/*

 * Copyright (c) 2005, 2015, 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

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 */

/*

 * @test

 * @bug 6305746

 * @key randomness

 * @summary Test that the null values returned by the ThreadMXBean work.

 * @author Eamonn McManus

 *

 * @run clean ThreadMXBeanTest

 * @run build ThreadMXBeanTest

 * @run main ThreadMXBeanTest

 */

import java.lang.management.*;

import java.util.*;

import javax.management.*;

public class ThreadMXBeanTest {

    public static void main(String[] args) throws Exception {

        MBeanServer mbs = MBeanServerFactory.newMBeanServer();

        ThreadMXBean tmb = ManagementFactory.getThreadMXBean();

        StandardMBean smb = new StandardMBean(tmb, ThreadMXBean.class, true);

        ObjectName on = new ObjectName("a:type=ThreadMXBean");

        mbs.registerMBean(smb, on);

        ThreadMXBean proxy = JMX.newMXBeanProxy(mbs, on, ThreadMXBean.class);

        long[] ids1 = proxy.getAllThreadIds();

        // Add some random ids to the list so we'll get back null ThreadInfo

        long[] ids2 = new long[ids1.length + 10];

        System.arraycopy(ids1, 0, ids2, 0, ids1.length);

        Random r = new Random();

        for (int i = ids1.length; i < ids2.length; i++)

            ids2[i] = Math.abs(r.nextLong());

        // Following line produces an exception if null values not handled

        ThreadInfo[] info = proxy.getThreadInfo(ids2);

        boolean sawNull = false;

        for (ThreadInfo ti : info) {

            if (ti == null)

                sawNull = true;

        }

        if (!sawNull)

            throw new Exception("No null value in returned array");

        System.out.println("TEST PASSED");

    }

}