Java实体里两个对象有关联关系，互相引用，比如，在一对多的关联关系里
Problem对象，引用了标签列表ProblemLabel
ProblemLabel对象，引用了所属Problem
这样构成了互相引用，导致递归循环内存溢出异常：
org.springframework.http.converter.HttpMessageNotWritableException: Could not write content: Infinite recursion (*Error) (through reference chain: com.test.api.problem.domain.ProblemLabel["problem"]->com.test.api.problem.domain.Problem["label"]->org.hibernate.collection.internal.PersistentBag[0]->com.test.api.problem.domain.ProblemLabel["problem"]->com.test.api.problem.domain.Problem["label"]->org.hibernate.collection.internal.PersistentBag[0]->com.test.api.problem.domain.ProblemLabel["problem"]
@JsonIgnoreProperties({"hibernateLazyInitializer", "handler"})
@Entity
@Table(name = "tx_test_problem")
public class Problem {
private static final long serialVersionUID = 761718569700121659L;
/**
* 问题概述
*/
private String qutline;
/**
* 问题补充
*/
private String supplement;
/**
* 创建时间
*/
private Date createDate;
private Account user;
private List<ProblemLabel> labeles;
public String getQutline() {
return qutline;
}
public void setQutline(String qutline) {
this.qutline = qutline;
}
public String getSupplement() {
return supplement;
}
public void setSupplement(String supplement) {
this.supplement = supplement;
}
@OneToOne(fetch = FetchType.EAGER)
@JoinColumn(name = "user_id")
public Account getUser() {
return user;
}
public void setUser(Account user) {
this.user = user;
}
@Column(updatable = false)
public Date getCreateDate() {
return createDate;
}
public void setCreateDate(Date createDate) {
this.createDate = createDate;
}
@OneToMany(mappedBy = "problem", fetch = FetchType.EAGER) //主表上添加mappedBy，指向关联表的关联实体problem即可
public List<ProblemLabel> getLabel() {
return labeles;
}
public void setLabel(List<ProblemLabel> labeles) {
this.labeles = labeles;
}
}
Problem包含了标签列表private List<ProblemLabel> labeles;
@JsonIgnoreProperties({"hibernateLazyInitializer", "handler"})
@Entity
@Table(name = "tx_test_problem_label")
public class ProblemLabel {
private static final long serialVersionUID = -789585899105406906L;
private String labelVal;
private String problemId;
private Problem problem;
@ManyToOne
@JoinColumn(name = "problem_id")
public Problem getProblem() {
return problem;
}
public void setProblem(Problem problem) {
this.problem = problem;
}
public String getLabelVal() {
return labelVal;
}
public void setLabelVal(String labelVal) {
this.labelVal = labelVal;
}
}
ProblemLabel包含了标签列表private Problem problem;
在不需要展现一方的属性上添加忽略注解@JsonIgnore即可。修改后的ProblemLabel如下。
@JsonIgnoreProperties({"hibernateLazyInitializer", "handler"})
@Entity
@Table(name = "tx_test_problem_label")
public class ProblemLabel {
private static final long serialVersionUID = -789585899105406906L;
private String labelVal;
private String problemId;
private Problem problem;
@ManyToOne
@JoinColumn(name = "problem_id")
@JsonIgnore //将不需要返回的属性上添加忽略
public Problem getProblem() {
return problem;
}
public void setProblem(Problem problem) {
this.problem = problem;
}
public String getLabelVal() {
return labelVal;
}
public void setLabelVal(String labelVal) {
this.labelVal = labelVal;
}
}
这样便可解决bean互相引用返回json数据时递归调用的问题。
本文转自秋楓博客园博客，原文链接：http://www.cnblogs.com/rwxwsblog/p/5853754.html，如需转载请自行联系原作者