108 lines
3.8 KiB
Java
108 lines
3.8 KiB
Java
/*
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* Copyright (c) 2021, 2022, 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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import java.lang.ref.WeakReference;
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import java.lang.reflect.Constructor;
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import java.io.ByteArrayOutputStream;
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import java.io.InputStream;
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import java.io.ObjectStreamClass;
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import java.io.ObjectStreamField;
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import java.io.Serializable;
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import java.util.Arrays;
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import org.testng.annotations.Test;
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import static org.testng.Assert.assertTrue;
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import static org.testng.Assert.assertFalse;
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import jdk.test.lib.util.ForceGC;
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/* @test
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* @bug 8277072
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* @library /test/lib/
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* @build jdk.test.lib.util.ForceGC
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* @summary ObjectStreamClass caches keep ClassLoaders alive
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* @run testng TestOSCClassLoaderLeak
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*/
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public class TestOSCClassLoaderLeak {
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@Test
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public void testClassLoaderLeak() throws Exception {
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TestClassLoader myOwnClassLoader = new TestClassLoader();
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Class<?> loadClass = myOwnClassLoader.loadClass("ObjectStreamClass_MemoryLeakExample");
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Constructor con = loadClass.getConstructor();
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con.setAccessible(true);
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Object objectStreamClass_MemoryLeakExample = con.newInstance();
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objectStreamClass_MemoryLeakExample.toString();
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WeakReference<Object> myOwnClassLoaderWeakReference = new WeakReference<>(myOwnClassLoader);
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assertFalse(myOwnClassLoaderWeakReference.refersTo(null));
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objectStreamClass_MemoryLeakExample = null;
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myOwnClassLoader = null;
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loadClass = null;
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con = null;
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assertFalse(myOwnClassLoaderWeakReference.refersTo(null));
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assertTrue(ForceGC.wait(() -> myOwnClassLoaderWeakReference.refersTo(null)));
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}
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}
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class ObjectStreamClass_MemoryLeakExample {
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private static final ObjectStreamField[] fields = ObjectStreamClass.lookup(TestClass.class).getFields();
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public ObjectStreamClass_MemoryLeakExample() {
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}
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@Override
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public String toString() {
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return Arrays.toString(fields);
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}
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}
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class TestClassLoader extends ClassLoader {
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@Override
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public Class<?> loadClass(String name) throws ClassNotFoundException {
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if (name.equals("TestClass") || name.equals("ObjectStreamClass_MemoryLeakExample")) {
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byte[] bt = loadClassData(name);
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return defineClass(name, bt, 0, bt.length);
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} else {
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return super.loadClass(name);
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}
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}
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private static byte[] loadClassData(String className) {
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ByteArrayOutputStream byteSt = new ByteArrayOutputStream();
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try (InputStream is = TestClassLoader.class.getClassLoader().getResourceAsStream(className.replace(".", "/") + ".class")) {
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int len = 0;
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while ((len = is.read()) != -1) {
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byteSt.write(len);
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}
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} catch (java.io.IOException e) {
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e.printStackTrace();
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}
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return byteSt.toByteArray();
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}
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}
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class TestClass implements Serializable {
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public String x;
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}
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