近期在看springdatajpa多表查詢的時候,運用注解@ManyToOne(),@ManyToMany的時候,出現死循環,
老是報錯Detail formatter error: An exception occurred: java.lang.StackOverflowError
自己死磕了兩天才發現問題的解決方法,是以記錄下 防止後面再次入坑。
前期有排查spring 前端解析json是不是有問題,使用Specification的方法是否有問題,
以ManyToOne為例,需要在字段上添加@JsonIgnore注解
@Entity
@Table(name = "tbl_dep")
public class DepModel implements Serializable {
private static final long serialVersionUID = -1215166740441717912L;
@Id
private Integer uuid;
private String name;
//表示在tbl_dep裡面有user_id的字段
@JsonIgnore
@ManyToOne()
@JoinColumn(name = "user_id", nullable = false)
private UserModel um = new UserModel();
public Integer getUuid() {
return uuid;
}
public void setUuid(Integer uuid) {
this.uuid = uuid;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public UserModel getUm() {
return um;
}
public void setUm(UserModel um) {
this.um = um;
}
@Override
public String toString() {
return "DepModel [uuid=" + uuid + ", name=" + name + ", um=" + um + "]";
}
}
@Entity
@Table(name = "tbl_dep")
public class DepModel implements Serializable {
private static final long serialVersionUID = -1215166740441717912L;
@Id
private Integer uuid;
private String name;
//表示在tbl_dep裡面有user_id的字段
@JsonIgnore
@ManyToOne()
@JoinColumn(name = "user_id", nullable = false)
private UserModel um = new UserModel();
public Integer getUuid() {
return uuid;
}
public void setUuid(Integer uuid) {
this.uuid = uuid;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public UserModel getUm() {
return um;
}
public void setUm(UserModel um) {
this.um = um;
}
@Override
public String toString() {
return "DepModel [uuid=" + uuid + ", name=" + name + ", um=" + um + "]";
}
}