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JConsole is a graphical tool; it allows you to remotely manage and monitor your server and web application status using JMX. When following the instructions given below, please also ensure that you make any necessary changes to any anti-virus software you may be using which may prevent jconsole from running.
To monitor Jetty's server status with JConsole, make sure JConsole is running, and start Jetty with a special system property.
The simplest way to enable support is to open the jetty.home/start.ini file and uncomment the corresponding section so it looks like this:
... --exec ... #=========================================================== # JMX Management # To enable remote JMX access uncomment jmxremote and # enable --exec or use --exec-print (see above) #----------------------------------------------------------- OPTIONS=jmx jetty.jmxrmihost=localhost jetty.jmxrmiport=1099 -Dcom.sun.management.jmxremote etc/jetty-jmx.xml #===========================================================
If you are running the Jetty Maven Plugin, you must set the system property com.sun.management.jmxremote on Maven before running the plugin. The way to do this is to set your MAVEN_OPTS environment variable (if you're not sure how to do this, consult the Maven documentation).
Here is an example that sets the system property on the fly in a BASH shell, before starting Jetty via the plugin:
$ export MAVEN_OPTS=-Dcom.sun.management.jmxremote $ mvn jetty:run $ jconsole & # runs jconsole in the background
When you start Jetty, you see a dialog box from JConsole with a list of running processes to which you can connect. It should look something like so:
If you don't see your Jetty process in the list of processes you can connect to, quickly switch tabs, or close and reopen a new "New Connection" dialog window. This forces JConsole to refresh the list, and recognize your newly-started Jetty process.
Select the start.jar entry and click the "Connect" button. A new JConsole window opens:
From this window you can monitor memory usage, thread usage, classloading and VM statistics. You can also perform operations such as a manual garbage collect. JConsole is an extremely powerful and useful tool.
The MBean tab of JConsole allows access to managed objects within the Java application, including MBeans the JVM provides. If you also want to interact with the Jetty JMX implementation via JConsole, you need to start Jetty JMX in a form that JConsole can access. See Using Java Management Extensions (JMX) for more information.