1 /*

     2  * Copyright (c) 2012, 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 /*

    26  * @test

    27  * @bug 8003720

    28  * @summary Method in interpreter stack frame can be deallocated

    29  * @compile -XDignore.symbol.file Victim.java

    30  * @run main/othervm -Xverify:all -Xint Test8003720

    31  */

    32 

    33 // Attempts to make the JVM unload a class while still executing one of its methods.

    34 public class Test8003720 {

    35     final static String VICTIM_CLASS_NAME = "Victim";

    36     final static boolean QUIET = true;

    37     final static long DURATION = 30000;

    38 

    39     public interface CallMe { void callme(); }

    40 

    41     public static void main(String... av) throws Throwable {

    42         newVictimClassLoader();

    43         System.gc();

    44 

    45         newVictimClass();

    46         System.gc();

    47 

    48         newVictimInstance();

    49         System.gc();

    50 

    51         ((CallMe)newVictimInstance()).callme();

    52     }

    53 

    54     public static Object newVictimInstance() throws Throwable {

    55         return newVictimClass().newInstance();

    56     }

    57 

    58     public static Class<?> newVictimClass() throws Throwable {

    59         return Class.forName(VICTIM_CLASS_NAME, true, new VictimClassLoader());

    60     }

    61 

    62     public static ClassLoader newVictimClassLoader() throws Throwable {

    63         return new VictimClassLoader();

    64     }

    65 

    66     public static void println(String line) {

    67         if (!QUIET) {

    68             System.out.println(line);

    69         }

    70     }

    71 }