在simple spring boot crud api上创建用户的问题

首次启动api后,前3个用户创建Post请求失败(Post底部的屏幕截图),出现以下错误(唯一约束位置)。

随后的请求可以工作,第一个创建的用户的id是4,然后是5,以此类推。。。

如何使用户创建在第一(3)次尝试中工作?

INSERT INTO user VALUES (1, 'user1', 'pass1', 'ADMIN'); INSERT INTO user VALUES (2, 'user2', 'pass2', 'USER'); INSERT INTO user VALUES (3, 'user3', 'pass3', 'ADMIN')

无法执行语句;SQL[不适用];上的约束[\”主键 PUBLIC.USER(ID)\“;SQL语句:\n插入用户(名称、密码、, 角色,id)值(?,?,?)[23505-196]];嵌套异常为 执行语句“,

@RestController
public class UserResource {

    @Autowired
    private UserRepository userRepository;

    @GetMapping("/users")
    public List<User> retrievaAllUsers() {
        return userRepository.findAll();
    }

    @DeleteMapping("/users/{id}")
    public void deleteUser(@PathVariable Long id) {
        userRepository.deleteById(id);
    }

    @PostMapping("/users")
    public ResponseEntity<Object> createUser(@RequestBody User user) {
        User savedUser = userRepository.save(user);

        URI location = ServletUriComponentsBuilder.fromCurrentRequest()
                .path("/{id}")
                .buildAndExpand(savedUser.getId())
                .toUri();

        return ResponseEntity.created(location).build();

    }


}

-

@Entity
@Table(name = "user")
public class User {

    @Id
    @GeneratedValue
    private Long id;
    private String name;
    private String password;
    @Enumerated(EnumType.STRING)
    private Role role;

    public User() {
        super();
    }

    public User(Long id, String name, String password, Role role) {
        this.id = id;
        this.name = name;
        this.password = password;
        this.role = role;
    }

    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 String getPassword() {
        return password;
    }

    public void setPassword(String password) {
        this.password = password;
    }

    public Role getRole() {
        return role;
    }

    public void setRole(Role role) {
        this.role = role;
    }
}

• 编辑-添加角色类

  public enum Role {
  
  USER, ADMIN
  

  }