我有一個名為“員工”的實體，它與自己有聯系。聯接表示誰是該員工的經理。當我查詢記錄時，我得到了員工的整個層次結構。我希望實現的是只獲取經理的幾個字段，而不希望獲取員工的經理的經理。我嘗試使用但無法獲得預期的輸出來執行此操作。也使用過。@NamedEntityGraphProjections我還嘗試了這里提到的方法JPA 使用連接表進行自連接自加盟春聯歡注意 - 我不想使用注釋@Query@Entitypublic class Employee {    @Id    @Column(name = "employeeId", nullable = false)    private String employeeId;    @Column(name = "firstName", nullable = false)    private String firstName;    @Column(name = "lastName", nullable = false)    private String lastName;    @Column(name = "middleName")    private String middleName;    @Column(name = "dateOfJoining", nullable = false)    private LocalDate dateOfJoining;    @ManyToOne(cascade = CascadeType.ALL)    @JoinColumn(name = "line_manager_id")    private Employee manager;}實際結果 -{   "firstName":"Super",   "lastName":"Manager",   "middleName":"",   "dateOfJoining":"2012-12-31",   "manager":{      "firstName":"Super",      "lastName":"Manager",      "middleName":"",      "dateOfJoining":"2012-12-31",      "manager":{         "firstName":"Admin",         "lastName":"User",         "middleName":"",         "dateOfJoining":"2012-12-31",         "manager":{            "firstName":"Admin",            "lastName":"User",            "middleName":"",            "dateOfJoining":"2012-12-31",            "manager": null,            "employeeId":"P67"         },         "employeeId":"P68"      },      "employeeId":"P69"   },   "employeeId":"P70"}預期成果{   "firstName":"Super",   "lastName":"Manager",   "middleName":"",   "dateOfJoining":"2012-12-31",   "manager":{      "firstName":"Super",      "lastName":"Manager",      "employeeId":"P69"   },   "employeeId":"P70"}