Mega Code Archive
Load classes
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/**
* EasyBeans
* Copyright (C) 2006 Bull S.A.S.
* Contact: easybeans@ow2.org
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or any later version.
*
* This library 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
* USA
*
* --------------------------------------------------------------------------
* $Id: ClassUtils.java 3783 2008-07-30 13:44:06Z benoitf $
* --------------------------------------------------------------------------
*/
/**
* The <code>ClassUtils</code> class is the central point used to load classes.
* @author Guillaume Sauthier
*/
public final class ClassUtils {
/**
* Default constructor.
*/
private ClassUtils() {}
/**
* Look up the class in the Tread Context ClassLoader and in the "current" ClassLoader.
* @param className The class name to load
* @return the corresponding Class instance
* @throws ClassNotFoundException if the Class was not found.
*/
public static Class forName(final String className) throws ClassNotFoundException {
// Load classes from different classloaders :
// 1. Thread Context ClassLoader
// 2. ClassUtils ClassLoader
ClassLoader tccl = Thread.currentThread().getContextClassLoader();
Class cls = null;
try {
// Try with TCCL
cls = Class.forName(className, true, tccl);
} catch (ClassNotFoundException cnfe) {
// Try now with the classloader used to load ClassUtils
ClassLoader current = ClassUtils.class.getClassLoader();
try {
cls = Class.forName(className, true, current);
} catch (ClassNotFoundException cnfe2) {
// If this is still unknown, throw an Exception
throw cnfe2;
}
}
return cls;
}
/**
* Look up the class in the Tread Context ClassLoader and in the "current" ClassLoader.
* @param className The class name to load
* @param clazz a class used to get classloader
* @return the corresponding Class instance
* @throws ClassNotFoundException if the Class was not found.
*/
public static Class forName(final String className, final Class clazz) throws ClassNotFoundException {
// Load classes from different classloaders :
// 1. Thread Context ClassLoader
// 2. ClassUtils ClassLoader
ClassLoader tccl = Thread.currentThread().getContextClassLoader();
Class cls = null;
try {
// Try with TCCL
cls = Class.forName(className, true, tccl);
} catch (ClassNotFoundException cnfe) {
// Try now with the classloader used to load ClassUtils
ClassLoader current = clazz.getClassLoader();
if (current != null) {
try {
cls = Class.forName(className, true, current);
} catch (ClassNotFoundException cnfe2) {
// If this is still unknown, throw an Exception
throw new ClassNotFoundException("Class Not found in current ThreadClassLoader '" + tccl + "' and in '" + current + "' classloaders.", cnfe2);
}
} else {
// rethrow exception
throw cnfe;
}
}
return cls;
}
}
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