Source for java.lang.ClassNotFoundException

   1: /* ClassNotFoundException.java -- thrown when class definition cannot be found
   2:    Copyright (C) 1998, 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 a class is requested by reflection, but the class definition
  43:  * cannot be found. This exception is often chained from another Throwable.
  44:  *
  45:  * @author Brian Jones
  46:  * @author Eric Blake (ebb9@email.byu.edu)
  47:  * @see Class#forName(String)
  48:  * @see ClassLoader#findSystemClass(String)
  49:  * @see ClassLoader#loadClass(String, boolean)
  50:  * @status updated to 1.4
  51:  */
  52: public class ClassNotFoundException extends Exception
  53: {
  54:   /**
  55:    * Compatible with JDK 1.0+.
  56:    */
  57:   private static final long serialVersionUID = 9176873029745254542L;
  58: 
  59:   /**
  60:    * The cause of this exception (duplicates the one stored in Throwable).
  61:    *
  62:    * @serial the exception cause
  63:    * @since 1.2
  64:    */
  65:   private final Throwable ex;
  66: 
  67:   /**
  68:    * Create an exception without a message. Note that this initializes the
  69:    * cause to null.
  70:    */
  71:   public ClassNotFoundException()
  72:   {
  73:     this(null);
  74:   }
  75: 
  76:   /**
  77:    * Create an exception with a message. Note that this initializes the
  78:    * cause to null.
  79:    *
  80:    * @param s the message
  81:    */
  82:   public ClassNotFoundException(String s)
  83:   {
  84:     super(s);
  85:     ex = null;
  86:   }
  87: 
  88:   /**
  89:    * Create an exception with a message and chain it to the exception
  90:    * which occurred while loading the class.
  91:    *
  92:    * @param s the message
  93:    * @param ex the chained exception
  94:    * @since 1.2
  95:    */
  96:   public ClassNotFoundException(String s, Throwable ex)
  97:   {
  98:     super(s, ex);
  99:     this.ex = ex;
 100:   }
 101: 
 102:   /**
 103:    * Returns the exception which occurred while loading the class,
 104:    * otherwise returns null. This is a legacy method; the preferred choice
 105:    * now is {@link Throwable#getCause()}.
 106:    *
 107:    * @return the cause of this exception
 108:    * @since 1.2
 109:    */
 110:   public Throwable getException()
 111:   {
 112:     return ex;
 113:   }
 114: 
 115:   /**
 116:    * Returns the exception which occurred while loading the class,
 117:    * otherwise returns null.
 118:    *
 119:    * @return the cause of this exception
 120:    * @since 1.4
 121:    */
 122:   public Throwable getCause()
 123:   {
 124:     return ex;
 125:   }
 126: }