java - @NotNull 在类里面被忽略

Question

我有一个实体:

@Entity
public class MyEntity {

  @Id
  private String Id;

  @NotNull
  @Column(nullable = false)
  private Integer size;

  public void setSize(Integer size) { this.size = size; }
  public Integer getSize() { return this.size; }

  public void setId(String id) { this.id = id; }
  public String getId() { return this.id; }
}

存储库:

@Repository
public class MyEntityDAO {

  @PersistenceContext
  private EntityManager em;

  public void create(MyEntity myEntity) {
    em.persist(myEntity);
  }
}

应该抛出异常的测试:

@RunWith(SpringRunner.class)
@Transactional
@SpringBootTest
public class MyEntityDAOTest {

  @Inject 
  private MyEntityDAO myEntityDAO;

  @Test(expected = ConstraintViolationException.class)
  public void nullSizeNotAllowedTest() {
    MyEntity myEntity = new MyEntity();
    myEntity.setSize(null);
    myEntity.setId("entity_id");
    myEntityDAO.create(myEntity);
  }
}

但是测试失败了。实体不会抛出所需的异常。注释适用于字符串，但不适用于整数。

为 MyEntity 自动生成的表:

FIELD   TYPE            NULL    KEY     DEFAULT  
ID      VARCHAR(255)    NO      PRI     NULL
SIZE    INTEGER(10)     NO              NULL

更新

当我将 @GeneratedValue(strategy = ...) 指定到 Id 字段时，一切正常。但是，我希望能够将自己的值分配给主键字段。

更新 2

更新实体(更新存储库以反射(reflect)更改):

@Entity
public class MyEntity {

  @Id
  private Long Id;

  @NaturalId
  private String oldId;

  @NotNull
  @Column(nullable = false)
  private Integer size;

  /* getters and setters */
}

为 MyEntity 自动生成的表:

FIELD   TYPE            NULL    KEY     DEFAULT  
ID      BIGINT(19)      NO      PRI     NULL
OLD_ID  VARCHAR(255)    YES     UNI     NULL
SIZE    INTEGER(10)     NO              NULL

Answer 1

您必须在调用 entityManager.save() 之后调用 entityManager.flush()。

否则，将不会抛出异常，也不会在您的测试中提取异常。

这是一个完整的工作示例:

我的实体:

@Entity
public class MyEntity {

    @Id
    private String id;

    @Column(nullable = false)
    @NotNull
    private Integer size;

    public MyEntity(){}

    public String getId() {
        return id;
    }

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

    public Integer getSize() {
        return size;
    }

    public void setSize(Integer size) {
         this.size = size;
    }
}

MyEntityDAO:

@Repository
public class MyEntityDAO {

     @PersistenceContext
     private EntityManager entityManager;

     public void save(MyEntity myEntity){
          entityManager.persist(myEntity);
          entityManager.flush();
     }
}

MyEntityDAOTest:

@RunWith(SpringRunner.class)
@Transactional
@SpringBootTest
public class MyEntityDAOTest {

    @Autowired
    private MyEntityDAO myEntityDAO;

    @Test(expected = ConstraintViolationException.class)
    public void nullSizeNotAllowedTest() throws Exception {
        MyEntity myEntity = new MyEntity();
        myEntity.setId("testId");
        myEntity.setSize(null);
        myEntityDAO.save(myEntity);
    }
}