JMX with Tomcat

[Pradeep Kumar]

Hello ranchers,
I have installed tomcat 6 with installer on Windows machine. I am not able to use Jconsole to connect to tomcat to see the registered MBeans. How do I connect to tomcat with Jconsole. Also how do i integrate the JMX with tomcat. Kindly reply. I am using jdk 1.6.

Regards,
Pradeep

[Ulf Dittmer]

Not sure what you mean by "integrate the JMX with Tomcat", but if you want to connect from JConsole to TC then you need to start TC with the "-Dcom.sun.management.jmxremote" property. The easiest way to do that would be to add a line like CATALINA_OPTS="-Djava.awt.headless=true -Dcom.sun.management.jmxremote" at an appropriate location to the bin/catalina.bat script.

[Pradeep Kumar]

Ulf Dittmer wrote:The easiest way to do that would be to add a line like CATALINA_OPTS="-Djava.awt.headless=true -Dcom.sun.management.jmxremote" at an appropriate location to the bin/catalina.bat script.

I have installed tomcat using the installer where in i do not have an option to edit the catalina.bat file. In this case how do I connect JConsole with TC?

[Rob Spoor]

You can use the "Configure Tomcat" shortcut that is created for you. Go to the "Java" tab, you can then add a new line to the "Java Options" field. It is recommended to use one line for each option so it will be a bit clearer where one option ends and the next one starts. For instance, I only added "-Dcom.sun.management.jmxremote" there and now I can see the memory MBeans in Lambda Probe. I couldn't get JConsole to connect to it yet but that has something to do with the security settings.

My full content of the "Java Options" field:

-Dcatalina.home=C:\Program Files\Apache Software Foundation\Tomcat 5.0
-Djava.endorsed.dirs=C:\Program Files\Apache Software Foundation\Tomcat 5.0\common\endorsed
-Djava.io.tmpdir=C:\Program Files\Apache Software Foundation\Tomcat 5.0
-Dcom.sun.management.jmxremote

[Pradeep Kumar]

I am able to configure the tomcat with JConsole. But I am not able to view the Mbeans deployed in tomcat using JConsole. How do I register in tomcat server and view the MBeans in jconsole. I tried using RMIconnector and I was able to see the deployed mbeans on tomcat using JConsole. The jsp code is given below for reference.

<%
try{
	java.util.ArrayList<javax.management.MBeanServer> list = javax.management.MBeanServerFactory.findMBeanServer(null);
	System.out.println("Size: "+list.size());
	for(int i=0;i<list.size();i++){
		javax.management.MBeanServer server = list.get(i);

	javax.management.remote.JMXServiceURL url = 
  new javax.management.remote.JMXServiceURL("service:jmx:rmi:///jndi/rmi://<hostname>:8999/server"); 
	javax.management.remote.JMXConnectorServer cs = 
	javax.management.remote.JMXConnectorServerFactory.newJMXConnectorServer(url, null, server); 
	javax.management.ObjectName csName = new javax.management.ObjectName(":type=cserver,name=mycserver");
		server.registerMBean(cs, csName);
	cs.start(); 

		
	}
}catch(Exception e){
	e.printStackTrace();
}finally{
}
	
%>

An in the JConsole i connected using the remote process giving the service:jmx:rmi:///jndi/rmi://<hostname>:8999/server value. Also I had started the rmi registry on 8999 port. I am not able to connect to tomcat directly. Kindly help me where I am going wrong.

[Pradeep Kumar]

Finally I was able to rectify the issue. The problem was with setting CATALINA_OPTS in proper location. ;-)