1 /*
2  * Copyright (C) 2014 The Android Open Source Project
3  *
4  * Licensed under the Apache License, Version 2.0 (the "License");
5  * you may not use this file except in compliance with the License.
6  * You may obtain a copy of the License at
7  *
8  *      http://www.apache.org/licenses/LICENSE-2.0
9  *
10  * Unless required by applicable law or agreed to in writing, software
11  * distributed under the License is distributed on an "AS IS" BASIS,
12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13  * See the License for the specific language governing permissions and
14  * limitations under the License.
15  */
16 
17 import java.util.Vector;
18 
19 public class Main {
20     static char [][] holder;
21 
22     static class ArrayMemEater {
23         static boolean sawOome;
24 
blowup(char[][] holder)25         static void blowup(char[][] holder) {
26             try {
27                 for (int i = 0; i < holder.length; ++i) {
28                     holder[i] = new char[1024 * 1024];
29                 }
30             } catch (OutOfMemoryError oome) {
31                 ArrayMemEater.sawOome = true;
32             }
33         }
34     }
35 
36     static class InstanceFinalizerMemEater {
finalize()37         public void finalize() {}
38     }
39 
triggerArrayOOM(char[][] holder)40     static boolean triggerArrayOOM(char[][] holder) {
41         ArrayMemEater.blowup(holder);
42         return ArrayMemEater.sawOome;
43     }
44 
triggerInstanceFinalizerOOM()45     static boolean triggerInstanceFinalizerOOM() {
46         boolean sawOome = false;
47         try {
48             Vector v = new Vector();
49             while (true) {
50                 v.add(new InstanceFinalizerMemEater());
51             }
52         } catch (OutOfMemoryError e) {
53             sawOome = true;
54         }
55         return sawOome;
56     }
57 
main(String[] args)58     public static void main(String[] args) {
59         // Keep holder alive to make instance OOM happen faster.
60         holder = new char[128 * 1024][];
61         if (!triggerArrayOOM(holder)) {
62             // The test failed here. To avoid potential OOME during println,
63             // make holder unreachable.
64             holder = null;
65             System.out.println("NEW_ARRAY did not throw OOME");
66         }
67 
68         if (!triggerInstanceFinalizerOOM()) {
69             // The test failed here. To avoid potential OOME during println,
70             // make holder unreachable.
71             holder = null;
72             System.out.println("NEW_INSTANCE (finalize) did not throw OOME");
73         }
74 
75         // Make holder unreachable here so that the Sentinel
76         // allocation in runFinalization() won't fail.
77         holder = null;
78         System.runFinalization();
79     }
80 }
81