@Id
    @GeneratedValue
    public Long getId() {
        return id;
    }

默认是自增从1开始。

如果设置初始值自增需要使用

 @Id
  @GeneratedValue(strategy = GenerationType.SEQUENCE,generator="mySeqGenerator")
  @SequenceGenerator(name = "mySeqGenerator", sequenceName = "t_teacher_sequence", initialValue = 1000, allocationSize = 50)
  public int getId(){
    return id;
  }

但是这种sequence不支持mysql，