J2SE 5.0 includes monitoring. For more details on management of Java-based systems, see this article. The JDK 5.0 includes a tool called JConsole that will provide performance information. In this article we will use JConsole to monitor a Geronimo server. The first step is to call the jar file for the app you want to monitor with the management options:

[root@srv-1 gerdir]# java -Dcom.sun.management.jmxremote -jar bin/server.jar
Booting Geronimo Kernel (in Java 1.5.0_05)...
Starting Geronimo Application Server
[*****************] 100%  30s Startup complete                         
Listening on Ports:
1099 0.0.0.0 RMI Naming
1527 0.0.0.0 Derby Connector
.
.
.

We now start jconsole, using the same userid used to start the process we wish to monitor:

[root@srv-1 ~]# jconsole

We choose the JVM we want to monitor:

Here are some screenshots that give you an idea of JConsole’s capabilities:

For more information on JConsole, see this document.