@Test
public void testSortSimpleName() throws Exception {

    List<String> list = new ArrayList<String>();
    list.add("aaa.z");
    list.add("b");
    list.add(null);
    list.add("zzz.a");
    list.add("c");
    list.add(null);
    List<String> sorted = CollectionUtils.sortSimpleName(list);
    assertNull(sorted.get(0));
    assertNull(sorted.get(1));
}