41375
|
1 |
/*
|
|
2 |
* Copyright (c) 2016, 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 8151486
|
|
27 |
* @summary Call Class.forName() on the system classloader from a class loaded
|
|
28 |
* from a custom classloader.
|
|
29 |
* @library /lib/testlibrary
|
|
30 |
* @build jdk.testlibrary.Utils JarUtils
|
|
31 |
* @build ClassForName ClassForNameLeak
|
|
32 |
* @run main/othervm/policy=test.policy -Djava.security.manager ClassForNameLeak
|
|
33 |
*/
|
|
34 |
|
|
35 |
import java.lang.ref.PhantomReference;
|
|
36 |
import java.lang.ref.Reference;
|
|
37 |
import java.lang.ref.ReferenceQueue;
|
|
38 |
import java.net.URL;
|
|
39 |
import java.net.URLClassLoader;
|
|
40 |
import java.nio.file.FileSystems;
|
|
41 |
import java.nio.file.Files;
|
|
42 |
import java.nio.file.Path;
|
|
43 |
import java.nio.file.Paths;
|
|
44 |
import java.util.List;
|
|
45 |
import java.util.concurrent.Callable;
|
|
46 |
import java.util.concurrent.ExecutorService;
|
|
47 |
import java.util.concurrent.Executors;
|
|
48 |
import java.util.concurrent.Future;
|
|
49 |
import java.util.stream.Collectors;
|
|
50 |
import java.util.stream.Stream;
|
|
51 |
import jdk.testlibrary.Utils;
|
|
52 |
|
|
53 |
/*
|
|
54 |
* Create .jar, load ClassForName from .jar using a URLClassLoader
|
|
55 |
*/
|
|
56 |
public class ClassForNameLeak {
|
|
57 |
private static final long TIMEOUT = (long)(5000.0 * Utils.TIMEOUT_FACTOR);
|
|
58 |
private static final String TESTCLASSES = System.getProperty("test.classes", ".");
|
|
59 |
private static final String CLASSFILENAME = "ClassForName.class";
|
|
60 |
private static final int THREADS = 10;
|
|
61 |
private static final ReferenceQueue<ClassLoader> rq = new ReferenceQueue<>();
|
|
62 |
|
|
63 |
// Use a new classloader to load the ClassForName class, then run its
|
|
64 |
// Runnable.
|
|
65 |
public static PhantomReference<ClassLoader> loadAndRun(Path jarFilePath)
|
|
66 |
throws Exception {
|
|
67 |
ClassLoader classLoader = new URLClassLoader(
|
|
68 |
new URL[]{jarFilePath.toUri().toURL()}) {
|
|
69 |
@Override public String toString() { return "LeakedClassLoader"; }
|
|
70 |
};
|
|
71 |
|
|
72 |
Class<?> loadClass = Class.forName("ClassForName", true, classLoader);
|
|
73 |
((Runnable) loadClass.newInstance()).run();
|
|
74 |
|
|
75 |
PhantomReference<ClassLoader> ref = new PhantomReference<>(classLoader, rq);
|
|
76 |
System.out.println("returning phantom ref: " + ref + " to " + classLoader);
|
|
77 |
return ref;
|
|
78 |
}
|
|
79 |
|
|
80 |
public static void main(final String[] args) throws Exception {
|
|
81 |
// Create a temporary .jar file containing ClassForName.class
|
|
82 |
Path testClassesDir = Paths.get(TESTCLASSES);
|
|
83 |
Path jarFilePath = Files.createTempFile("cfn", ".jar");
|
|
84 |
JarUtils.createJarFile(jarFilePath, testClassesDir, CLASSFILENAME);
|
|
85 |
jarFilePath.toFile().deleteOnExit();
|
|
86 |
|
|
87 |
// Remove the ClassForName.class file that jtreg built, to make sure
|
|
88 |
// we're loading from the tmp .jar
|
|
89 |
Path classFile = FileSystems.getDefault().getPath(TESTCLASSES,
|
|
90 |
CLASSFILENAME);
|
|
91 |
Files.delete(classFile);
|
|
92 |
|
|
93 |
// Make simultaneous calls to the test method, to stress things a bit
|
|
94 |
ExecutorService es = Executors.newFixedThreadPool(THREADS);
|
|
95 |
|
|
96 |
List<Callable<PhantomReference<ClassLoader>>> callables =
|
|
97 |
Stream.generate(() -> {
|
|
98 |
Callable<PhantomReference<ClassLoader>> cprcl = () -> {
|
|
99 |
return loadAndRun(jarFilePath);
|
|
100 |
};
|
|
101 |
return cprcl;
|
|
102 |
}).limit(THREADS).collect(Collectors.toList());
|
|
103 |
|
|
104 |
List<Future<PhantomReference<ClassLoader>>> refs = es.invokeAll(callables);
|
|
105 |
|
|
106 |
// Give the GC a chance to enqueue the PhantomReferences
|
|
107 |
for (int i = 0; i < 10; i++) {
|
|
108 |
System.gc();
|
|
109 |
}
|
|
110 |
// Make sure all PhantomReferences to the leaked classloader are enqueued
|
|
111 |
for (int j = 0; j < THREADS; j++) {
|
|
112 |
Reference rmRef = rq.remove(TIMEOUT);
|
|
113 |
if (rmRef == null) {
|
|
114 |
throw new RuntimeException("ClassLoader was never enqueued!");
|
|
115 |
} else {
|
|
116 |
System.out.println("Enqueued " + rmRef);
|
|
117 |
}
|
|
118 |
}
|
|
119 |
System.out.println("All Classloaders successfully enqued");
|
|
120 |
}
|
|
121 |
}
|