--- /dev/null 2018-11-26 11:49:18.255023023 +0100 +++ new/test/hotspot/jtreg/gc/shenandoah/TestHeapAlloc.java 2018-11-26 21:30:31.687855997 +0100 @@ -0,0 +1,81 @@ +/* + * Copyright (c) 2017, 2018, Red Hat, Inc. All rights reserved. + * + * 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 TestHeapAlloc + * @key gc + * @summary Fail to expand Java heap should not result fatal errors + * @requires (vm.debug == true) + * @library /test/lib + * @modules java.base/jdk.internal.misc + * java.management + * @ignore // heap is not resized in a conventional manner, ignore for now + */ + +import jdk.test.lib.process.ProcessTools; +import jdk.test.lib.process.OutputAnalyzer; +import jdk.test.lib.Platform; + +import java.util.*; +import java.util.concurrent.*; + +public class TestHeapAlloc { + + public static void main(String[] args) throws Exception { + if (!Platform.isDebugBuild()) { + System.out.println("Test requires debug build. Please silently for release build"); + return; + } + + ProcessBuilder pb = ProcessTools.createJavaProcessBuilder( + true, + "-Xmx1G", + "-Xms256M", + "-XX:+UnlockExperimentalVMOptions", + "-XX:+UseShenandoahGC", + "-XX:ShenandoahFailHeapExpansionAfter=50", + "-Xlog:gc+region=debug", + AllocALotObjects.class.getName()); + OutputAnalyzer output = new OutputAnalyzer(pb.start()); + output.shouldContain("Artificially fails heap expansion"); + output.shouldHaveExitValue(0); + } + + public static class AllocALotObjects { + public static void main(String[] args) { + try { + ArrayList list = new ArrayList<>(); + long count = 500 * 1024 * 1024 / 16; // 500MB allocation + for (long index = 0; index < count; index ++) { + String sink = "string " + index; + list.add(sink); + } + + int index = ThreadLocalRandom.current().nextInt(0, (int)count); + System.out.print(list.get(index)); + } catch (OutOfMemoryError e) { + } + } + } + +}