/*

 * Copyright (c) 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.

 *

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 */

/*

 * @test

 * @bug 8143157

 * @summary vmoperation=debug should have logging output

 * @library /testlibrary

 * @modules java.base/sun.misc

 *          java.management

 * @build jdk.test.lib.OutputAnalyzer jdk.test.lib.ProcessTools

 * @run driver VMOperationTest

 */

import java.lang.ref.WeakReference;

import jdk.test.lib.OutputAnalyzer;

import jdk.test.lib.ProcessTools;

public class VMOperationTest {

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

        ProcessBuilder pb = ProcessTools.createJavaProcessBuilder(

            "-Xlog:vmoperation=debug", "-Xmx64m", "-Xms64m",

            InternalClass.class.getName());

        OutputAnalyzer output = new OutputAnalyzer(pb.start());

        output.shouldContain("VM_Operation (");

        output.shouldHaveExitValue(0);

    }

    public static class InternalClass {

        public static byte[] garbage;

        public static volatile WeakReference<Object> weakref;

        public static void createweakref() {

            Object o = new Object();

            weakref = new WeakReference<>(o);

        }

        // Loop until a GC runs.

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

            createweakref();

            while (weakref.get() != null) {

                garbage = new byte[8192];

                System.gc();

            }

        }

    }

}