How to make OutOfMemoryError occur on Linux JVM 64bit

Question

in my unit test I deliberately trying to raise an OutOfMemoryError exception. I use a simple statement like the following:

byte[] block = new byte[128 * 1024         


        

Answer 1

Linux doesn't always allocate you all the memory you ask for immediately, since many real applications ask for more than they need. This is called overcommit (it also means sometimes it guesses wrong, and the dreaded OOM killer strikes).

For your unittest, I would just throw OutOfMemoryError manually.