1 /*
   2  * Copyright (c) 2015, 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 import jdk.test.lib.Asserts;
  25 
  26 /*
  27  * @test
  28  * @key cte_test
  29  * @bug 4784641
  30  * @summary -Xcheck:jni overly strict in JNI method IsSameObject
  31  *          Fixed in JDK1.3.1_10
  32  *          Fixed in JDK1.4.1_07
  33  * @modules java.base/jdk.internal.misc
  34  * @library /test/lib
  35  * @run main/othervm/native -Xcheck:jni SameObject
  36  */
  37 public class SameObject {
  38 
  39     public Object obj = new Object();
  40 
  41     static {
  42         System.loadLibrary("SameObject");
  43     }
  44 
  45     public native void createWeakRef(Object obj);
  46 
  47     public native int checkWeakRef();
  48 
  49     public static void main(String[] args) throws Exception {
  50         SameObject sameObject = new SameObject();
  51 
  52         int result = sameObject.test();
  53         Asserts.assertEquals(result, 0, "WeakRef still alive");
  54     }
  55 
  56     public int test() {
  57         createWeakRef(obj);
  58         obj = null;
  59         System.gc();
  60         try {
  61             Thread.sleep(2000);
  62         } catch (InterruptedException ex) {
  63             System.out.println("Interrupted");
  64         }
  65 
  66         return checkWeakRef();
  67     }
  68 }