001 /* 002 * Licensed to the Apache Software Foundation (ASF) under one or more 003 * contributor license agreements. See the NOTICE file distributed with 004 * this work for additional information regarding copyright ownership. 005 * The ASF licenses this file to You under the Apache License, Version 2.0 006 * (the "License"); you may not use this file except in compliance with 007 * the License. You may obtain a copy of the License at 008 * 009 * http://www.apache.org/licenses/LICENSE-2.0 010 * 011 * Unless required by applicable law or agreed to in writing, software 012 * distributed under the License is distributed on an "AS IS" BASIS, 013 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 014 * See the License for the specific language governing permissions and 015 * limitations under the License. 016 */ 017 package org.apache.commons.discovery; 018 019 020 /** 021 * <p>An exception that is thrown only if a suitable service 022 * instance cannot be created by <code>ServiceFactory</code></p> 023 * 024 * <p>Copied from LogConfigurationException<p> 025 * 026 * @author Craig R. McClanahan 027 * @version $Revision: 480374 $ $Date: 2006-11-29 04:33:25 +0100 (Mi, 29. Nov 2006) $ 028 */ 029 public class DiscoveryException extends RuntimeException { 030 031 032 /** 033 * Construct a new exception with <code>null</code> as its detail message. 034 */ 035 public DiscoveryException() { 036 super(); 037 } 038 039 /** 040 * Construct a new exception with the specified detail message. 041 * 042 * @param message The detail message 043 */ 044 public DiscoveryException(String message) { 045 super(message); 046 } 047 048 /** 049 * Construct a new exception with the specified cause and a derived 050 * detail message. 051 * 052 * @param cause The underlying cause 053 */ 054 public DiscoveryException(Throwable cause) { 055 this((cause == null) ? null : cause.toString(), cause); 056 } 057 058 /** 059 * Construct a new exception with the specified detail message and cause. 060 * 061 * @param message The detail message 062 * @param cause The underlying cause 063 */ 064 public DiscoveryException(String message, Throwable cause) { 065 super(message); 066 this.cause = cause; // Two-argument version requires JDK 1.4 or later 067 } 068 069 /** 070 * The underlying cause of this exception. 071 */ 072 protected Throwable cause = null; 073 074 /** 075 * Return the underlying cause of this exception (if any). 076 */ 077 public Throwable getCause() { 078 return this.cause; 079 } 080 081 public String toString() { 082 String ls = System.getProperty("line.separator"); 083 String str = super.toString(); 084 if (cause != null) { 085 str = str + ls + 086 "*****" + ls + 087 stackToString(cause); 088 } 089 return str; 090 } 091 092 private static String stackToString(Throwable e){ 093 java.io.StringWriter sw= new java.io.StringWriter(1024); 094 java.io.PrintWriter pw= new java.io.PrintWriter(sw); 095 e.printStackTrace(pw); 096 pw.close(); 097 return sw.toString(); 098 } 099 }