1 /*
   2  * Copyright (c) 2018 Red Hat, Inc. and/or its affiliates.
   3  *
   4  * This code is free software; you can redistribute it and/or modify it
   5  * under the terms of the GNU General Public License version 2 only, as
   6  * published by the Free Software Foundation.
   7  *
   8  * This code is distributed in the hope that it will be useful, but WITHOUT
   9  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  10  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  11  * version 2 for more details (a copy is included in the LICENSE file that
  12  * accompanied this code).
  13  *
  14  * You should have received a copy of the GNU General Public License version
  15  * 2 along with this work; if not, write to the Free Software Foundation,
  16  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  17  *
  18  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  19  * or visit www.oracle.com if you need additional information or have any
  20  * questions.
  21  *
  22  */
  23 
  24 /**
  25  * @test TestAllocSmallObj
  26  * @summary Test allocation of small object to result OOM, but not to crash JVM
  27  * @library /testlibrary
  28  * @run main TestAllocSmallObj
  29  */
  30 
  31 import com.oracle.java.testlibrary.*;
  32 
  33 public class TestAllocSmallObj {
  34 
  35     static final int COUNT = 16*1024*1024;
  36 
  37     static volatile Object sink;
  38 
  39     public static void work() throws Exception {
  40         Object[] root = new Object[COUNT];
  41         sink = root;
  42         for (int c = 0; c < COUNT; c++) {
  43             root[c] = new Object();
  44         }
  45     }
  46 
  47     public static void main(String[] args) throws Exception {
  48         if (args.length > 0) {
  49             work();
  50             return;
  51         }
  52 
  53         {
  54             ProcessBuilder pb = ProcessTools.createJavaProcessBuilder(
  55                                     "-Xmx16m",
  56                                     "-XX:+UseShenandoahGC",
  57                                     TestAllocSmallObj.class.getName(),
  58                                     "test");
  59 
  60             OutputAnalyzer analyzer = new OutputAnalyzer(pb.start());
  61             analyzer.shouldHaveExitValue(1);
  62             analyzer.shouldContain("java.lang.OutOfMemoryError: Java heap space");
  63         }
  64 
  65         {
  66             ProcessBuilder pb = ProcessTools.createJavaProcessBuilder(
  67                                     "-Xmx1g",
  68                                     "-XX:+UseShenandoahGC",
  69                                     TestAllocSmallObj.class.getName(),
  70                                     "test");
  71 
  72             OutputAnalyzer analyzer = new OutputAnalyzer(pb.start());
  73             analyzer.shouldHaveExitValue(0);
  74             analyzer.shouldNotContain("java.lang.OutOfMemoryError: Java heap space");
  75         }
  76     }
  77 }