属性 jpa 引用异常

Question

我是 spring 数据 jpa 的新手并尝试使用它，但遇到 org.springframework.data.mapping.PropertyReferenceException 的问题：未找到类型用户的属性名称！有人可以建议我可以做什么吗？我正在苦苦挣扎，但找不到解决方案

**Service**
public interface UserService {
        Page<User> findAllUsers(); 
    }

**Service Impl** where I am trying to implement the service methods            
@Service("userService")
@Transactional
public class UserServiceImpl implements UserService{
    /*@Autowired*/
    @Qualifier("userDao")
    private  final UserDao dao;

        @Autowired
        public UserServiceImpl(UserDao dao) {
            this.dao = dao;
        }
        private static final AtomicLong counter = new AtomicLong();

        private static List<User> users;
                public Page<User> findAllUsers() {
                        return dao.findAll(pageRequest);
                }

**DAO**
public interface UserDao extends JpaRepository<User, Long>  {
}

**User**    

      @Entity
            @Table(name="USERAG")
            public class User implements Serializable {
                @Id
                @GeneratedValue(strategy = GenerationType.SEQUENCE, generator = "users_seq")
                        private long id;

                @Column(name = "NAME", nullable = true)
                private String username;

                @Column(name = "ADDRESS", nullable = true)
                private String address;

                @Column(name = "EMAIL", nullable = true)
                private String email;

Answer 1

我认为您删除了 DAO 方法。我好像记得你在 "name" 有过订单。您的实体没有 "name"，而是 "username"。简而言之，它在您的实体（您没有）上寻找 "name"

属性 jpa 引用异常

Property reference exception with jpa

spring

spring-data-jpa

spring-restcontroller