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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 Details

loadClass

public Class loadClass(String name)
            throws ClassNotFoundException
Attempts to load the given class using class loaders supplied by the list. The ClassLoader.loadClass(String) 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)
            throws ClassNotFoundException
Attempts to load the given class using class loaders supplied by the list, stopping when the specified loader is reached. The ClassLoader.loadClass(String) 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(String).
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)
            throws ClassNotFoundException
Attempts to load the given class using class loaders supplied by the list, excluding the one specified. The ClassLoader.loadClass(String) 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(String).
name - the name of the class to load.
Returns:
the loaded class.
Throws:
ClassNotFoundException - if all the class loaders fail to load the class.
ClassLoaderRepository.java -- Represents a collection of class loadersx. Copyright (C) 2006 Free Software Foundation, Inc. This file is part of GNU Classpath. GNU Classpath is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2, or (at your option) any later version. GNU Classpath is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with GNU Classpath; see the file COPYING. If not, write to the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. Linking this library statically or dynamically with other modules is making a combined work based on this library. Thus, the terms and conditions of the GNU General Public License cover the whole combination. As a special exception, the copyright holders of this library give you permission to link this library with independent modules to produce an executable, regardless of the license terms of these independent modules, and to copy and distribute the resulting executable under terms of your choice, provided that you also meet, for each linked independent module, the terms and conditions of the license of that module. An independent module is a module which is not derived from or based on this library. If you modify this library, you may extend this exception to your version of the library, but you are not obligated to do so. If you do not wish to do so, delete this exception statement from your version.

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