I have a program that should eventually generate OutOfMemory
.
The program code is:
public class VeryLargeObject implements Serializable {
public static final int SIZE = 1 << 12;
public String tag;
public int[][] bigOne = new int[SIZE][SIZE];
{
// Initialize bigOne
for(int i = 0; i < SIZE ; ++i) {
for(int j = 0; j < SIZE; ++j) {
bigOne[i][j] = (int) (Math.random() * 100);
}
}
}
public VeryLargeObject(String tag) {
this.tag = tag;
}
public static void main(String args[]) {
VeryLargeObject[] vla = new VeryLargeObject[1 << 12];
for(int i = 0; i < Integer.MAX_VALUE; ++i) {
vla[i] = new VeryLargeObject("aa");
}
}
}
I run the program with the following parameters:
java VeryLargeObject -Xms1024m -Xmx1024m -XX:+HeapDumpOnOutOfMemoryError -XX:HeapDumpPath="D:\workspace"
The program fails with OutOfMemory but no dump file is generated . Do you have any idea why?
Exception in thread "main" java.lang.OutOfMemoryError: Java heap space
at VeryLargeObject.<init>(VeryLargeObject.java:14)
at VeryLargeObject.main(VeryLargeObject.java:32)
The problem is that -XX:HeapDumpPath
spefies a file and not a path.
-Xms1024m -Xmx1024m -XX:+HeapDumpOnOutOfMemoryError -XX:HeapDumpPath="c:\temp\dump2.hprof"
added:
and bestsss is right too, so you need to fix both "errors":
java -Xms1024m -Xmx1024m -XX:+HeapDumpOnOutOfMemoryError -XX:HeapDumpPath="c:\temp\dump2.hprof" VeryLargeObject
For starter drop the XX options and any options BEFORE VeryLargeObject
, otherwise you pass the parameters to the java program and not the JVM
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