我在 Spring Boot 應用程序中遇到控制器問題。當我在控制器上進行調用（URI/調用）時，對象列表始終為空。{ "code": "TEST", "name": "TEST NAME", "groupe": "A1", "list": [ {"type":"web", "link":"https://google.com/"}, {"type":"web", "link":"https://google2.com/"} ]}@PostMapping(value="/call") public ResponseEntity<Void> ajouterEnvironnement(@RequestBody First first) { first.getCode() // value : "TEST" first.getList() // value : null}public class First { @Id @GeneratedValue(strategy = GenerationType.IDENTITY) private int id; private String code; private String name; private String groupe; @OneToMany(mappedBy = "first", cascade = CascadeType.ALL, fetch = FetchType.EAGER) private List<Second> list;}public class Second { @Id @GeneratedValue(strategy = GenerationType.IDENTITY) private int id; private String type; private String link; @ManyToOne(fetch = FetchType.EAGER) @JoinColumn(name = "first_id", nullable = false) private First first;}
1 回答
浮云間
TA貢獻1829條經驗 獲得超4個贊
通過寫這個問題，我找到了解決方案，所以我分享一下：
使用@JsonManagedReference和@JsonBackReference注釋。
public class First {
? ? @Id
? ? @GeneratedValue(strategy = GenerationType.IDENTITY)
? ? private int id;
? ? private String code;
? ? private String name;
? ? private String groupe;
? ? @OneToMany(mappedBy = "first", cascade = CascadeType.ALL, fetch = FetchType.EAGER)
? ? @JsonManagedReference
? ? private List<Second> listLiens;
}
public class Second {
? ? @Id
? ? @GeneratedValue(strategy = GenerationType.IDENTITY)
? ? private int id;
? ? private String type;
? ? private String link;
? ? @ManyToOne(fetch = FetchType.EAGER)
? ? @JsonBackReference
? ? @JoinColumn(name = "first_id", nullable = false)
? ? private First first;
}
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