001 /* UndeclaredThrowableException.java -- wraps an undeclared checked exception 002 thrown by a Proxy invocation handler 003 Copyright (C) 2001, 2002, 2005 Free Software Foundation, Inc. 004 005 This file is part of GNU Classpath. 006 007 GNU Classpath is free software; you can redistribute it and/or modify 008 it under the terms of the GNU General Public License as published by 009 the Free Software Foundation; either version 2, or (at your option) 010 any later version. 011 012 GNU Classpath is distributed in the hope that it will be useful, but 013 WITHOUT ANY WARRANTY; without even the implied warranty of 014 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 015 General Public License for more details. 016 017 You should have received a copy of the GNU General Public License 018 along with GNU Classpath; see the file COPYING. If not, write to the 019 Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 020 02110-1301 USA. 021 022 Linking this library statically or dynamically with other modules is 023 making a combined work based on this library. Thus, the terms and 024 conditions of the GNU General Public License cover the whole 025 combination. 026 027 As a special exception, the copyright holders of this library give you 028 permission to link this library with independent modules to produce an 029 executable, regardless of the license terms of these independent 030 modules, and to copy and distribute the resulting executable under 031 terms of your choice, provided that you also meet, for each linked 032 independent module, the terms and conditions of the license of that 033 module. An independent module is a module which is not derived from 034 or based on this library. If you modify this library, you may extend 035 this exception to your version of the library, but you are not 036 obligated to do so. If you do not wish to do so, delete this 037 exception statement from your version. */ 038 039 040 package java.lang.reflect; 041 042 /** 043 * This exception class is thrown by a {@link Proxy} instance if 044 * the {@link InvocationHandler#invoke(Object, Method, Object[]) invoke} 045 * method of that instance's InvocationHandler attempts to throw an 046 * exception that not declared by the throws clauses of all of the 047 * interface methods that the proxy instance is implementing. 048 * 049 * <p>When thrown by Proxy, this class will always wrap a checked 050 * exception, never {@link Error} or {@link RuntimeException}, 051 * which are unchecked. 052 * 053 * @author Eric Blake (ebb9@email.byu.edu) 054 * @see Proxy 055 * @see InvocationHandler 056 * @since 1.3 057 * @status updated to 1.4 058 */ 059 public class UndeclaredThrowableException extends RuntimeException 060 { 061 /** 062 * Compatible with JDK 1.3+. 063 */ 064 private static final long serialVersionUID = 330127114055056639L; 065 066 /** 067 * The immutable exception that this wraps. This field is redundant 068 * with {@link Throwable#getCause()}, but is necessary for serial compatibility. 069 * 070 * @serial the chained exception 071 */ 072 private final Throwable undeclaredThrowable; 073 074 /** 075 * Wraps the given checked exception into a RuntimeException, with no 076 * detail message. {@link Throwable#initCause(Throwable)} will fail 077 * on this instance. 078 * 079 * @param cause the undeclared throwable that caused this exception, 080 * may be null 081 */ 082 public UndeclaredThrowableException(Throwable cause) 083 { 084 this(cause, null); 085 } 086 087 /** 088 * Wraps the given checked exception into a RuntimeException, with the 089 * specified detail message. {@link Throwable#initCause(Throwable)} will 090 * fail on this instance. 091 * 092 * @param cause the undeclared throwable that caused this exception, 093 * may be null 094 * @param message the message, may be null 095 */ 096 public UndeclaredThrowableException(Throwable cause, String message) 097 { 098 super(message, cause); 099 undeclaredThrowable = cause; 100 } 101 102 /** 103 * Returns the cause of this exception. If this exception was created 104 * by a {@link Proxy} instance, it will be a non-null checked 105 * exception. This method pre-dates exception chaining, and is now 106 * simply a longer way to call <code>getCause()</code>. 107 * 108 * @return the cause of this exception, may be null 109 * @see #getCause() 110 */ 111 public Throwable getUndeclaredThrowable() 112 { 113 return undeclaredThrowable; 114 } 115 116 /** 117 * Returns the cause of this exception. If this exception was created 118 * by a {@link Proxy} instance, it will be a non-null checked 119 * exception. 120 * 121 * @return the cause of this exception, may be null 122 * @since 1.4 123 */ 124 public Throwable getCause() 125 { 126 return undeclaredThrowable; 127 } 128 }