javax.management.loading

Interface ClassLoaderRepository

public interface ClassLoaderRepository

Implementations of this interface maintain a list of ClassLoaders for use by the management servers, allowing classes to be loaded by the first ClassLoader that will do so. A class loader is added to the list whenever a ClassLoader instance is registered with the management server, and it does not implement the PrivateClassLoader interface. They are removed when unregistered. The first class loader in the list is always the one which was used to load the management server itself.

Since: 1.5

See Also: MBeanServerFactory

Method Summary
Class<?>loadClass(String name)
Attempts to load the given class using class loaders supplied by the list.
Class<?>loadClassBefore(ClassLoader stop, String name)

Attempts to load the given class using class loaders supplied by the list, stopping when the specified loader is reached.

Class<?>loadClassWithout(ClassLoader exclude, String name)

Attempts to load the given class using class loaders supplied by the list, excluding the one specified.

Method Detail

loadClass

public Class<?> loadClass(String name)
Attempts to load the given class using class loaders supplied by the list. The loadClass method of each class loader is called. If the method returns successfully, then the returned Class instance is returned. If a ClassNotFoundException is thrown, then the next loader is tried. Any other exception thrown by the method is passed back to the caller. This method throws a ClassNotFoundException itself if all the class loaders listed prove fruitless.

Parameters: name the name of the class to load.

Returns: the loaded class.

Throws: ClassNotFoundException if all the class loaders fail to load the class.

loadClassBefore

public Class<?> loadClassBefore(ClassLoader stop, String name)

Attempts to load the given class using class loaders supplied by the list, stopping when the specified loader is reached. The loadClass method of each class loader is called. If the method returns successfully, then the returned Class instance is returned. If a ClassNotFoundException is thrown, then the next loader is tried. Any other exception thrown by the method is passed back to the caller. This method throws a ClassNotFoundException itself if all the class loaders listed prove fruitless.

This method is usually used by the class loader specified by the stop argument to load classes using the loaders that appear before it in the list. By stopping when the loader is reached, the deadlock that occurs when the loader is merely skipped is avoided.

Parameters: stop the class loader at which to stop, or null to obtain the same behaviour as loadClass. name the name of the class to load.

Returns: the loaded class.

Throws: ClassNotFoundException if all the class loaders fail to load the class.

loadClassWithout

public Class<?> loadClassWithout(ClassLoader exclude, String name)

Attempts to load the given class using class loaders supplied by the list, excluding the one specified. The loadClass method of each class loader is called. If the method returns successfully, then the returned Class instance is returned. If a ClassNotFoundException is thrown, then the next loader is tried. Any other exception thrown by the method is passed back to the caller. This method throws a ClassNotFoundException itself if all the class loaders listed prove fruitless.

Note that this method may deadlock if called simultaneously by two class loaders in the list. loadClassBefore(ClassLoader, String) should be used in preference to this method to avoid this.

Parameters: exclude the class loader to exclude, or null to obtain the same behaviour as loadClass. name the name of the class to load.

Returns: the loaded class.

Throws: ClassNotFoundException if all the class loaders fail to load the class.