mybatis database paging

I started to like the interface-based approach of mybatis.
Actually there are two parts of changes (based on the modifications made in the official website demo):

• Added paging plug-in, simple and easy to use (feel good about yourself).
• Add a BaseMapper to abstract commonly used methods into this interface to avoid repeated definitions in multiple interfaces (equivalent to common dao base classes).

Based on maven and using the in-memory database hsqldb, junit tests can be run directly.

public interface BaseMapper {
 String PO_KEY = "po";

 T get(Serializable pk);

 Page getPage(@Param(PageInterceptor.PAGE_KEY) Page p, @ Param(PO_KEY) T obj);
}

@RunWith(SpringJUnit4ClassRunner.class)
@ContextConfiguration({"classpath:applicationContext.xml"})
public class ItemServiceTest {
 @Autowired
ItemService service;


 @Test
 public void testGetItem() {
 System.out.println(service.getItem(null).getProduct());
 }

 @Test
 public void testGetPage() {
 Page p = new Page();
 p.setCurrentPage (1);
 p.setSize(10);

 Item item = new Item();
 item.setProductId("FI-SW-01");

 service.getPage(p, item);

 System .out.println(p.getTotal() + " " + p.getResult().size());

 for(Item i : p.getResult()) {
 System.out.println(i.getItemId( ));
 }
 }

}