/* * 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 /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 { // Each ProcessBuilder should disable CDS with -Xshare:off so that no steps // that produce necessary logging are skipped. public static void main(String[] args) throws Exception { ProcessBuilder pb = ProcessTools.createJavaProcessBuilder( "-Xlog:vmoperation=debug", "-Xshare:off", "-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 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(); } } } }