001    /* ClassNotFoundException.java -- thrown when class definition cannot be found
002       Copyright (C) 1998, 2002, 2005  Free Software Foundation, Inc.
003    
004    This file is part of GNU Classpath.
005    
006    GNU Classpath is free software; you can redistribute it and/or modify
007    it under the terms of the GNU General Public License as published by
008    the Free Software Foundation; either version 2, or (at your option)
009    any later version.
010    
011    GNU Classpath is distributed in the hope that it will be useful, but
012    WITHOUT ANY WARRANTY; without even the implied warranty of
013    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
014    General Public License for more details.
015    
016    You should have received a copy of the GNU General Public License
017    along with GNU Classpath; see the file COPYING.  If not, write to the
018    Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
019    02110-1301 USA.
020    
021    Linking this library statically or dynamically with other modules is
022    making a combined work based on this library.  Thus, the terms and
023    conditions of the GNU General Public License cover the whole
024    combination.
025    
026    As a special exception, the copyright holders of this library give you
027    permission to link this library with independent modules to produce an
028    executable, regardless of the license terms of these independent
029    modules, and to copy and distribute the resulting executable under
030    terms of your choice, provided that you also meet, for each linked
031    independent module, the terms and conditions of the license of that
032    module.  An independent module is a module which is not derived from
033    or based on this library.  If you modify this library, you may extend
034    this exception to your version of the library, but you are not
035    obligated to do so.  If you do not wish to do so, delete this
036    exception statement from your version. */
037    
038    
039    package java.lang;
040    
041    /**
042     * Thrown when a class is requested by reflection, but the class definition
043     * cannot be found. This exception is often chained from another Throwable.
044     *
045     * @author Brian Jones
046     * @author Eric Blake (ebb9@email.byu.edu)
047     * @see Class#forName(String)
048     * @see ClassLoader#findSystemClass(String)
049     * @see ClassLoader#loadClass(String, boolean)
050     * @status updated to 1.4
051     */
052    public class ClassNotFoundException extends Exception
053    {
054      /**
055       * Compatible with JDK 1.0+.
056       */
057      private static final long serialVersionUID = 9176873029745254542L;
058    
059      /**
060       * The cause of this exception (duplicates the one stored in Throwable).
061       *
062       * @serial the exception cause
063       * @since 1.2
064       */
065      private final Throwable ex;
066    
067      /**
068       * Create an exception without a message. Note that this initializes the
069       * cause to null.
070       */
071      public ClassNotFoundException()
072      {
073        this(null);
074      }
075    
076      /**
077       * Create an exception with a message. Note that this initializes the
078       * cause to null.
079       *
080       * @param s the message
081       */
082      public ClassNotFoundException(String s)
083      {
084        super(s);
085        ex = null;
086      }
087    
088      /**
089       * Create an exception with a message and chain it to the exception
090       * which occurred while loading the class.
091       *
092       * @param s the message
093       * @param ex the chained exception
094       * @since 1.2
095       */
096      public ClassNotFoundException(String s, Throwable ex)
097      {
098        super(s, ex);
099        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    }