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 */ ClassNotFoundException()71 public ClassNotFoundException() 72 { 73 this(null, 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 */ ClassNotFoundException(String s)82 public ClassNotFoundException(String s) 83 { 84 this(s, null); 85 } 86 87 /** 88 * Create an exception with a message and chain it to the exception 89 * which occurred while loading the class. 90 * 91 * @param s the message 92 * @param ex the chained exception 93 * @since 1.2 94 */ ClassNotFoundException(String s, Throwable ex)95 public ClassNotFoundException(String s, Throwable ex) 96 { 97 super(s, ex); 98 this.ex = ex; 99 } 100 101 /** 102 * Returns the exception which occurred while loading the class, 103 * otherwise returns null. This is a legacy method; the preferred choice 104 * now is {@link Throwable#getCause()}. 105 * 106 * @return the cause of this exception 107 * @since 1.2 108 */ getException()109 public Throwable getException() 110 { 111 return ex; 112 } 113 114 /** 115 * Returns the exception which occurred while loading the class, 116 * otherwise returns null. 117 * 118 * @return the cause of this exception 119 * @since 1.4 120 */ getCause()121 public Throwable getCause() 122 { 123 return ex; 124 } 125 } 126