001/* ClassNotFoundException.java -- thrown when class definition cannot be found 002 Copyright (C) 1998, 2002, 2005 Free Software Foundation, Inc. 003 004This file is part of GNU Classpath. 005 006GNU Classpath is free software; you can redistribute it and/or modify 007it under the terms of the GNU General Public License as published by 008the Free Software Foundation; either version 2, or (at your option) 009any later version. 010 011GNU Classpath is distributed in the hope that it will be useful, but 012WITHOUT ANY WARRANTY; without even the implied warranty of 013MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 014General Public License for more details. 015 016You should have received a copy of the GNU General Public License 017along with GNU Classpath; see the file COPYING. If not, write to the 018Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 01902110-1301 USA. 020 021Linking this library statically or dynamically with other modules is 022making a combined work based on this library. Thus, the terms and 023conditions of the GNU General Public License cover the whole 024combination. 025 026As a special exception, the copyright holders of this library give you 027permission to link this library with independent modules to produce an 028executable, regardless of the license terms of these independent 029modules, and to copy and distribute the resulting executable under 030terms of your choice, provided that you also meet, for each linked 031independent module, the terms and conditions of the license of that 032module. An independent module is a module which is not derived from 033or based on this library. If you modify this library, you may extend 034this exception to your version of the library, but you are not 035obligated to do so. If you do not wish to do so, delete this 036exception statement from your version. */ 037 038 039package 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 */ 052public 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}