这只是一个小提醒
这里有两种方式，很简单
1、在application.properties中配置

#懒加载配置
spring.jpa.properties.hibernate.enable_lazy_load_no_trans=true

2、在entity中添加注解

• 在关联对象上添加@JsonBackReference
• 在类上添加@JsonIgnoreProperties("roles")，括号中填写不需要查出的对象

@Entity
@Table(name = "users")
//@JsonIgnoreProperties("roles")
public class User implements Serializable {
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    @Id
    private int id;
    @Column
    private String name;
    @Column(name = "created_at")
    @DateTimeFormat(pattern = "yyyy-MM-dd HH:mm:ss")
    private Date createdAt;
    @ManyToOne
    @JoinColumn(name = "dep_id")
    @JsonBackReference //防止关系对象的递归访问
    private Department department;
    @ManyToMany(cascade = {}, fetch = FetchType.EAGER)
    @JoinTable(name = "user_role",    joinColumns = {@JoinColumn(name = "user_id")},    inverseJoinColumns = {@JoinColumn(name = "role_id")})
    @JsonBackReference
    private List<Role> roles = new ArrayList<>();
    ......
}