MX4J is a project to create an open source

Open source

The term open source describes practices in production and development that promote access to the end product's source materials. Some consider open source a philosophy, others consider it a pragmatic methodology...

 implementation of Java Management Extensions. The JMX specification is a Java Specification Request (see JSR 003) currently in maintenance release 1.2; the new JSR 160 has been issued to address connectivity to a remote JMX agent. MX4J implements both JSR 3 and JSR 160.

The MX4J project goals can be simplified as:

• Closely adhere to the JMX specification.
• Develop a highly robust codebase.
• Be 100% compatible with the reference implementations.

Due to its simplicity, MX4J is widely adopted in open source projects like Jetty Server

Jetty (web server)

Jetty is a pure Java-based HTTP client/server, WebSocket client/server and servlet container developed as a free and open source project as part of the Eclipse Foundation...

, Tomcat

Apache Tomcat

Apache Tomcat is an open source web server and servlet container developed by the Apache Software Foundation...

, Geronimo, Harmony

Apache Harmony

Apache Harmony was an open source, free Java implementation, developed by the Apache Software Foundation. It was announced in early May 2005 and on October 25, 2006, the Board of Directors voted to make Apache Harmony a top-level project...

, ObjectWeb JOnAS

JOnAS

JOnAS is an open-source implementation of the Java EE application server specification, developed and hosted by the ObjectWeb consortium ....

and many others.