001 /* ActivationException.java -- general Activation exception 002 Copyright (c) 1996, 1997, 1998, 1999, 2002 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 package 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 */ 047 public 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 }