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JCommon is a free general purpose Java class library that is used in several projects at www.jfree.org, including JFreeChart and JFreeReport.

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/**
 * ========================================
 * JCommon : a free Java report library
 * ========================================
 *
 * Project Info:  http://www.jfree.org/jcommon/
 *
 * (C) Copyright 2000-2006, by Object Refinery Limited and Contributors.
 *
 * 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 (at your option) 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.
 *
 * [Java is a trademark or registered trademark of Sun Microsystems, Inc.
 * in the United States and other countries.]
 *
 * ------------
 * $Id: ClassPathDebugger.java,v 1.2 2008/09/10 09:23:34 mungady Exp $
 * ------------
 * (C) Copyright 2002-2006, by Object Refinery Limited.
 */

package org.jfree.base;

import java.util.Enumeration;

import org.jfree.util.ObjectUtilities;

/**
 * Creation-Date: 02.11.2007, 18:42:27
 *
 * @author Thomas Morgner
 */
public class ClassPathDebugger
{
  /**
   * Entry point.
   *
   * @param args  command line arguments.
   */
  public static void main(String[] args)
  {
    System.out.println ("Listing the various classloaders:");
    System.out.println ("Defined classloader source: " + ObjectUtilities.getClassLoaderSource());
    System.out.println ("User classloader: " + ObjectUtilities.getClassLoader());
    System.out.println ("Classloader for ObjectUtilities.class: " + ObjectUtilities.getClassLoader(ObjectUtilities.class));
    System.out.println ("Classloader for String.class: " + ObjectUtilities.getClassLoader(String.class));
    System.out.println ("Thread-Context Classloader: " + Thread.currentThread().getContextClassLoader());
    System.out.println ("Defined System classloader: " + ClassLoader.getSystemClassLoader());
    System.out.println();
    try
    {
      System.out.println ("Listing sources for '/jcommon.properties':");
      Enumeration resources = ObjectUtilities.getClassLoader
          (ObjectUtilities.class).getResources("jcommon.properties");
      while (resources.hasMoreElements())
      {
        System.out.println (" " + resources.nextElement());
      }
      System.out.println();
      System.out.println ("Listing sources for 'org/jfree/JCommonInfo.class':");
      resources = ObjectUtilities.getClassLoader
          (ObjectUtilities.class).getResources("org/jfree/JCommonInfo.class");
      while (resources.hasMoreElements())
      {
        System.out.println (" " + resources.nextElement());
      }
    }
    catch (Exception e)
    {
      e.printStackTrace();
    }

  }
}