jdk8-mips64-public/hotspot: test/runtime/ClassUnload/UnloadTest.java@fb9d124d9192

     1 /*

     2  * Copyright (c) 2013, 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  */

    24 /*

    25  * @test UnloadTest

    26  * @library /runtime/testlibrary /testlibrary /testlibrary/whitebox

    27  * @library classes

    28  * @build ClassUnloadCommon test.Empty

    29  * @build UnloadTest

    30  * @run main ClassFileInstaller sun.hotspot.WhiteBox

    31  * @run main/othervm -Xbootclasspath/a:. -Xmn8m -XX:+UnlockDiagnosticVMOptions -XX:+WhiteBoxAPI UnloadTest

    32  */

    33 import sun.hotspot.WhiteBox;

    35 /**

    36  * Test that verifies that classes are unloaded when they are no longer reachable.

    37  *

    38  * The test creates a class loader, uses the loader to load a class and creates an instance

    39  * of that class. The it nulls out all the references to the instance, class and class loader

    40  * and tries to trigger class unloading. Then it verifies that the class is no longer

    41  * loaded by the VM.

    42  */

    43 public class UnloadTest {

    44     private static String className = "test.Empty";

    46     public static void main(String... args) throws Exception {

    47        run();

    48     }

    50     private static void run() throws Exception {

    51         final WhiteBox wb = WhiteBox.getWhiteBox();

    53         ClassUnloadCommon.failIf(wb.isClassAlive(className), "is not expected to be alive yet");

    55         ClassLoader cl = ClassUnloadCommon.newClassLoader();

    56         Class<?> c = cl.loadClass(className);

    57         Object o = c.newInstance();

    59         ClassUnloadCommon.failIf(!wb.isClassAlive(className), "should be live here");

    61         cl = null; c = null; o = null;

    62         ClassUnloadCommon.triggerUnloading();

    63         ClassUnloadCommon.failIf(wb.isClassAlive(className), "should have been unloaded");

    64     }

    65 }

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