@Test
 public void testGetType() {
   System.out.println("testGetType");
   assertEquals(Long.class, container.getType("id"));
   assertEquals(Long.class, container.getType("version"));
   assertEquals(String.class, container.getType("name"));
   assertEquals(String.class, container.getType("description"));
   assertEquals(Category.class, container.getType("parent"));
 }
 @Test
 public void testGetType_Nonexistent() {
   System.out.println("testGetType_Nonexistent");
   assertNull(container.getType("nonexistent"));
 }