136 lines
4.4 KiB
Java
136 lines
4.4 KiB
Java
/*
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* Copyright (c) 2004, 2012, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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/*
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* @test
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* @bug 5040740
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* @summary annotations cause memory leak
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* @author gafter
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*
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* @run shell LoaderLeak.sh
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*/
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import java.net.*;
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import java.lang.ref.*;
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import java.util.*;
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import java.io.*;
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public class Main {
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public static void main(String[] args) throws Exception {
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for (int i=0; i<100; i++)
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doTest(args.length != 0);
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}
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static void doTest(boolean readAnn) throws Exception {
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// URL classes = new URL("file://" + System.getProperty("user.dir") + "/classes");
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// URL[] path = { classes };
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// URLClassLoader loader = new URLClassLoader(path);
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ClassLoader loader = new SimpleClassLoader();
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WeakReference<Class<?>> c = new WeakReference(loader.loadClass("C"));
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if (c.get() == null) throw new AssertionError();
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if (c.get().getClassLoader() != loader) throw new AssertionError();
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if (readAnn) System.out.println(c.get().getAnnotations()[0]);
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if (c.get() == null) throw new AssertionError();
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System.gc();
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System.gc();
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if (c.get() == null) throw new AssertionError();
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System.gc();
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System.gc();
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loader = null;
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// Might require multiple calls to System.gc() for weak-references
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// processing to be complete. If the weak-reference is not cleared as
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// expected we will hang here until timed out by the test harness.
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while (true) {
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System.gc();
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Thread.sleep(20);
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if (c.get() == null) {
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break;
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}
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}
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}
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}
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class SimpleClassLoader extends ClassLoader {
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private Hashtable classes = new Hashtable();
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public SimpleClassLoader() {
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}
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private byte getClassImplFromDataBase(String className)[] {
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byte result[];
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try {
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FileInputStream fi = new FileInputStream("classes/"+className+".class");
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result = new byte[fi.available()];
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fi.read(result);
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return result;
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} catch (Exception e) {
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/*
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* If we caught an exception, either the class wasnt found or it
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* was unreadable by our process.
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*/
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return null;
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}
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}
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public Class loadClass(String className) throws ClassNotFoundException {
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return (loadClass(className, true));
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}
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public synchronized Class loadClass(String className, boolean resolveIt)
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throws ClassNotFoundException {
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Class result;
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byte classData[];
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/* Check our local cache of classes */
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result = (Class)classes.get(className);
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if (result != null) {
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return result;
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}
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/* Check with the primordial class loader */
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try {
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result = super.findSystemClass(className);
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return result;
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} catch (ClassNotFoundException e) {
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}
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/* Try to load it from our repository */
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classData = getClassImplFromDataBase(className);
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if (classData == null) {
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throw new ClassNotFoundException();
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}
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/* Define it (parse the class file) */
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result = defineClass(classData, 0, classData.length);
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if (result == null) {
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throw new ClassFormatError();
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}
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if (resolveIt) {
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resolveClass(result);
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}
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classes.put(className, result);
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return result;
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}
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}
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