1 /* 2 * Copyright (c) 2004, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 */ 23 24 /* 25 * @test 26 * @bug 5040740 27 * @summary annotations cause memory leak 28 * @author gafter 29 * 30 * @run shell LoaderLeak.sh 31 */ 32 33 import java.net.*; 34 import java.lang.ref.*; 35 import java.util.*; 36 import java.io.*; 37 38 public class Main { 39 public static void main(String[] args) throws Exception { 40 for (int i=0; i<100; i++) 41 doTest(args.length != 0); 42 } 43 44 static void doTest(boolean readAnn) throws Exception { 45 // URL classes = new URL("file://" + System.getProperty("user.dir") + "/classes"); 46 // URL[] path = { classes }; 47 // URLClassLoader loader = new URLClassLoader(path); 48 ClassLoader loader = new SimpleClassLoader(); 49 WeakReference<Class<?>> c = new WeakReference(loader.loadClass("C")); 50 if (c.get() == null) throw new AssertionError(); 51 if (c.get().getClassLoader() != loader) throw new AssertionError(); 52 if (readAnn) System.out.println(c.get().getAnnotations()[0]); 53 if (c.get() == null) throw new AssertionError(); 54 System.gc(); 55 System.gc(); 56 if (c.get() == null) throw new AssertionError(); 57 System.gc(); 58 System.gc(); 59 loader = null; 60 System.gc(); 61 System.gc(); 62 if (c.get() != null) throw new AssertionError(); 63 } 64 } 65 66 class SimpleClassLoader extends ClassLoader { 67 private Hashtable classes = new Hashtable(); 68 69 public SimpleClassLoader() { 70 } 71 private byte getClassImplFromDataBase(String className)[] { 72 byte result[]; 73 try { 74 FileInputStream fi = new FileInputStream("classes/"+className+".class"); 75 result = new byte[fi.available()]; 76 fi.read(result); 77 return result; 78 } catch (Exception e) { 79 80 /* 81 * If we caught an exception, either the class wasnt found or it 82 * was unreadable by our process. 83 */ 84 return null; 85 } 86 } 87 public Class loadClass(String className) throws ClassNotFoundException { 88 return (loadClass(className, true)); 89 } 90 public synchronized Class loadClass(String className, boolean resolveIt) 91 throws ClassNotFoundException { 92 Class result; 93 byte classData[]; 94 95 /* Check our local cache of classes */ 96 result = (Class)classes.get(className); 97 if (result != null) { 98 return result; 99 } 100 101 /* Check with the primordial class loader */ 102 try { 103 result = super.findSystemClass(className); 104 return result; 105 } catch (ClassNotFoundException e) { 106 } 107 108 /* Try to load it from our repository */ 109 classData = getClassImplFromDataBase(className); 110 if (classData == null) { 111 throw new ClassNotFoundException(); 112 } 113 114 /* Define it (parse the class file) */ 115 result = defineClass(classData, 0, classData.length); 116 if (result == null) { 117 throw new ClassFormatError(); 118 } 119 120 if (resolveIt) { 121 resolveClass(result); 122 } 123 124 classes.put(className, result); 125 return result; 126 } 127 }