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: 706640 $ $Date: 2008-10-21 14:44:05 +0000 (Tue, 21 Oct 2008) $
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 }