TestNPE (with devirtualization)

TestSt.java

public class TestSt{
	public static String prevMessage;

	public static void main(String[] args) throws Exception {
		while (true){
			testNpe();
		}
	}

	public static void testNpe() throws Exception{
		try{
			((String)null).length();
		}catch (NullPointerException e){
			if (e.getMessage()==null || e.getMessage().length()==0 || !e.getMessage().equals(prevMessage)){
				if (e.getMessage()!=null){
					prevMessage = e.getMessage();
				}
				e.printStackTrace();
				Thread.sleep(500);
			}
		}
	}
}