javax.management.loading (Java Platform SE 8 )
Keywords: javax.management.loading package
Date: 2026-04-17

# Package javax.management.loading

Provides the classes which implement advanced dynamic loading.

See: Description

- Interface Summary
  Interface | Description
  --- | ---
  ClassLoaderRepository | Instances of this interface are used to keep the list of ClassLoaders registered in an MBean Server.
  MLetMBean | Exposes the remote management interface of the MLet MBean.
  PrivateClassLoader | Marker interface indicating that a ClassLoader should not be added to the `ClassLoaderRepository`.

- Class Summary
  Class | Description
  --- | ---
  DefaultLoaderRepository | Deprecated Use `MBeanServer.getClassLoaderRepository()`} instead.
  MLet | Allows you to instantiate and register one or several MBeans in the MBean server coming from a remote URL.
  MLetContent | This class represents the contents of the `MLET` tag.
  PrivateMLet | An MLet that is not added to the `ClassLoaderRepository`.

## Package javax.management.loading Description

Provides the classes which implement advanced dynamic loading. See the chapter Advanced Dynamic Loading in the JMX Specification.

An MBean that is of a subclass of `ClassLoader` can be used as a class loader to create other MBeans via the method `MBeanServer.createMBean(String, ObjectName, ObjectName, Object[], String[])`, and to instantiate arbitrary objects via the method `MBeanServer.instantiate(String, ObjectName, Object[], String[])`. The `MLet` class is an example of such an MBean. It is a `URLClassLoader`, so the list of URLs to load classes from can be configured.

Additionally, an `MLet` can read a configuration file that specifies a set of MBeans to be registered in the same MBean Server as the `MLet`.

Every MBean Server has a class loader repository containing all MBeans registered in that MBean Server that are of a subclass of `ClassLoader`. The class loader repository is used by the forms of the `createMBean` and `instantiate` methods in the `MBeanServer` interface that do not have an explicit loader parameter. It is also used by the `MLet` class when it does not find a class in its own set of URLs.

If an MBean implements the interface `PrivateClassLoader`, then it is not added to the class loader repository. The class `PrivateMLet` is a subclass of `MLet` that implements `PrivateClassLoader`.

Since:
  1.5
See Also:
  Java Platform documentation on JMX technology, in particular the JMX Specification, version 1.4(pdf).

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