一、問題描述：

springboot 整合 mybatis 過程：

就是簡單的在MySql中建了個users表，很簡單，包含id,name,age，寫了個實體類 USer 。

public class User {

    private Long id;
    private String name;
    private Integer age;

    public Long getId() {
        return id;
    }

    public void setId(Long id) {
        this.id = id;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public Integer getAge() {
        return age;
    }

    public void setAge(Integer age) {
        this.age = age;
    }

    public User() {
    }

    public User(Long id, String name, Integer age) {
        this.id = id;
        this.name = name;
        this.age = age;
    }
}
 

單元測試程式碼：

@RunWith(SpringJUnit4ClassRunner.class)
@SpringApplicationConfiguration(classes = Application.class)
@Transactional
public class ApplicationTests {

	@Autowired
	private UserMapper userMapper;

	@Test
	@Rollback
	public void findByName() throws Exception {
		userMapper.insert("AAA", 20);
		User u = userMapper.findByName("AAA");
		Assert.assertEquals(20, u.getAge().intValue());
	}

}
 

org.mybatis.spring.MyBatisSystemException: nested exception is org.apache.ibatis.executor.ExecutorException: No constructor found in com.didispace.domain.User matching [java.lang.Long, java.lang.Integer, java.lang.String]

	at org.mybatis.spring.MyBatisExceptionTranslator.translateExceptionIfPossible(MyBatisExceptionTranslator.java:79)
	at org.mybatis.spring.SqlSessionTemplate$SqlSessionInterceptor.invoke(SqlSessionTemplate.java:447)
	at com.sun.proxy.$Proxy41.selectOne(Unknown Source)
	at org.mybatis.spring.SqlSessionTemplate.selectOne(SqlSessionTemplate.java:167)
 

 呵呵。在User中增加了一個預設的建構函式，通過。。。done。