jdk/test/java/lang/ClassLoader/forNameLeak/ClassForNameLeak.java
author bchristi
Fri, 07 Oct 2016 12:01:24 -0700
changeset 41375 45f3adbff4f7
permissions -rw-r--r--
8151486: Class.forName causes memory leak Summary: Remove ClassLoader.domains Reviewed-by: coleenp, dholmes, mchung, naoto
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
41375
45f3adbff4f7 8151486: Class.forName causes memory leak
bchristi
parents:
diff changeset
     1
/*
45f3adbff4f7 8151486: Class.forName causes memory leak
bchristi
parents:
diff changeset
     2
 * Copyright (c) 2016, Oracle and/or its affiliates. All rights reserved.
45f3adbff4f7 8151486: Class.forName causes memory leak
bchristi
parents:
diff changeset
     3
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
45f3adbff4f7 8151486: Class.forName causes memory leak
bchristi
parents:
diff changeset
     4
 *
45f3adbff4f7 8151486: Class.forName causes memory leak
bchristi
parents:
diff changeset
     5
 * This code is free software; you can redistribute it and/or modify it
45f3adbff4f7 8151486: Class.forName causes memory leak
bchristi
parents:
diff changeset
     6
 * under the terms of the GNU General Public License version 2 only, as
45f3adbff4f7 8151486: Class.forName causes memory leak
bchristi
parents:
diff changeset
     7
 * published by the Free Software Foundation.
45f3adbff4f7 8151486: Class.forName causes memory leak
bchristi
parents:
diff changeset
     8
 *
45f3adbff4f7 8151486: Class.forName causes memory leak
bchristi
parents:
diff changeset
     9
 * This code is distributed in the hope that it will be useful, but WITHOUT
45f3adbff4f7 8151486: Class.forName causes memory leak
bchristi
parents:
diff changeset
    10
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
45f3adbff4f7 8151486: Class.forName causes memory leak
bchristi
parents:
diff changeset
    11
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
45f3adbff4f7 8151486: Class.forName causes memory leak
bchristi
parents:
diff changeset
    12
 * version 2 for more details (a copy is included in the LICENSE file that
45f3adbff4f7 8151486: Class.forName causes memory leak
bchristi
parents:
diff changeset
    13
 * accompanied this code).
45f3adbff4f7 8151486: Class.forName causes memory leak
bchristi
parents:
diff changeset
    14
 *
45f3adbff4f7 8151486: Class.forName causes memory leak
bchristi
parents:
diff changeset
    15
 * You should have received a copy of the GNU General Public License version
45f3adbff4f7 8151486: Class.forName causes memory leak
bchristi
parents:
diff changeset
    16
 * 2 along with this work; if not, write to the Free Software Foundation,
45f3adbff4f7 8151486: Class.forName causes memory leak
bchristi
parents:
diff changeset
    17
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
45f3adbff4f7 8151486: Class.forName causes memory leak
bchristi
parents:
diff changeset
    18
 *
45f3adbff4f7 8151486: Class.forName causes memory leak
bchristi
parents:
diff changeset
    19
 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
45f3adbff4f7 8151486: Class.forName causes memory leak
bchristi
parents:
diff changeset
    20
 * or visit www.oracle.com if you need additional information or have any
45f3adbff4f7 8151486: Class.forName causes memory leak
bchristi
parents:
diff changeset
    21
 * questions.
45f3adbff4f7 8151486: Class.forName causes memory leak
bchristi
parents:
diff changeset
    22
 */
45f3adbff4f7 8151486: Class.forName causes memory leak
bchristi
parents:
diff changeset
    23
45f3adbff4f7 8151486: Class.forName causes memory leak
bchristi
parents:
diff changeset
    24
/*
45f3adbff4f7 8151486: Class.forName causes memory leak
bchristi
parents:
diff changeset
    25
 * @test
45f3adbff4f7 8151486: Class.forName causes memory leak
bchristi
parents:
diff changeset
    26
 * @bug 8151486
45f3adbff4f7 8151486: Class.forName causes memory leak
bchristi
parents:
diff changeset
    27
 * @summary Call Class.forName() on the system classloader from a class loaded
45f3adbff4f7 8151486: Class.forName causes memory leak
bchristi
parents:
diff changeset
    28
 *          from a custom classloader.
45f3adbff4f7 8151486: Class.forName causes memory leak
bchristi
parents:
diff changeset
    29
 * @library /lib/testlibrary
45f3adbff4f7 8151486: Class.forName causes memory leak
bchristi
parents:
diff changeset
    30
 * @build jdk.testlibrary.Utils JarUtils
45f3adbff4f7 8151486: Class.forName causes memory leak
bchristi
parents:
diff changeset
    31
 * @build ClassForName ClassForNameLeak
45f3adbff4f7 8151486: Class.forName causes memory leak
bchristi
parents:
diff changeset
    32
 * @run main/othervm/policy=test.policy -Djava.security.manager ClassForNameLeak
45f3adbff4f7 8151486: Class.forName causes memory leak
bchristi
parents:
diff changeset
    33
 */
45f3adbff4f7 8151486: Class.forName causes memory leak
bchristi
parents:
diff changeset
    34
45f3adbff4f7 8151486: Class.forName causes memory leak
bchristi
parents:
diff changeset
    35
import java.lang.ref.PhantomReference;
45f3adbff4f7 8151486: Class.forName causes memory leak
bchristi
parents:
diff changeset
    36
import java.lang.ref.Reference;
45f3adbff4f7 8151486: Class.forName causes memory leak
bchristi
parents:
diff changeset
    37
import java.lang.ref.ReferenceQueue;
45f3adbff4f7 8151486: Class.forName causes memory leak
bchristi
parents:
diff changeset
    38
import java.net.URL;
45f3adbff4f7 8151486: Class.forName causes memory leak
bchristi
parents:
diff changeset
    39
import java.net.URLClassLoader;
45f3adbff4f7 8151486: Class.forName causes memory leak
bchristi
parents:
diff changeset
    40
import java.nio.file.FileSystems;
45f3adbff4f7 8151486: Class.forName causes memory leak
bchristi
parents:
diff changeset
    41
import java.nio.file.Files;
45f3adbff4f7 8151486: Class.forName causes memory leak
bchristi
parents:
diff changeset
    42
import java.nio.file.Path;
45f3adbff4f7 8151486: Class.forName causes memory leak
bchristi
parents:
diff changeset
    43
import java.nio.file.Paths;
45f3adbff4f7 8151486: Class.forName causes memory leak
bchristi
parents:
diff changeset
    44
import java.util.List;
45f3adbff4f7 8151486: Class.forName causes memory leak
bchristi
parents:
diff changeset
    45
import java.util.concurrent.Callable;
45f3adbff4f7 8151486: Class.forName causes memory leak
bchristi
parents:
diff changeset
    46
import java.util.concurrent.ExecutorService;
45f3adbff4f7 8151486: Class.forName causes memory leak
bchristi
parents:
diff changeset
    47
import java.util.concurrent.Executors;
45f3adbff4f7 8151486: Class.forName causes memory leak
bchristi
parents:
diff changeset
    48
import java.util.concurrent.Future;
45f3adbff4f7 8151486: Class.forName causes memory leak
bchristi
parents:
diff changeset
    49
import java.util.stream.Collectors;
45f3adbff4f7 8151486: Class.forName causes memory leak
bchristi
parents:
diff changeset
    50
import java.util.stream.Stream;
45f3adbff4f7 8151486: Class.forName causes memory leak
bchristi
parents:
diff changeset
    51
import jdk.testlibrary.Utils;
45f3adbff4f7 8151486: Class.forName causes memory leak
bchristi
parents:
diff changeset
    52
45f3adbff4f7 8151486: Class.forName causes memory leak
bchristi
parents:
diff changeset
    53
/*
45f3adbff4f7 8151486: Class.forName causes memory leak
bchristi
parents:
diff changeset
    54
 * Create .jar, load ClassForName from .jar using a URLClassLoader
45f3adbff4f7 8151486: Class.forName causes memory leak
bchristi
parents:
diff changeset
    55
 */
45f3adbff4f7 8151486: Class.forName causes memory leak
bchristi
parents:
diff changeset
    56
public class ClassForNameLeak {
45f3adbff4f7 8151486: Class.forName causes memory leak
bchristi
parents:
diff changeset
    57
    private static final long TIMEOUT = (long)(5000.0 * Utils.TIMEOUT_FACTOR);
45f3adbff4f7 8151486: Class.forName causes memory leak
bchristi
parents:
diff changeset
    58
    private static final String TESTCLASSES = System.getProperty("test.classes", ".");
45f3adbff4f7 8151486: Class.forName causes memory leak
bchristi
parents:
diff changeset
    59
    private static final String CLASSFILENAME = "ClassForName.class";
45f3adbff4f7 8151486: Class.forName causes memory leak
bchristi
parents:
diff changeset
    60
    private static final int THREADS = 10;
45f3adbff4f7 8151486: Class.forName causes memory leak
bchristi
parents:
diff changeset
    61
    private static final ReferenceQueue<ClassLoader> rq = new ReferenceQueue<>();
45f3adbff4f7 8151486: Class.forName causes memory leak
bchristi
parents:
diff changeset
    62
45f3adbff4f7 8151486: Class.forName causes memory leak
bchristi
parents:
diff changeset
    63
    // Use a new classloader to load the ClassForName class, then run its
45f3adbff4f7 8151486: Class.forName causes memory leak
bchristi
parents:
diff changeset
    64
    // Runnable.
45f3adbff4f7 8151486: Class.forName causes memory leak
bchristi
parents:
diff changeset
    65
    public static PhantomReference<ClassLoader> loadAndRun(Path jarFilePath)
45f3adbff4f7 8151486: Class.forName causes memory leak
bchristi
parents:
diff changeset
    66
            throws Exception {
45f3adbff4f7 8151486: Class.forName causes memory leak
bchristi
parents:
diff changeset
    67
        ClassLoader classLoader = new URLClassLoader(
45f3adbff4f7 8151486: Class.forName causes memory leak
bchristi
parents:
diff changeset
    68
                new URL[]{jarFilePath.toUri().toURL()}) {
45f3adbff4f7 8151486: Class.forName causes memory leak
bchristi
parents:
diff changeset
    69
            @Override public String toString() { return "LeakedClassLoader"; }
45f3adbff4f7 8151486: Class.forName causes memory leak
bchristi
parents:
diff changeset
    70
        };
45f3adbff4f7 8151486: Class.forName causes memory leak
bchristi
parents:
diff changeset
    71
45f3adbff4f7 8151486: Class.forName causes memory leak
bchristi
parents:
diff changeset
    72
        Class<?> loadClass = Class.forName("ClassForName", true, classLoader);
45f3adbff4f7 8151486: Class.forName causes memory leak
bchristi
parents:
diff changeset
    73
        ((Runnable) loadClass.newInstance()).run();
45f3adbff4f7 8151486: Class.forName causes memory leak
bchristi
parents:
diff changeset
    74
45f3adbff4f7 8151486: Class.forName causes memory leak
bchristi
parents:
diff changeset
    75
        PhantomReference<ClassLoader> ref = new PhantomReference<>(classLoader, rq);
45f3adbff4f7 8151486: Class.forName causes memory leak
bchristi
parents:
diff changeset
    76
        System.out.println("returning phantom ref: " + ref + " to " + classLoader);
45f3adbff4f7 8151486: Class.forName causes memory leak
bchristi
parents:
diff changeset
    77
        return ref;
45f3adbff4f7 8151486: Class.forName causes memory leak
bchristi
parents:
diff changeset
    78
    }
45f3adbff4f7 8151486: Class.forName causes memory leak
bchristi
parents:
diff changeset
    79
45f3adbff4f7 8151486: Class.forName causes memory leak
bchristi
parents:
diff changeset
    80
    public static void main(final String[] args) throws Exception {
45f3adbff4f7 8151486: Class.forName causes memory leak
bchristi
parents:
diff changeset
    81
        // Create a temporary .jar file containing ClassForName.class
45f3adbff4f7 8151486: Class.forName causes memory leak
bchristi
parents:
diff changeset
    82
        Path testClassesDir = Paths.get(TESTCLASSES);
45f3adbff4f7 8151486: Class.forName causes memory leak
bchristi
parents:
diff changeset
    83
        Path jarFilePath = Files.createTempFile("cfn", ".jar");
45f3adbff4f7 8151486: Class.forName causes memory leak
bchristi
parents:
diff changeset
    84
        JarUtils.createJarFile(jarFilePath, testClassesDir, CLASSFILENAME);
45f3adbff4f7 8151486: Class.forName causes memory leak
bchristi
parents:
diff changeset
    85
        jarFilePath.toFile().deleteOnExit();
45f3adbff4f7 8151486: Class.forName causes memory leak
bchristi
parents:
diff changeset
    86
45f3adbff4f7 8151486: Class.forName causes memory leak
bchristi
parents:
diff changeset
    87
        // Remove the ClassForName.class file that jtreg built, to make sure
45f3adbff4f7 8151486: Class.forName causes memory leak
bchristi
parents:
diff changeset
    88
        // we're loading from the tmp .jar
45f3adbff4f7 8151486: Class.forName causes memory leak
bchristi
parents:
diff changeset
    89
        Path classFile = FileSystems.getDefault().getPath(TESTCLASSES,
45f3adbff4f7 8151486: Class.forName causes memory leak
bchristi
parents:
diff changeset
    90
                                                          CLASSFILENAME);
45f3adbff4f7 8151486: Class.forName causes memory leak
bchristi
parents:
diff changeset
    91
        Files.delete(classFile);
45f3adbff4f7 8151486: Class.forName causes memory leak
bchristi
parents:
diff changeset
    92
45f3adbff4f7 8151486: Class.forName causes memory leak
bchristi
parents:
diff changeset
    93
        // Make simultaneous calls to the test method, to stress things a bit
45f3adbff4f7 8151486: Class.forName causes memory leak
bchristi
parents:
diff changeset
    94
        ExecutorService es = Executors.newFixedThreadPool(THREADS);
45f3adbff4f7 8151486: Class.forName causes memory leak
bchristi
parents:
diff changeset
    95
45f3adbff4f7 8151486: Class.forName causes memory leak
bchristi
parents:
diff changeset
    96
        List<Callable<PhantomReference<ClassLoader>>> callables =
45f3adbff4f7 8151486: Class.forName causes memory leak
bchristi
parents:
diff changeset
    97
                Stream.generate(() -> {
45f3adbff4f7 8151486: Class.forName causes memory leak
bchristi
parents:
diff changeset
    98
                    Callable<PhantomReference<ClassLoader>> cprcl = () -> {
45f3adbff4f7 8151486: Class.forName causes memory leak
bchristi
parents:
diff changeset
    99
                        return loadAndRun(jarFilePath);
45f3adbff4f7 8151486: Class.forName causes memory leak
bchristi
parents:
diff changeset
   100
                    };
45f3adbff4f7 8151486: Class.forName causes memory leak
bchristi
parents:
diff changeset
   101
                    return cprcl;
45f3adbff4f7 8151486: Class.forName causes memory leak
bchristi
parents:
diff changeset
   102
                }).limit(THREADS).collect(Collectors.toList());
45f3adbff4f7 8151486: Class.forName causes memory leak
bchristi
parents:
diff changeset
   103
45f3adbff4f7 8151486: Class.forName causes memory leak
bchristi
parents:
diff changeset
   104
        List<Future<PhantomReference<ClassLoader>>> refs = es.invokeAll(callables);
45f3adbff4f7 8151486: Class.forName causes memory leak
bchristi
parents:
diff changeset
   105
45f3adbff4f7 8151486: Class.forName causes memory leak
bchristi
parents:
diff changeset
   106
        // Give the GC a chance to enqueue the PhantomReferences
45f3adbff4f7 8151486: Class.forName causes memory leak
bchristi
parents:
diff changeset
   107
        for (int i = 0; i < 10; i++) {
45f3adbff4f7 8151486: Class.forName causes memory leak
bchristi
parents:
diff changeset
   108
            System.gc();
45f3adbff4f7 8151486: Class.forName causes memory leak
bchristi
parents:
diff changeset
   109
        }
45f3adbff4f7 8151486: Class.forName causes memory leak
bchristi
parents:
diff changeset
   110
        // Make sure all PhantomReferences to the leaked classloader are enqueued
45f3adbff4f7 8151486: Class.forName causes memory leak
bchristi
parents:
diff changeset
   111
        for (int j = 0; j < THREADS; j++) {
45f3adbff4f7 8151486: Class.forName causes memory leak
bchristi
parents:
diff changeset
   112
            Reference rmRef = rq.remove(TIMEOUT);
45f3adbff4f7 8151486: Class.forName causes memory leak
bchristi
parents:
diff changeset
   113
            if (rmRef == null) {
45f3adbff4f7 8151486: Class.forName causes memory leak
bchristi
parents:
diff changeset
   114
                throw new RuntimeException("ClassLoader was never enqueued!");
45f3adbff4f7 8151486: Class.forName causes memory leak
bchristi
parents:
diff changeset
   115
            } else {
45f3adbff4f7 8151486: Class.forName causes memory leak
bchristi
parents:
diff changeset
   116
                System.out.println("Enqueued " + rmRef);
45f3adbff4f7 8151486: Class.forName causes memory leak
bchristi
parents:
diff changeset
   117
            }
45f3adbff4f7 8151486: Class.forName causes memory leak
bchristi
parents:
diff changeset
   118
        }
45f3adbff4f7 8151486: Class.forName causes memory leak
bchristi
parents:
diff changeset
   119
        System.out.println("All Classloaders successfully enqued");
45f3adbff4f7 8151486: Class.forName causes memory leak
bchristi
parents:
diff changeset
   120
    }
45f3adbff4f7 8151486: Class.forName causes memory leak
bchristi
parents:
diff changeset
   121
}