Java Dynamic Management Kit open sourced as OpenDMK
Sun has open sourced the Java Dynamic Management Kit as OpenDMK. If you haven’t experienced the beauty that is JConsole (which uses JMX to retrieve all kinds of useful bits from your JVM), be sure to fire it up sometime. Now imagine JConsole on steroids, built right into your application. This can really take management of a large Java system (spread across many physical machines) to a new level. Disclaimer: I haven’t used this library yet, so I can only hope that it’s as great as they say it is.