Java Management Extensions or JMX is a Java technology that supplies tools for managing and monitoring applications, system objects, devices (e.g. printers) and service oriented networks. An interesting detail of the API is that classes can be dynamically constructed and changed. The Java Platform is the name for a computing environment from Sun Microsystems which can run applications developed using the Java programming language and set of development tools. ... Application software is a loosely defined subclass of computer software that employs the capabilities of a computer directly to a task that the user wishes to perform. ... A computer printer is a computer peripheral device that produces a hard copy (permanent human-readable text and/or graphics, usually on paper) from data stored in a computer connected to it. ... In object-oriented programming, a class consists of a collection of types of encapsulated instance variables and types of methods, possibly with implementation of those types together with a constructor function that can be used to create objects of the class. ...

JMX was defined by JSR 3 of the Java Community Process. The Java Community Process or JCP, established in 1995, is a formalized process which allows interested parties to be involved in the definition of future versions and features of the Java platform. ...

Architecture

JMX uses a proprietary TCP/IP protocol to communicate with various devices in your intranet or on the Internet. The application server running the servlets will offer various methods that allow inquiry of the state of the device and to obtain detailed information, such as usage, logging information or error texts. An application server is a server computer in a computer network dedicated to running certain software applications. ... The Java Servlet API allows a software developer to add dynamic content to a web server using the Java platform. ...

A typical System Management tool uses a JMX heartbeat message to verify that the distributed devices are healthy. The heartbeat message invokes a method on the remote application servers and receives a response.

Support

JMX is supported at various levels by different vendors:

• JMX is supported by Java application servers such as JBoss, WebSphere, and Sun Java System Application Server.
• System management (computing) tools that support the protocol include HP OpenView.
• MX4J [1] is Open Source JMX for Enterprise Computing.
• MC4J [2] is an open source visual console for connecting to servers supporting JMX

An application server is a server computer in a computer network dedicated to running certain software applications. ... JBoss (pronounced Jay Boss) is an Open Source J2EE based application server implemented in pure Java. ... WebSphere refers to a brand of IBM software products, although the term also popularly refers to one specific product: WebSphere Application Server (WAS). ... Sun Microsystems is a computer, semiconductor and software manufacturer headquartered in Santa Clara, California, in Silicon Valley. ... In computing, system management refers to the process, techniques, and tools required to control and measure the configuration and operation of hardware and software in a computing system. ... OpenView is a Hewlett Packard product range consisting of an extensive portfolio of network and systems management products. ... MX4J is a project to create an open-source implementation of JMX, Java Management Extensions. ... MC4J is an open source project to create a visual management application for Java servers supporting the JMX specification. ...

See also

• Java Dynamic Management Kit
• JavaBeans
• Metaclass
• Metaprogramming
• Reflection
• Simple network management protocol
• Network Management
• JINI
• OSGi
• OpenJava
• OpenC++

The Java Dynamic Management Kit or JDMK is a Java technology that provides a Java API and a collection of software tools for developing and designing JMX based applications. ... The Enterprise Java Beans specification is one of the several Java APIs in the Java 2 Platform, Enterprise Edition. ... A metaclass is a class that manages all relationships to class instances (objects). ... Metaprogramming is the writing of programs that write or manipulate other programs (or themselves) as their data or that do part of the work that is otherwise done at runtime during compile time. ... The word reflection (also spelt reflexion in British English) can refer to several different concepts: In mathematics, reflection is the transformation of a space. ... The Simple Network Management Protocol (SNMP) forms part of the internet protocol suite as defined by the Internet Engineering Task Force. ... Network management, typically applied to large scale networks such as computer networks, telecommunication networks etc. ... JINIâ„¢ (pronounced like genie, a pseudo-acronym: Jini Is Not Initials) is a network architecture for the construction of distributed systems where scale, rate of change and complexity of interactions within and between networks are extremely important and cannot be satisfactorily addressed by existing technologies. ... The OSGi Alliance is an open standards organization formed by Sun Microsystems, IBM, Ericsson and others in March 1999 (after it was first called the Connected Alliance). ... OpenJava is a programming tool that parses and analyzes Java source code. ... The title given to this article is incorrect due to technical limitations. ...

References

• J. Steven Perry: Java Management Extensions, O'Reilly, ISBN 0-596-00245-9
• Marc Fleury, Juha Lindfors: JMX: Managing J2EE with Java Management Extensions, Sams Publishing, ISBN 0-672-32288-9
• Jeff Hanson: Connecting JMX Clients and Servers: Understanding the Java Management Extensions, APress L. P., ISBN 1-59059-101-1

Jeff Hanson was born in Milwaukee, Wisconsin and is well known for singing in a falsetto that often causes him to be mistaken for a girl. ...

External links

• JMX on java.sun.com
• JMX at JBoss.com
• JSR 3
• Articles
  • "Enabling Component Architectures with JMX" by Marc Fleury and Juha Lindfors
  • "Introducing A New Vendor-Neutral J2EE Management API" by Andreas Schaefer
  • "Java in the management sphere" by Max Goff
  • "Managing J2EE Systems with JMX and JUnit" by Lucas McGregor
  • Java™ Management Extensions Protocol
  • JMX/JBoss - The microkernel design