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/*
* 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"));
}
}
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