Spring Boot 无法从数据库获取数据当

q7solyqu  于 2023-01-30  发布在  Spring
关注(0)|答案(1)|浏览(130)


我在尝试从数据库中提取数据时遇到错误(数据存在于数据库中)。我可以在数据库中没有数据时执行操作。这是我的实体:

@Table(name = "tbl_task")
public class Task {

@Id
@GeneratedValue(strategy = GenerationType.AUTO)
private Long taskId;
private String title;
private String description;
private Status status;
@ManyToOne
@JoinColumn(name = "user_id")
private User assignee;
@OneToMany(mappedBy = "task", cascade = CascadeType.ALL, orphanRemoval = true)
private List<Comment> comments;

以及:

@Entity
@Table(name = "tbl_user")
public class User {
@Id
@GeneratedValue(strategy = GenerationType.AUTO)
private Long userId;
private String name;
@Column(unique = true)
private String email;
private Active active;
private String password;
@OneToMany(mappedBy = "assignee", cascade = CascadeType.ALL, orphanRemoval = true)
private List<Task> tasks;
@OneToMany(mappedBy = "user", cascade = CascadeType.ALL, orphanRemoval = true)
private List<Comment> comments;

错误为:

Servlet.service() for servlet [dispatcherServlet] in context with path [] threw 
exception [Request processing failed; nested exception is 
org.springframework.http.converter.HttpMessageNotWritableException: Could not write 
JSON: Infinite recursion (StackOverflowError); nested exception is 
com.fasterxml.jackson.databind.JsonMappingException: Infinite recursion 
(StackOverflowError) (through reference chain: 
com.tasksmanagement.entity.Task["assignee"]- 
>com.tasksmanagement.entity.User["tasks"]- 
>org.hibernate.collection.internal.PersistentBag[0]

方法如下:

public List<TaskResponse> getAllTasks() {
    List<Task> tasks = taskRepository.findAll();
    return

tasks.stream} }
你知道怎么解决吗?
谢谢

j5fpnvbx

j5fpnvbx1#

我在User类(List tasks字段)中添加了@JsonManagedReference,并在Task类(User assignee字段)中添加了@JsonBackReference,这样就解决了这个问题

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