How to Enable JMX in Tomcat

As a  Tomcat administrator, we should enable JMX in tomcat to monitor Heap Memory, Threads, CPU Usage, Classes, and configure various MBeans.

I will try to show step by step process to enable and connect to Tomcat with JConsole.

Note: Please have JDK installed on your windows server.

Step 1: Go to path where you have Tomcat installed and then go to the bin directory.

Setp 2: update following variables/parameters under setenv.sh

-Dcom.sun.management.jmxremote -Dcom.sun.management.jmxremote.port=11111 -Dcom.sun.management.jmxremote.ssl=false 
-Dcom.sun.management.jmxremote.authenticate=false


Note :

1. Dcom.sun.management.jmxremote.port=11111                              Please modify the port number as per your need, make sure the port is free ( netstat –anlp | grep 11111)
2. Dcom.sun.management.jmxremote.ssl=false                                  This means connect without SSL
3. Dcom.sun.management.jmxremote.authenticate=false                This means no authentication needed when you use JMX client to connect to Tomcat instance.

Step 4: Restart tomcat server. 
Step 5 : On you windows server, go to the path where JDK is installed and then launch jconsole from **/bin directory.
Step 6: In Jconsole pop-up, select "Remote Process" and the enter following information.
        tomcat_server_host_name:11111
        username: Tomcat_username
        Password: Password
Step 7: Click on connect.