JMX - Mbean (Managed Bean|Manageable resource)

About

A managed bean (MBean) is a Java object that represents a JMX manageable resource in a distributed environment, such as:

• an application,
• a service,
• a component
• or a device.

An MBean is a named managed object representing a resource.

Developers of applications and devices are free to choose the granularity of objects that are instrumented as MBeans. An MBean might represent:

• the smallest object in an application,
• or the entire application.

Application components designed with their management interface in mind can typically be written as MBeans. MBeans can also be used as wrappers for legacy code without a management interface or as proxies for code with a legacy management interface.

Type

The JMX specification defines five types of MBean:

• Standard MBeans
• MXBeans
• Dynamic MBeans
• Open MBeans
• Model MBeans

The simplest types of MBean are standard MBeans and MXBeans.

Management

Addressing

A management application uses the object name to identify the object on which it is to perform a management operation.

Interface

The management interface of an MBean consists of:

• A set of readable or writable attributes, or both.
• A set of invokable operations.
• A self-description.
• Typed notifications that can be emitted by the MBean

Object Reference

The Java class of a standard MBean exposes the resource to be managed directly through:

• its attributes: (such as the cache system is off). Attributes are internal entities that are exposed through getter and setter methods.
• and operations: Operations are the other methods of the class that are available to managers. All these methods are defined statically.

Documentation / Reference

• See JMX - (Specification| API |JSR)