Network Deployment (Distributed operating systems), v8.0 > Administer applications and their environment > Use the administrative clients > Use administrative programs (JMX)


This topic gives an overview of JMX in general and how this standard applies to WAS.

Java Management Extensions overview

JMX is the Java standard for managing application resources. The management architecture that is defined by JMX is divided into three levels:

Java Management Extensions in WAS

JMX is at the core of Application Server administration capabilities. The application server contains a JMX agent. All of the system components are defined as MBeans. The JMX agent in Application Server supports the following connectors: JSR160RMI, Remote Method Invocation/Internet Inter-ORB Protocol (RMI/IIOP), Simple Object Access Protocol/Hypertext Transfer Protocol (SOAP/HTTP), Simple Object Access Protocol/Hypertext Transfer Protocol Secure (SOAP/HTTPS), and Inter-Process Communications (IPC), which provides remote access to the server resources. All of the administration tools included with Application Server use these JMX facilities to accomplish their functions.

In a stand-alone Application Server installation, servers exist and are administered individually. An administrative client connects directly to the Application Server in this environment.

In a WAS ND installation, a hierarchical topology groups application servers within nodes and groups nodes within a cell. Administrative servers exist at the node level (node agents) and at the cell level (the dmgr), and act as aggregation points for the administrative services in the subordinate servers.

MBeans in all servers on a node are visible through that node agent, and MBeans in all nodes are visible through the dmgr. Therefore, by connecting to the dmgr, you can invoke operations, can get and set attributes, and can receive notifications for any MBean in the cell. Application Server provides an AdminService class that reflects the standard JMX MBeanServer interface, and wraps the MBeanServer interface so that it takes part in implementing this distributed management functionality.


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