1 /* 2 * Copyright (c) 2004, 2012, 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 61 // Might require multiple calls to System.gc() for weak-references 62 // processing to be complete. If the weak-reference is not cleared as 63 // expected we will hang here until timed out by the test harness. 64 while (true) { 65 System.gc(); 66 Thread.sleep(20); 67 if (c.get() == null) { 68 break; 69 } 70 } 71 } 72 } 73 74 class SimpleClassLoader extends ClassLoader { 75 private Hashtable classes = new Hashtable(); 76 77 public SimpleClassLoader() { 78 } 79 private byte getClassImplFromDataBase(String className)[] { 80 byte result[]; 81 try { 82 FileInputStream fi = new FileInputStream("classes/"+className+".class"); 83 result = new byte[fi.available()]; 84 fi.read(result); 85 return result; 86 } catch (Exception e) { 87 88 /* 89 * If we caught an exception, either the class wasnt found or it 90 * was unreadable by our process. 91 */ 92 return null; 93 } 94 } 95 public Class loadClass(String className) throws ClassNotFoundException { 96 return (loadClass(className, true)); 97 } 98 public synchronized Class loadClass(String className, boolean resolveIt) 99 throws ClassNotFoundException { 100 Class result; 101 byte classData[]; 102 103 /* Check our local cache of classes */ 104 result = (Class)classes.get(className); 105 if (result != null) { 106 return result; 107 } 108 109 /* Check with the primordial class loader */ 110 try { 111 result = super.findSystemClass(className); 112 return result; 113 } catch (ClassNotFoundException e) { 114 } 115 116 /* Try to load it from our repository */ 117 classData = getClassImplFromDataBase(className); 118 if (classData == null) { 119 throw new ClassNotFoundException(); 120 } 121 122 /* Define it (parse the class file) */ 123 result = defineClass(classData, 0, classData.length); 124 if (result == null) { 125 throw new ClassFormatError(); 126 } 127 128 if (resolveIt) { 129 resolveClass(result); 130 } 131 132 classes.put(className, result); 133 return result; 134 } 135 }