gistfile1.txt

class Test {
	static enum E {
		E1, E2, E3, E4, E5;
	}

	public static void main(String []args) {
		Thread threads[] = new Thread[30];

		for (int i = 0; i < threads.length; i++) {
			threads[i] = new Thread() {
					public void run() {
						for (int i = 0; i < 10000; i++);
						E e = E.E1;
						if (e == null)
							throw new AssertionError();
					}
				};
		}

		for (int i = 0; i < threads.length; i++)
			threads[i].start();
	}
}

------------------------------------------

while true; do ./jato Test; done

Exception in thread "Thread-17" java.lang.AssertionError
   at Test$1.run(Test.java:15)
   at java.lang.VMThread.run(VMThread.java:120)
Exception in thread "Thread-16" java.lang.AssertionError
   at Test$1.run(Test.java:15)
   at java.lang.VMThread.run(VMThread.java:120)
Exception in thread "Thread-16" java.lang.AssertionError
   at Test$1.run(Test.java:15)
   at java.lang.VMThread.run(VMThread.java:120)