01 /* 02 * Copyright 2002-2004 the original author or authors. 03 * 04 * Licensed under the Apache License, Version 2.0 (the "License"); 05 * you may not use this file except in compliance with the License. 06 * You may obtain a copy of the License at 07 * 08 * http://www.apache.org/licenses/LICENSE-2.0 09 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 package org.springframework.util; 18 19 /** 20 * Utility class for diagnostic purposes, to analyze the 21 * ClassLoader hierarchy for any object. 22 * @author Rod Johnson 23 * @since 02 April 2001 24 * @see java.lang.ClassLoader 25 */ 26 public abstract class ClassLoaderUtils { 27 28 /** 29 * Show the class loader hierarchy for this class. 30 * @param obj object to analyze loader hierarchy for 31 * @param role a description of the role of this class in the application 32 * (e.g., "servlet" or "EJB reference") 33 * @param delim line break 34 * @param tabText text to use to set tabs 35 * @return a String showing the class loader hierarchy for this class 36 */ 37 public static String showClassLoaderHierarchy(Object obj, String role, String delim, String tabText) { 38 String s = "object of " + obj.getClass() + ": role is " + role + delim; 39 return s + showClassLoaderHierarchy(obj.getClass().getClassLoader(), delim, tabText, 0); 40 } 41 42 /** 43 * Show the class loader hierarchy for this class. 44 * @param cl class loader to analyze hierarchy for 45 * @param delim line break 46 * @param tabText text to use to set tabs 47 * @param indent nesting level (from 0) of this loader; used in pretty printing 48 * @return a String showing the class loader hierarchy for this class 49 */ 50 public static String showClassLoaderHierarchy(ClassLoader cl, String delim, String tabText, int indent) { 51 if (cl == null) { 52 String s = "null classloader " + delim; Rate53 ClassLoader ctxcl = Thread.currentThread().getContextClassLoader(); 54 s += "Context class loader=" + ctxcl + " hc=" + ctxcl.hashCode(); 55 return s; 56 } 57 String s = ""; 58 for (int i = 0; i < indent; i++) { 59 s += tabText; 60 } 61 s += cl + " hc=" + cl.hashCode() + delim; 62 ClassLoader parent = cl.getParent(); 63 return s + showClassLoaderHierarchy(parent, delim, tabText, indent + 1); 64 } 65 66 }