001/* ActivationException.java -- general Activation exception 002 Copyright (c) 1996, 1997, 1998, 1999, 2002 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 038package java.rmi.activation; 039 040/** 041 * General exception class for <code>java.rmi.activation</code>. 042 * 043 * @author unknown 044 * @since 1.2 045 * @status updated to 1.4 046 */ 047public class ActivationException extends Exception 048{ 049 /** 050 * Compatible with JDK 1.2+. 051 */ 052 private static final long serialVersionUID = -4320118837291406071L; 053 054 /** 055 * The cause of this exception. This pre-dates the exception chaining 056 * of Throwable; and although you can change this field, you are wiser 057 * to leave it alone. 058 * 059 * @serial the exception cause 060 */ 061 public Throwable detail; 062 063 /** 064 * Create an exception with no message, and cause initialized to null. 065 */ 066 public ActivationException() 067 { 068 this(null, null); 069 } 070 071 /** 072 * Create an exception with the given message, and cause initialized to null. 073 * 074 * @param s the message 075 */ 076 public ActivationException(String s) 077 { 078 this(s, null); 079 } 080 081 /** 082 * Create an exception with the given message and cause. 083 * 084 * @param s the message 085 * @param ex the cause 086 */ 087 public ActivationException(String s, Throwable ex) 088 { 089 super(s, ex); 090 detail = ex; 091 } 092 093 /** 094 * This method returns a message indicating what went wrong, in this 095 * format: 096 * <code>super.getMessage() + (detail == null ? "" 097 * : "; nested exception is:\n\t" + detail)</code>. 098 * 099 * @return the chained message 100 */ 101 public String getMessage() 102 { 103 if (detail == this || detail == null) 104 return super.getMessage(); 105 return super.getMessage() + "; nested exception is:\n\t" + detail; 106 } 107 108 /** 109 * Returns the cause of this exception. Note that this may not be the 110 * original cause, thanks to the <code>detail</code> field being public 111 * and non-final (yuck). However, to avoid violating the contract of 112 * Throwable.getCause(), this returns null if <code>detail == this</code>, 113 * as no exception can be its own cause. 114 * 115 * @return the cause 116 * @since 1.4 117 */ 118 public Throwable getCause() 119 { 120 return detail == this ? null : detail; 121 } 122}