PostRegisterDeadlockTest2.java

/*
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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
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 * 2 along with this work; if not, write to the Free Software Foundation,
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/*
 * @test
 * @bug 6417044
 * @summary Test that a failing MBean registration does not lead to a deadlock
 * @author Eamonn McManus
 *
 * @run main PostRegisterDeadlockTest2
 */

import javax.management.*;

public class PostRegisterDeadlockTest2 {
    private static String failed;

    public static interface EmptyMBean {}

    public static class Empty implements EmptyMBean, MBeanRegistration {
        public ObjectName preRegister(MBeanServer mbs, ObjectName on) {
            this.mbs = mbs;
            this.on = on;
            return on;
        }
        public void postRegister(Boolean done) {
            Thread t = new Thread() {
                public void run() {
                    if (!mbs.isRegistered(on))
                        failed = "Not registered!";
                }
            };
            t.start();
            try {
                t.join(5000L);
            } catch (InterruptedException e) {
                failed = "Interrupted: " + e;
            }
            if (t.isAlive())
                failed = "Deadlock detected";
        }
        public void preDeregister() {}
        public void postDeregister() {}

        private MBeanServer mbs;
        private ObjectName on;
    }

    public static void main(String[] args) throws Exception {
        MBeanServer mbs = MBeanServerFactory.newMBeanServer();
        ObjectName on = new ObjectName("a:b=c");
        mbs.registerMBean(new Empty(), on);
        try {
            mbs.registerMBean(new Empty(), on);
            throw new Exception("FAILED: did not get expected exception");
        } catch (InstanceAlreadyExistsException e) {
            System.out.println("OK: got expected exception");
        }
        if (failed != null)
            throw new Exception("FAILED: " + failed);
        System.out.println("TEST PASSED");
    }
}