...
Monitoring and Management Using JMX
http://java.sun.com/j2se/1.5.0/docs/guide/management/agent.html
Using JConsole to Monitor Applications
http://java.sun.com/developer/technicalArticles/J2SE/jconsole.html
...
Monitoring and Management Using JMX
http://java.sun.com/j2se/1.5.0/docs/guide/management/agent.html
Using JConsole to Monitor Applications
http://java.sun.com/developer/technicalArticles/J2SE/jconsole.html