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Java OutOfMemory Example

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This java code, when executed, throws OOM error.

Java Console:
...
Exception in thread "main" java.lang.OutOfMemoryError
...

Heapdump Data:
...
1STHEAPFREE Bytes of Heap Space Free: 0
1STHEAPALLOC Bytes of Heap Space Allocated: 66666600
...

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  1. import java.util.ArrayList;
  2. import java.util.List;
  3.  
  4. public class JavaOOM {
  5.  
  6. 	public static void main(String[] args) {
  7. 		System.out.println("Initial freeMemory: "+Runtime.getRuntime().freeMemory()/(1024*1024));
  8. 		oom1();
  9.  
  10. 	}
  11.  
  12. 	private static void oom1() {
  13. 		List<String> myList = new ArrayList<String>();
  14. 		for (long i=0; ; i++) {
  15. 			myList.add(new String(i+" - "+System.currentTimeMillis()));
  16. 			if (i%100000==0) {
  17. 				System.gc();
  18. 				System.out.println("i: "+i+", freeMemory: "+Runtime.getRuntime().freeMemory()/(1024*1024));
  19. 			}
  20. 		}
  21. 	}
  22.  
  23. }

URL: http://www.javacodegeeks.com/2013/08/understanding-the-outofmemoryerror.html

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