public static boolean empty(String s) {
        return (s == null || s.equals(""));
    }
@Test
    public void testEmpty() {
        assertTrue(LogUtils.empty(null));
        assertTrue(LogUtils.empty(""));
        assertFalse(LogUtils.empty("f"));
        assertFalse(LogUtils.empty("fo"));
        assertFalse(LogUtils.empty("foo"));
    }