ModelMBean (Java SE 13 & JDK 13 )
Description: declaration: module: java.management, package: javax.management.modelmbean, interface: ModelMBean
Keywords: javax.management.modelmbean.ModelMBean interface

Module java.management
Package javax.management.modelmbean

# Interface ModelMBean

All Superinterfaces:
  `DynamicMBean`, `ModelMBeanNotificationBroadcaster`, `NotificationBroadcaster`, `PersistentMBean`

All Known Implementing Classes:
  `RequiredModelMBean`

    public interface ModelMBean
    extends DynamicMBean, PersistentMBean, ModelMBeanNotificationBroadcaster

This interface must be implemented by the ModelMBeans. An implementation of this interface must be shipped with every JMX Agent.

Java resources wishing to be manageable instantiate the ModelMBean using the MBeanServer's createMBean method. The resource then sets the ModelMBeanInfo (with Descriptors) for the ModelMBean instance. The attributes and operations exposed via the ModelMBeanInfo for the ModelMBean are accessible from MBeans, connectors/adaptors like other MBeans. Through the ModelMBeanInfo Descriptors, values and methods in the managed application can be defined and mapped to attributes and operations of the ModelMBean. This mapping can be defined during development in an XML formatted file or dynamically and programmatically at runtime.

Every ModelMBean which is instantiated in the MBeanServer becomes manageable: its attributes and operations become remotely accessible through the connectors/adaptors connected to that MBeanServer. A Java object cannot be registered in the MBeanServer unless it is a JMX compliant MBean. By instantiating a ModelMBean, resources are guaranteed that the MBean is valid.

MBeanException and RuntimeOperationsException must be thrown on every public method. This allows for wrapping exceptions from distributed communications (RMI, EJB, etc.). These exceptions do not have to be thrown by the implementation except in the scenarios described in the specification and javadoc.

Since:
  1.5

- ## Method Summary

  Modifier and Type | Method | Description
  --- | --- | ---
  `void` | `setManagedResource​(Object mr, String mr_type)` | Sets the instance handle of the object against which to execute all methods in this ModelMBean management interface (MBeanInfo and Descriptors).
  `void` | `setModelMBeanInfo​(ModelMBeanInfo inModelMBeanInfo)` | Initializes a ModelMBean object using ModelMBeanInfo passed in.

  ### Methods declared in interface javax.management.DynamicMBean

  `getAttribute, getAttributes, getMBeanInfo, invoke, setAttribute, setAttributes`

  ### Methods declared in interface javax.management.modelmbean.ModelMBeanNotificationBroadcaster

  `addAttributeChangeNotificationListener, removeAttributeChangeNotificationListener, sendAttributeChangeNotification, sendAttributeChangeNotification, sendNotification, sendNotification`

  ### Methods declared in interface javax.management.NotificationBroadcaster

  `addNotificationListener, getNotificationInfo, removeNotificationListener`

  ### Methods declared in interface javax.management.PersistentMBean

  `load, store`

- ## Method Details

  - ### setModelMBeanInfo

    void setModelMBeanInfo​(ModelMBeanInfo inModelMBeanInfo) throws MBeanException, RuntimeOperationsException
    Initializes a ModelMBean object using ModelMBeanInfo passed in. This method makes it possible to set a customized ModelMBeanInfo on the ModelMBean as long as it is not registered with the MBeanServer.
    Once the ModelMBean's ModelMBeanInfo (with Descriptors) are customized and set on the ModelMBean, the ModelMBean can be registered with the MBeanServer.

    If the ModelMBean is currently registered, this method throws a `RuntimeOperationsException` wrapping an `IllegalStateException`

    Parameters:
      `inModelMBeanInfo` - The ModelMBeanInfo object to be used by the ModelMBean.
    Throws:
      `MBeanException` - Wraps a distributed communication Exception.
      `RuntimeOperationsException` -
      - Wraps an `IllegalArgumentException` if the MBeanInfo passed in parameter is null.
      - Wraps an `IllegalStateException` if the ModelMBean is currently registered in the MBeanServer.

  - ### setManagedResource

    void setManagedResource​(Object mr, String mr_type) throws MBeanException, RuntimeOperationsException, InstanceNotFoundException, InvalidTargetObjectTypeException
    Sets the instance handle of the object against which to execute all methods in this ModelMBean management interface (MBeanInfo and Descriptors).
    Parameters:
      `mr` - Object that is the managed resource
      `mr_type` - The type of reference for the managed resource. Can be: ObjectReference, Handle, IOR, EJBHandle, RMIReference. If the MBeanServer cannot process the mr_type passed in, an InvalidTargetTypeException will be thrown.
    Throws:
      `MBeanException` - The initializer of the object has thrown an exception.
      `RuntimeOperationsException` - Wraps an IllegalArgumentException: The managed resource type passed in parameter is null.
      `InstanceNotFoundException` - The managed resource object could not be found
      `InvalidTargetObjectTypeException` - The managed resource type cannot be processed by the ModelMBean or JMX Agent.