.management.jmxremote -Dcom.sun.management.jmxremote.port=9888"
CATALINA_OPTS="$CATALINA_OPTS -Dcom.sun.management.jmxremote.ssl=false -Dcom.sun.management.jmxremote.authenticate=false"
CATALINA_OPTS="$CATALINA_OPTS -Djava.rmi.server.hostname=192.168.XX.XX"
CATALINA_OPTS="$CATALINA_OPTS -Djava.rmi.开发者_如何学Cserver.logCalls=true"

Here is the output from 'ps -elf | grep tomcat' (I also see the 9888 port listening when using netstat) :

0 S root      2930     1  1  85   0 - 500084 184466 20:47 ?       00:00:15 /usr/java/default/bin/java -Djava.util.logging.config.file=/usr/local/tomcat/conf/logging.properties -Xms512m -Xmx1152m -XX:MaxPermSize=512m 
-Djava.util.logging.manager=org.apache.juli.ClassLoaderLogManager -server -Dbuild.compiler.emacs=true -Dcom.sun.management.jmxremote -Dcom.sun.management.jmxremote.port=9888 -Dcom.sun.management.jmxremote.ssl=false 
-Dcom.sun.management.jmxremote.authenticate=false -Djava.rmi.server.hostname=192.168.XX.XX -Djava.rmi.server.logCalls=true -Djava.endorsed.dirs=/usr/local/tomcat/endorsed
 -classpath /usr/local/tomcat/bin/bootstrap.jar -Dcatalina.base=/usr/local/tomcat -Dcatalina.home=/usr/local/tomcat -Djava.io.tmpdir=/usr/local/tomcat/temp org.apache.catalina.startup.Bootstrap start

Then when trying to connect through jconsole I am running the following command :

jconsole -debug 192.168.XX.XX:9888

It throws the following error:

java.lang.NullPointerException
at javax.management.remote.rmi.RMIConnector.connect(RMIConnector.java:281)
at javax.management.remote.rmi.RMIConnector.connect(RMIConnector.java:228)
at sun.tools.jconsole.ProxyClient.tryConnect(ProxyClient.java:334)
at sun.tools.jconsole.ProxyClient.connect(ProxyClient.java:296)
at sun.tools.jconsole.VMPanel$2.run(VMPanel.java:281)

I have run out of ideas for debugging this and can't seem to find any answers. Any thought or ideas?

As a second problem, shutting down tomcat does not stop the jmx process and i cannot restart tomcat since it is still listening on 9888. Do I have to specify anything to stop the JMX process during shutdown?

Thanks all

• Dustin Chesterman

I just had the same problem. The fix ended up being to remove the hostname from the 127.0.0.1 line of my /etc/hosts file. This was causing JMX to bind to localhost when it created its data connection.

This link will help, you have to specify both the ports. This method is the way to specify both ports. http://gabenell.blogspot.com/2010/04/connecting-to-jmx-on-tomcat-6-through.html

I have got the jconsole to connect without using any authentication but not with authentication. Anybody got this to work?

I had this kind of error when I had iptables configured on my server. It blocked incoming traffing on these ports. In my setup Tomcat always opened 2 random JMX-ports.

I'll try to find my config files.

k-deux