jdk

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/*
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 * Copyright (c) 2015, 2023, Oracle and/or its affiliates. All rights reserved.
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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 *
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 * This code is free software; you can redistribute it and/or modify it
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 * under the terms of the GNU General Public License version 2 only, as
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 * published by the Free Software Foundation.
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 *
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 * This code is distributed in the hope that it will be useful, but WITHOUT
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 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
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 * version 2 for more details (a copy is included in the LICENSE file that
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 * accompanied this code).
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 *
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 * You should have received a copy of the GNU General Public License version
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 * 2 along with this work; if not, write to the Free Software Foundation,
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 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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 *
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 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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 * or visit www.oracle.com if you need additional information or have any
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 * questions.
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 */
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/*
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 * @test
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 * @bug 8143157
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 * @summary vmoperation=debug should have logging output
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 * @requires vm.flagless
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 * @library /test/lib
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 * @modules java.base/jdk.internal.misc
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 *          java.management
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 * @run driver VMOperationTest
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 */
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import java.lang.ref.WeakReference;
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import jdk.test.lib.process.OutputAnalyzer;
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import jdk.test.lib.process.ProcessTools;
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public class VMOperationTest {
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    public static void main(String[] args) throws Exception {
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        ProcessBuilder pb = ProcessTools.createLimitedTestJavaProcessBuilder("-Xlog:vmoperation=debug",
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                                                                             "-Xmx128m",
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                                                                             "-Xms128m",
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                                                                             InternalClass.class.getName());
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        OutputAnalyzer output = new OutputAnalyzer(pb.start());
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        output.shouldContain("VM_Operation (");
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        output.shouldHaveExitValue(0);
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    }
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    public static class InternalClass {
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        public static byte[] garbage;
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        public static volatile WeakReference<Object> weakref;
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        public static void createweakref() {
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            Object o = new Object();
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            weakref = new WeakReference<>(o);
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        }
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        // Loop until a GC runs.
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        public static void main(String[] args) throws Exception {
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            createweakref();
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            while (weakref.get() != null) {
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                garbage = new byte[8192];
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                System.gc();
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            }
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        }
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    }
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}
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