[英]Spring boot CrudRepository mysql
嗨,我正在尝试使用crudRepository,但出现错误java.lang.nullPointer异常
我有User类:
@Entity
@Table(name="Utilisateur")
public class User {
@Id
private long id;
@Column(name="nom")
private String nom;
@Column(name="prenom")
private String prenom;
@Column(name="admin")
private boolean admin;
@Column(name="actif")
private boolean actif;
@Column(name="logins")
private String logins;
@Column(name="email")
private String email;
@Column(name="naissance")
private String naissance;
@Column(name="pwd")
private String pwd;
@Column(name="compte")
private String compte;
public User(){
}
public User(String nom, String prenom, boolean admin, boolean actif, String logins, String email, String naissance, String pwd, String compte) {
this.nom = nom;
this.prenom = prenom;
this.admin = admin;
this.actif = actif;
this.logins = logins;
this.email = email;
this.naissance = naissance;
this.pwd = pwd;
this.compte = compte;
}
我有了界面后,她扩展了界面CrudRepository
@Repository public interface UserDao extends CrudRepository<User,Long>{
public User findByEmail(String email);
}
在我有我的班级用户控制器后:
@RestController
public class UserController {
private UserDao userDao ;
@RequestMapping(
value="/api/greetings/post",
method = RequestMethod.POST,
consumes = MediaType.APPLICATION_JSON_VALUE,
produces=MediaType.APPLICATION_JSON_VALUE
)
public ResponseEntity<User> getByEmail(@RequestBody User user){
String userId;
String login;
User user1=null;
try{
user1 = userDao.findByEmail(user.getEmail());
if(user1==null){
return new ResponseEntity<User>(HttpStatus.INTERNAL_SERVER_ERROR);
}
userId = String.valueOf(user1.getId());
login=user1.getLogins();
}catch(Exception ex){
return new ResponseEntity<User>(HttpStatus.INTERNAL_SERVER_ERROR);
}
return new ResponseEntity<User>(user1, HttpStatus.OK);
}
}
为了测试,我使用邮递员进行职位查询,在功能上我得到了对象,这不是一个休息的问题。
谢谢
您需要自动连接userDao属性。
@Autowire私人UserDao userDao;
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