1 /* 2 * Copyright (c) 2017, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 */ 23 24 /* 25 * @test 26 * @bug 8164512 8191360 27 * @requires vm.compMode != "Xcomp" 28 * @summary verify if the native library is unloaded when the class loader is GC'ed 29 * @build p.Test 30 * @run main/othervm/native -Xcheck:jni NativeLibraryTest 31 */ 32 33 import java.io.IOException; 34 import java.net.MalformedURLException; 35 import java.net.URL; 36 import java.net.URLClassLoader; 37 import java.nio.file.Files; 38 import java.nio.file.Path; 39 import java.nio.file.Paths; 40 41 public class NativeLibraryTest { 42 static final Path CLASSES = Paths.get("classes"); 43 static int unloadedCount = 0; 44 45 /* 46 * Called by JNI_OnUnload when the native library is unloaded 47 */ 48 static void nativeLibraryUnloaded() { 49 unloadedCount++; 50 } 51 52 public static void main(String... args) throws Exception { 53 setup(); 54 55 for (int count=1; count <= 5; count++) { 56 // create a class loader and load a native library 57 runTest(); 58 // unloading the class loader and native library 59 System.gc(); 60 // give Cleaner thread a chance to unload the native library 61 Thread.sleep(100); 62 63 // unloadedCount is incremented when the native library is unloaded 64 if (count != unloadedCount) { 65 throw new RuntimeException("Expected unloaded=" + count + 66 " but got=" + unloadedCount); 67 } 68 } 69 } 70 71 /* 72 * Loads p.Test class with a new class loader and its static initializer 73 * will load a native library. 74 * 75 * The class loader becomes unreachable when this method returns and 76 * the native library should be unloaded at some point after the class 77 * loader is garbage collected. 78 */ 79 static void runTest() throws Exception { 80 // invoke p.Test.run() that loads the native library 81 Runnable r = newTestRunnable(); 82 r.run(); 83 84 // reload the native library by the same class loader 85 r.run(); 86 87 // load the native library by another class loader 88 Runnable r1 = newTestRunnable(); 89 try { 90 r1.run(); 91 throw new RuntimeException("should fail to load the native library" + 92 " by another class loader"); 93 } catch (UnsatisfiedLinkError e) {} 94 } 95 96 /* 97 * Loads p.Test class with a new class loader and returns 98 * a Runnable instance. 99 */ 100 static Runnable newTestRunnable() throws Exception { 101 TestLoader loader = new TestLoader(); 102 Class<?> c = Class.forName("p.Test", true, loader); 103 return (Runnable) c.newInstance(); 104 } 105 106 static class TestLoader extends URLClassLoader { 107 static URL[] toURLs() { 108 try { 109 return new URL[] { CLASSES.toUri().toURL() }; 110 } catch (MalformedURLException e) { 111 throw new Error(e); 112 } 113 } 114 115 TestLoader() { 116 super("testloader", toURLs(), ClassLoader.getSystemClassLoader()); 117 } 118 } 119 120 /* 121 * move p/Test.class out from classpath to the scratch directory 122 */ 123 static void setup() throws IOException { 124 String dir = System.getProperty("test.classes", "."); 125 Path file = Paths.get("p", "Test.class"); 126 Files.createDirectories(CLASSES.resolve("p")); 127 Files.move(Paths.get(dir).resolve(file), 128 CLASSES.resolve("p").resolve("Test.class")); 129 } 130 }