Source for java.lang.NullPointerException

   1: /* NullPointerException.java -- thrown when using null instead of an object
   2:    Copyright (C) 1998, 1999, 2001, 2002, 2005  Free Software Foundation, Inc.
   3: 
   4: This file is part of GNU Classpath.
   5: 
   6: GNU Classpath is free software; you can redistribute it and/or modify
   7: it under the terms of the GNU General Public License as published by
   8: the Free Software Foundation; either version 2, or (at your option)
   9: any later version.
  10: 
  11: GNU Classpath is distributed in the hope that it will be useful, but
  12: WITHOUT ANY WARRANTY; without even the implied warranty of
  13: MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14: General Public License for more details.
  15: 
  16: You should have received a copy of the GNU General Public License
  17: along with GNU Classpath; see the file COPYING.  If not, write to the
  18: Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
  19: 02110-1301 USA.
  20: 
  21: Linking this library statically or dynamically with other modules is
  22: making a combined work based on this library.  Thus, the terms and
  23: conditions of the GNU General Public License cover the whole
  24: combination.
  25: 
  26: As a special exception, the copyright holders of this library give you
  27: permission to link this library with independent modules to produce an
  28: executable, regardless of the license terms of these independent
  29: modules, and to copy and distribute the resulting executable under
  30: terms of your choice, provided that you also meet, for each linked
  31: independent module, the terms and conditions of the license of that
  32: module.  An independent module is a module which is not derived from
  33: or based on this library.  If you modify this library, you may extend
  34: this exception to your version of the library, but you are not
  35: obligated to do so.  If you do not wish to do so, delete this
  36: exception statement from your version. */
  37: 
  38: 
  39: package java.lang;
  40: 
  41: /**
  42:  * Thrown when attempting to use <code>null</code> where an object
  43:  * is required. The Virtual Machine automatically throws this exception
  44:  * for the following:<br><ul>
  45:  * <li>Calling an instance method on a null object</li>
  46:  * <li>Accessing or modifying a field of a null object</li>
  47:  * <li>Taking the array length of a null array</li>
  48:  * <li>Accessing or modifying the slots of a null array</li>
  49:  * <li>Throwing a null Throwable</li>
  50:  * <li>Synchronizing on a null object</li>
  51:  * </ul>
  52:  * <p>Applications should also throw NullPointerExceptions whenever
  53:  * <code>null</code> is an inappropriate parameter to a method.
  54:  *
  55:  * @author Brian Jones
  56:  * @author Warren Levy (warrenl@cygnus.com)
  57:  * @status updated to 1.4
  58:  */
  59: public class NullPointerException extends RuntimeException
  60: {
  61:   /**
  62:    * Compatible with JDK 1.0+.
  63:    */
  64:   private static final long serialVersionUID = 5162710183389028792L;
  65: 
  66:   /**
  67:    * Create an exception without a message.
  68:    */
  69:   public NullPointerException()
  70:   {
  71:   }
  72: 
  73:   /**
  74:    * Create an exception with a message.
  75:    *
  76:    * @param s the message
  77:    */
  78:   public NullPointerException(String s)
  79:   {
  80:     super(s);
  81:   }
  82: }