MBean Attribute.

When a domain is active, WebLogic Server instantiates a collection of Managed Beans (MBeans) to represent the items that are defined by the domain's schema. For example, the xs:complexType serverType is represented by an MBean named ServerMBean.

The xs:element listen-port within serverType is represented by the ListenPort attribute of ServerMBean.

An MBean is a Java bean that provides a Java Management Extensions (JMX) interface. JMX is the J2EE solution for monitoring and managing resources on a network. Like SNMP and other management standards, JMX is a public specification and many vendors of commonly used monitoring products support it.