test/javax/security/auth/Subject/Synch3.java

/*
 * Copyright (c) 2003, Oracle and/or its affiliates. All rights reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.
 *
 * This code is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
 * or visit www.oracle.com if you need additional information or have any
 * questions.
 */

/*
 * @test
 * @bug 4892841
 * @summary     Subject.getPrincipals(Class) not thread-safe against changes to
 *              principals
 */

import java.util.Set;
import javax.security.auth.Subject;
import javax.security.auth.x500.X500Principal;

public class Synch3 {
    public static void main(String[] args) {
        Subject subject = new Subject();
        final Set principals = subject.getPrincipals();
        principals.add(new X500Principal("CN=Alice"));
        new Thread() {
            {
                setDaemon(true);
                start();
            }
            public void run() {
                X500Principal p = new X500Principal("CN=Bob");
                while (true) {
                    principals.add(p);
                    principals.remove(p);
                }
            }
        };
        for (int i = 0; i < 1000; i++) {
            subject.getPrincipals(X500Principal.class);
        }
    }
}