Java – deliberately cause OutOfMemoryException

Tuesday, August 4th, 2015

package test;

import java.util.ArrayList;
import java.util.List;

public class OutOfMemory {
    public static void main(String[] args) {
    	final List<String>list = new ArrayList<String>();
    	int i = 1;
    	while(true) {
			list.add(new String(System.nanoTime()+""));
			list.addAll(list);
			System.out.println(i+ " " + Runtime.getRuntime().freeMemory());
			i++;
		}
    	
    }
}

After a few seconds should output something like:


Exception in thread "main" java.lang.OutOfMemoryError: Java heap space
at java.util.Arrays.copyOf(Arrays.java:2245)
at java.util.Arrays.copyOf(Arrays.java:2219)
at java.util.ArrayList.grow(ArrayList.java:213)
at java.util.ArrayList.ensureCapacityInternal(ArrayList.java:187)
at java.util.ArrayList.addAll(ArrayList.java:532)
at test.OutOfMemory.main(OutOfMemory.java:12)


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Tags: java
Posted in: Interview Questions