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.geronimo.kernel.util; 018 019 import java.net.URLClassLoader; 020 import java.net.URL; 021 import org.apache.geronimo.kernel.config.MultiParentClassLoader; 022 023 /** 024 * Shows the ID and contents of a ClassLoader 025 * 026 * @version $Rev: 476049 $ $Date: 2006-11-16 23:35:17 -0500 (Thu, 16 Nov 2006) $ 027 */ 028 public class ClassLoaderDumper { 029 public static void dump(Object o) { 030 if(o != null) dump(o.getClass().getClassLoader()); 031 } 032 public static void dump(Class cls) { 033 System.out.println("ClassLoader dump for "+cls.getName()); 034 dump(cls.getClassLoader()); 035 } 036 public static void dump(ClassLoader loader) { 037 dumpIDs("", loader); 038 dumpContents("", loader); 039 } 040 private static void dumpIDs(String prefix, ClassLoader loader) { 041 if(loader == null) return; 042 System.out.println(prefix+"ClassLoader is "+loader); 043 044 if(loader instanceof MultiParentClassLoader) { 045 MultiParentClassLoader mp = (MultiParentClassLoader) loader; 046 ClassLoader[] parents = mp.getParents(); 047 for (int i = 0; i < parents.length; i++) { 048 dumpIDs(prefix+" ", parents[i]); 049 } 050 } else { 051 dumpIDs(prefix+" ", loader.getParent()); 052 } 053 } 054 private static void dumpContents(String prefix, ClassLoader loader) { 055 if(loader == null) return; 056 System.out.println(prefix+"ClassLoader is "+loader); 057 058 if(loader instanceof URLClassLoader) { 059 URLClassLoader url = (URLClassLoader) loader; 060 URL[] entries = url.getURLs(); 061 for (int i = 0; i < entries.length; i++) { 062 URL entry = entries[i]; 063 System.out.println(prefix+" "+entry); 064 } 065 } 066 if(loader instanceof MultiParentClassLoader) { 067 MultiParentClassLoader mp = (MultiParentClassLoader) loader; 068 ClassLoader[] parents = mp.getParents(); 069 for (int i = 0; i < parents.length; i++) { 070 dumpContents(prefix+" ", parents[i]); 071 } 072 } else { 073 dumpContents(prefix+" ", loader.getParent()); 074 } 075 } 076 }