221 lines
9.5 KiB
Java
221 lines
9.5 KiB
Java
/*
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* Copyright (c) 2014, 2022, Oracle and/or its affiliates. All rights reserved.
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* Copyright (c) 2018 SAP SE. 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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* @summary Test of diagnostic command VM.classloaders
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* @library /test/lib
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* @modules java.base/jdk.internal.misc
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* jdk.compiler
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* jdk.internal.jvmstat/sun.jvmstat.monitor
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* @run testng ClassLoaderHierarchyTest
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*/
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import org.testng.Assert;
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import org.testng.annotations.Test;
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import jdk.test.lib.process.OutputAnalyzer;
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import jdk.test.lib.dcmd.CommandExecutor;
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import jdk.test.lib.dcmd.JMXExecutor;
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import java.io.File;
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import java.io.FileInputStream;
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import java.io.IOException;
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import java.nio.ByteBuffer;
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import java.nio.channels.FileChannel;
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import java.lang.ref.Reference;
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public class ClassLoaderHierarchyTest {
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class EmptyDelegatingLoader extends ClassLoader {
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EmptyDelegatingLoader(String name, ClassLoader parent) {
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super(name, parent);
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}
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}
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static void loadTestClassInLoaderAndCheck(String classname, ClassLoader loader) throws ClassNotFoundException {
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Class<?> c = Class.forName(classname, true, loader);
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if (c.getClassLoader() != loader) {
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Assert.fail(classname + " defined by wrong classloader: " + c.getClassLoader());
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}
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}
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//+-- <bootstrap>
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// |
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// +-- "platform", jdk.internal.loader.ClassLoaders$PlatformClassLoader
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// | |
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// | +-- "app", jdk.internal.loader.ClassLoaders$AppClassLoader
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// |
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// +-- ClassLoaderHierarchyTest$TestClassLoader
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// |
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// +-- "Bill", ClassLoaderHierarchyTest$TestClassLoader
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public void run(CommandExecutor executor) throws ClassNotFoundException {
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// A) one unnamed, two named loaders
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ClassLoader unnamed_cl = new TestClassLoader(null, null);
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ClassLoader named_cl = new TestClassLoader("Kevin", null);
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ClassLoader named_child_cl = new TestClassLoader("Bill", unnamed_cl);
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loadTestClassInLoaderAndCheck("TestClass2", unnamed_cl);
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loadTestClassInLoaderAndCheck("TestClass2", named_cl);
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loadTestClassInLoaderAndCheck("TestClass2", named_child_cl);
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// B) A named CL with empty loaders as parents (JDK-8293156)
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EmptyDelegatingLoader emptyLoader1 = new EmptyDelegatingLoader("EmptyLoader1", null);
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EmptyDelegatingLoader emptyLoader2 = new EmptyDelegatingLoader("EmptyLoader2", emptyLoader1);
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ClassLoader named_child_2_cl = new TestClassLoader("Child2", emptyLoader2);
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loadTestClassInLoaderAndCheck("TestClass2", named_child_2_cl);
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// C) Test output for several class loaders, same class, same name, empty parents,
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// and all these should be folded by default.
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EmptyDelegatingLoader emptyLoader3 = new EmptyDelegatingLoader("EmptyLoader3", null);
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EmptyDelegatingLoader emptyLoader4 = new EmptyDelegatingLoader("EmptyLoader4", emptyLoader3);
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ClassLoader named_child_3_cl = new TestClassLoader("ChildX", emptyLoader4); // Same names
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ClassLoader named_child_4_cl = new TestClassLoader("ChildX", emptyLoader4);
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ClassLoader named_child_5_cl = new TestClassLoader("ChildX", emptyLoader4);
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ClassLoader named_child_6_cl = new TestClassLoader("ChildX", emptyLoader4);
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loadTestClassInLoaderAndCheck("TestClass2", named_child_3_cl);
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loadTestClassInLoaderAndCheck("TestClass2", named_child_4_cl);
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loadTestClassInLoaderAndCheck("TestClass2", named_child_5_cl);
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loadTestClassInLoaderAndCheck("TestClass2", named_child_6_cl);
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// D) Test output for several *unnamed* class loaders, same class, same parents,
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// and all these should be folded by default too.
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EmptyDelegatingLoader emptyLoader5 = new EmptyDelegatingLoader(null, null);
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EmptyDelegatingLoader emptyLoader6 = new EmptyDelegatingLoader(null, emptyLoader5);
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ClassLoader named_child_7_cl = new TestClassLoader(null, emptyLoader6); // Same names
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ClassLoader named_child_8_cl = new TestClassLoader(null, emptyLoader6);
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ClassLoader named_child_9_cl = new TestClassLoader(null, emptyLoader6);
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ClassLoader named_child_10_cl = new TestClassLoader(null, emptyLoader6);
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loadTestClassInLoaderAndCheck("TestClass2", named_child_7_cl);
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loadTestClassInLoaderAndCheck("TestClass2", named_child_8_cl);
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loadTestClassInLoaderAndCheck("TestClass2", named_child_9_cl);
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loadTestClassInLoaderAndCheck("TestClass2", named_child_10_cl);
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// First test: simple output, no classes displayed
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OutputAnalyzer output = executor.execute("VM.classloaders");
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// (A)
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output.shouldContain("+-- <bootstrap>");
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output.shouldContain(" +-- \"platform\", jdk.internal.loader.ClassLoaders$PlatformClassLoader");
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output.shouldContain(" | +-- \"app\", jdk.internal.loader.ClassLoaders$AppClassLoader");
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output.shouldContain(" +-- \"Kevin\", ClassLoaderHierarchyTest$TestClassLoader");
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output.shouldContain(" +-- ClassLoaderHierarchyTest$TestClassLoader");
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output.shouldContain(" | +-- \"Bill\", ClassLoaderHierarchyTest$TestClassLoader");
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// (B)
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output.shouldContain(" +-- \"EmptyLoader1\", ClassLoaderHierarchyTest$EmptyDelegatingLoader");
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output.shouldContain(" | +-- \"EmptyLoader2\", ClassLoaderHierarchyTest$EmptyDelegatingLoader");
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output.shouldContain(" | +-- \"Child2\", ClassLoaderHierarchyTest$TestClassLoader");
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// (C)
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output.shouldContain(" +-- \"EmptyLoader3\", ClassLoaderHierarchyTest$EmptyDelegatingLoader");
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output.shouldContain(" | +-- \"EmptyLoader4\", ClassLoaderHierarchyTest$EmptyDelegatingLoader");
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output.shouldContain(" | +-- \"ChildX\", ClassLoaderHierarchyTest$TestClassLoader (+ 3 more)");
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// (D)
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output.shouldContain(" +-- ClassLoaderHierarchyTest$EmptyDelegatingLoader");
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output.shouldContain(" +-- ClassLoaderHierarchyTest$EmptyDelegatingLoader");
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output.shouldContain(" +-- ClassLoaderHierarchyTest$TestClassLoader (+ 3 more)");
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// Second test: print with classes.
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output = executor.execute("VM.classloaders show-classes");
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output.shouldContain("<bootstrap>");
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output.shouldContain("java.lang.Object");
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output.shouldContain("java.lang.Enum");
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output.shouldContain("java.lang.NullPointerException");
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output.shouldContain("TestClass2");
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output.shouldContain("Hidden Classes:");
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Reference.reachabilityFence(unnamed_cl);
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Reference.reachabilityFence(named_cl);
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Reference.reachabilityFence(named_child_cl);
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}
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static class TestClassLoader extends ClassLoader {
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public TestClassLoader() {
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super();
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}
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public TestClassLoader(String name, ClassLoader parent) {
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super(name, parent);
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}
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public static final String CLASS_NAME = "TestClass2";
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static ByteBuffer readClassFile(String name)
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{
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File f = new File(System.getProperty("test.classes", "."),
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name);
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try (FileInputStream fin = new FileInputStream(f);
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FileChannel fc = fin.getChannel())
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{
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return fc.map(FileChannel.MapMode.READ_ONLY, 0, fc.size());
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} catch (IOException e) {
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Assert.fail("Can't open file: " + name, e);
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}
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/* Will not reach here as Assert.fail() throws exception */
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return null;
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}
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protected Class<?> loadClass(String name, boolean resolve)
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throws ClassNotFoundException
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{
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Class<?> c;
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if (!CLASS_NAME.equals(name)) {
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c = super.loadClass(name, resolve);
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} else {
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// should not delegate to the system class loader
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c = findClass(name);
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if (resolve) {
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resolveClass(c);
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}
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}
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return c;
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}
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protected Class<?> findClass(String name)
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throws ClassNotFoundException
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{
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if (!CLASS_NAME.equals(name)) {
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throw new ClassNotFoundException("Unexpected class: " + name);
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}
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return defineClass(name, readClassFile(name + ".class"), null);
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}
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}
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@Test
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public void jmx() throws ClassNotFoundException {
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run(new JMXExecutor());
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}
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}
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class TestClass2 {
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static {
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Runnable r = () -> System.out.println("Hello");
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r.run();
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}
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}
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