1 /*

     2  * Copyright 2003 Sun Microsystems, Inc.  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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,

    20  * CA 95054 USA or visit www.sun.com if you need additional information or

    21  * have any questions.

    22  */

    23 

    24 /*

    25  * @test

    26  * @bug 4892841

    27  * @summary     Subject.getPrincipals(Class) not thread-safe against changes to

    28  *              principals

    29  */

    30 

    31 import java.util.Set;

    32 import javax.security.auth.Subject;

    33 import javax.security.auth.x500.X500Principal;

    34 

    35 public class Synch3 {

    36     public static void main(String[] args) {

    37         Subject subject = new Subject();

    38         final Set principals = subject.getPrincipals();

    39         principals.add(new X500Principal("CN=Alice"));

    40         new Thread() {

    41             {

    42                 setDaemon(true);

    43                 start();

    44             }

    45             public void run() {

    46                 X500Principal p = new X500Principal("CN=Bob");

    47                 while (true) {

    48                     principals.add(p);

    49                     principals.remove(p);

    50                 }

    51             }

    52         };

    53         for (int i = 0; i < 1000; i++) {

    54             subject.getPrincipals(X500Principal.class);

    55         }

    56     }

    57 }