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Revision 1.2 - (download) (annotate)
Tue Jan 31 01:44:39 2017 UTC (21 months, 2 weeks ago) by jsr166
Branch: MAIN
Changes since 1.1: +12 -1 lines
JDK-8172726: ForkJoin common pool retains a reference to the thread context class loader
/*
 * Written by Doug Lea and Martin Buchholz with assistance from
 * members of JCP JSR-166 Expert Group and released to the public
 * domain, as explained at
 * http://creativecommons.org/publicdomain/zero/1.0/
 */

import java.lang.invoke.MethodHandles;
import java.lang.invoke.VarHandle;
import java.util.concurrent.CompletableFuture;

import junit.framework.Test;
import junit.framework.TestSuite;

public class ForkJoinPool9Test extends JSR166TestCase {
    public static void main(String[] args) {
        main(suite(), args);
    }

    public static Test suite() {
        return new TestSuite(ForkJoinPool9Test.class);
    }

    /**
     * Check handling of common pool thread context class loader
     */
    public void testCommonPoolThreadContextClassLoader() throws Throwable {
        if (!testImplementationDetails) return;
        VarHandle CCL =
            MethodHandles.privateLookupIn(Thread.class, MethodHandles.lookup())
            .findVarHandle(Thread.class, "contextClassLoader", ClassLoader.class);
        ClassLoader systemClassLoader = ClassLoader.getSystemClassLoader();
        boolean haveSecurityManager = (System.getSecurityManager() != null);
        CompletableFuture.runAsync(
            () -> {
                assertSame(systemClassLoader,
                           Thread.currentThread().getContextClassLoader());
                assertSame(systemClassLoader,
                           CCL.get(Thread.currentThread()));
                if (haveSecurityManager)
                    assertThrows(
                        SecurityException.class,
                        () -> System.getProperty("foo"),
                        () -> Thread.currentThread().setContextClassLoader(null));

                // TODO ?
//                 if (haveSecurityManager
//                     && Thread.currentThread().getClass().getSimpleName()
//                     .equals("InnocuousForkJoinWorkerThread"))
//                     assertThrows(SecurityException.class, /* ?? */);
            }).join();
    }

}

Doug Lea
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