*/
public class Main {
+ static char [][] holder;
+
static class ArrayMemEater {
static boolean sawOome;
static void blowup(char[][] holder) {
try {
for (int i = 0; i < holder.length; ++i) {
- holder[i] = new char[1024 * 1024];
+ holder[i] = new char[1022 * 1024];
}
} catch (OutOfMemoryError oome) {
ArrayMemEater.sawOome = true;
}
}
- static boolean triggerArrayOOM() {
- ArrayMemEater.blowup(new char[128 * 1024][]);
+ static class InstanceFinalizerMemEater {
+ static boolean sawOome;
+ static InstanceFinalizerMemEater hook;
+
+ InstanceFinalizerMemEater next;
+
+ static InstanceFinalizerMemEater allocate() {
+ try {
+ return new InstanceFinalizerMemEater();
+ } catch (OutOfMemoryError e) {
+ InstanceFinalizerMemEater.sawOome = true;
+ return null;
+ }
+ }
+
+ static void confuseCompilerOptimization(InstanceFinalizerMemEater instance) {
+ hook = instance;
+ }
+
+ protected void finalize() {}
+ }
+
+ static boolean triggerArrayOOM(char[][] holder) {
+ ArrayMemEater.blowup(holder);
return ArrayMemEater.sawOome;
}
return InstanceMemEater.sawOome;
}
+ static boolean triggerInstanceFinalizerOOM() {
+ InstanceFinalizerMemEater memEater = InstanceFinalizerMemEater.allocate();
+ InstanceFinalizerMemEater lastMemEater = memEater;
+ do {
+ lastMemEater.next = InstanceFinalizerMemEater.allocate();
+ lastMemEater = lastMemEater.next;
+ } while (lastMemEater != null);
+ memEater.confuseCompilerOptimization(memEater);
+ InstanceFinalizerMemEater.hook = null;
+ return InstanceFinalizerMemEater.sawOome;
+ }
+
public static void main(String[] args) {
- if (triggerArrayOOM()) {
+ // Keep holder alive to make instance OOM happen faster
+ holder = new char[128 * 1024][];
+ if (triggerArrayOOM(holder)) {
System.out.println("NEW_ARRAY correctly threw OOME");
}
+ if (!triggerInstanceFinalizerOOM()) {
+ System.out.println("NEW_INSTANCE (finalize) did not threw OOME");
+ }
+
if (triggerInstanceOOM()) {
System.out.println("NEW_INSTANCE correctly threw OOME");
}