131 lines
4.4 KiB
Java
131 lines
4.4 KiB
Java
/*
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* Copyright (c) 2017, 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 8164512 8191360
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* @requires vm.compMode != "Xcomp"
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* @summary verify if the native library is unloaded when the class loader is GC'ed
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* @build p.Test
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* @run main/othervm/native -Xcheck:jni NativeLibraryTest
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*/
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import java.io.IOException;
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import java.net.MalformedURLException;
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import java.net.URL;
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import java.net.URLClassLoader;
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import java.nio.file.Files;
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import java.nio.file.Path;
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import java.nio.file.Paths;
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public class NativeLibraryTest {
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static final Path CLASSES = Paths.get("classes");
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static int unloadedCount = 0;
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/*
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* Called by JNI_OnUnload when the native library is unloaded
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*/
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static void nativeLibraryUnloaded() {
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unloadedCount++;
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}
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public static void main(String... args) throws Exception {
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setup();
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for (int count=1; count <= 5; count++) {
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// create a class loader and load a native library
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runTest();
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// unloading the class loader and native library
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System.gc();
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// give Cleaner thread a chance to unload the native library
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Thread.sleep(100);
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// unloadedCount is incremented when the native library is unloaded
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if (count != unloadedCount) {
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throw new RuntimeException("Expected unloaded=" + count +
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" but got=" + unloadedCount);
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}
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}
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}
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/*
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* Loads p.Test class with a new class loader and its static initializer
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* will load a native library.
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*
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* The class loader becomes unreachable when this method returns and
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* the native library should be unloaded at some point after the class
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* loader is garbage collected.
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*/
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static void runTest() throws Exception {
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// invoke p.Test.run() that loads the native library
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Runnable r = newTestRunnable();
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r.run();
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// reload the native library by the same class loader
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r.run();
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// load the native library by another class loader
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Runnable r1 = newTestRunnable();
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try {
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r1.run();
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throw new RuntimeException("should fail to load the native library" +
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" by another class loader");
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} catch (UnsatisfiedLinkError e) {}
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}
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/*
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* Loads p.Test class with a new class loader and returns
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* a Runnable instance.
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*/
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static Runnable newTestRunnable() throws Exception {
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TestLoader loader = new TestLoader();
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Class<?> c = Class.forName("p.Test", true, loader);
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return (Runnable) c.newInstance();
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}
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static class TestLoader extends URLClassLoader {
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static URL[] toURLs() {
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try {
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return new URL[] { CLASSES.toUri().toURL() };
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} catch (MalformedURLException e) {
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throw new Error(e);
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}
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}
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TestLoader() {
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super("testloader", toURLs(), ClassLoader.getSystemClassLoader());
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}
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}
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/*
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* move p/Test.class out from classpath to the scratch directory
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*/
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static void setup() throws IOException {
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String dir = System.getProperty("test.classes", ".");
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Path file = Paths.get("p", "Test.class");
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Files.createDirectories(CLASSES.resolve("p"));
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Files.move(Paths.get(dir).resolve(file),
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CLASSES.resolve("p").resolve("Test.class"));
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}
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}
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