| /* |
| * Copyright (c) 2017, Oracle and/or its affiliates. All rights reserved. |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This code is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License version 2 only, as |
| * published by the Free Software Foundation. |
| * |
| * This code is distributed in the hope that it will be useful, but WITHOUT |
| * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| * version 2 for more details (a copy is included in the LICENSE file that |
| * accompanied this code). |
| * |
| * You should have received a copy of the GNU General Public License version |
| * 2 along with this work; if not, write to the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| */ |
| |
| /* |
| * @test |
| * @bug 8164512 8191360 |
| * @requires vm.compMode != "Xcomp" |
| * @summary verify if the native library is unloaded when the class loader is GC'ed |
| * @build p.Test |
| * @run main/othervm/native -Xcheck:jni NativeLibraryTest |
| */ |
| |
| import java.io.IOException; |
| import java.net.MalformedURLException; |
| import java.net.URL; |
| import java.net.URLClassLoader; |
| import java.nio.file.Files; |
| import java.nio.file.Path; |
| import java.nio.file.Paths; |
| |
| public class NativeLibraryTest { |
| static final Path CLASSES = Paths.get("classes"); |
| static int unloadedCount = 0; |
| |
| /* |
| * Called by JNI_OnUnload when the native library is unloaded |
| */ |
| static void nativeLibraryUnloaded() { |
| unloadedCount++; |
| } |
| |
| public static void main(String... args) throws Exception { |
| setup(); |
| |
| for (int count=1; count <= 5; count++) { |
| // create a class loader and load a native library |
| runTest(); |
| // unloading the class loader and native library |
| System.gc(); |
| // give Cleaner thread a chance to unload the native library |
| Thread.sleep(100); |
| |
| // unloadedCount is incremented when the native library is unloaded |
| if (count != unloadedCount) { |
| throw new RuntimeException("Expected unloaded=" + count + |
| " but got=" + unloadedCount); |
| } |
| } |
| } |
| |
| /* |
| * Loads p.Test class with a new class loader and its static initializer |
| * will load a native library. |
| * |
| * The class loader becomes unreachable when this method returns and |
| * the native library should be unloaded at some point after the class |
| * loader is garbage collected. |
| */ |
| static void runTest() throws Exception { |
| // invoke p.Test.run() that loads the native library |
| Runnable r = newTestRunnable(); |
| r.run(); |
| |
| // reload the native library by the same class loader |
| r.run(); |
| |
| // load the native library by another class loader |
| Runnable r1 = newTestRunnable(); |
| try { |
| r1.run(); |
| throw new RuntimeException("should fail to load the native library" + |
| " by another class loader"); |
| } catch (UnsatisfiedLinkError e) {} |
| } |
| |
| /* |
| * Loads p.Test class with a new class loader and returns |
| * a Runnable instance. |
| */ |
| static Runnable newTestRunnable() throws Exception { |
| TestLoader loader = new TestLoader(); |
| Class<?> c = Class.forName("p.Test", true, loader); |
| return (Runnable) c.newInstance(); |
| } |
| |
| static class TestLoader extends URLClassLoader { |
| static URL[] toURLs() { |
| try { |
| return new URL[] { CLASSES.toUri().toURL() }; |
| } catch (MalformedURLException e) { |
| throw new Error(e); |
| } |
| } |
| |
| TestLoader() { |
| super("testloader", toURLs(), ClassLoader.getSystemClassLoader()); |
| } |
| } |
| |
| /* |
| * move p/Test.class out from classpath to the scratch directory |
| */ |
| static void setup() throws IOException { |
| String dir = System.getProperty("test.classes", "."); |
| Path file = Paths.get("p", "Test.class"); |
| Files.createDirectories(CLASSES.resolve("p")); |
| Files.move(Paths.get(dir).resolve(file), |
| CLASSES.resolve("p").resolve("Test.class")); |
| } |
| } |