| /* |
| * Copyright (c) 2015, 2016, 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 8143157 |
| * @summary vmoperation=debug should have logging output |
| * @library /test/lib |
| * @modules java.base/jdk.internal.misc |
| * java.management |
| * @run driver VMOperationTest |
| */ |
| |
| import java.lang.ref.WeakReference; |
| import jdk.test.lib.process.OutputAnalyzer; |
| import jdk.test.lib.process.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(); |
| } |
| } |
| } |
| } |
| |