Spring Boot - entity to json - recursive - json

Question

I have entities with bidirectional mapping to each other. Calling REST Http.GET request to get all records from db, I am receiving StackOverflowException due to infinite recursion. I was trying to use #JsonIgnore, #JsonBackReference together with #JsonManageReference and #JsonIdentityInfo in different combinations, but with no positive result. I am still receiving the error.
Spring Boot loads me jackson in version 2.6.6.
Here is my BaseEntity:
#MappedSuperclass
public class BaseEntity {
#Id
#GeneratedValue
private Long id;
private String createdBy;
private Date createdOn;
private String modifiedBy;
private Date modifiedOn;
public String description;
public BaseEntity() {
}
public Long getId() {
return id;
}
public void setId(Long id) {
this.id = id;
}
public String getCreatedBy() {
return createdBy;
}
public void setCreatedBy(String createdBy) {
this.createdBy = createdBy;
}
public Date getCreatedOn() {
return createdOn;
}
public void setCreatedOn(Date createdOn) {
this.createdOn = createdOn;
}
public String getModifiedBy() {
return modifiedBy;
}
public void setModifiedBy(String modifiedBy) {
this.modifiedBy = modifiedBy;
}
public Date getModifiedOn() {
return modifiedOn;
}
public void setModifiedOn(Date modifiedOn) {
this.modifiedOn = modifiedOn;
}
public String getDescription() {
return description;
}
public void setDescription(String description) {
this.description = description;
}
}
First Entity class:
#Entity
public class Entry extends BaseEntity{
private Date businessOperationDate;
#ManyToOne
private Version version;
#ManyToOne
private Status status;
#ManyToOne
#JsonManagedReference
private Account account;
public Entry() {
}
public Date getBusinessOperationDate() {
return businessOperationDate;
}
public void setBusinessOperationDate(Date businessOperationDate) {
this.businessOperationDate = businessOperationDate;
}
public Version getVersion() {
return version;
}
public void setVersion(Version version) {
this.version = version;
}
public Status getStatus() {
return status;
}
public void setStatus(Status status) {
this.status = status;
}
public Account getAccount() {
return account;
}
public void setAccount(Account account) {
this.account = account;
}
}
and the second one:
#Entity
public class Account extends BaseEntity{
private String number;
#OneToMany(mappedBy = "account", fetch = FetchType.EAGER)
#JsonBackReference
private List<Entry> entries;
#ManyToMany(mappedBy = "accounts")
private List<Project> projects;
public Account() {
}
public String getNumber() {
return number;
}
public void setNumber(String number) {
this.number = number;
}
public List<Entry> getEntries() {
return entries;
}
public void setEntries(List<Entry> entries) {
this.entries = entries;
}
public List<Project> getProjects() {
return projects;
}
public void setProjects(List<Project> projects) {
this.projects = projects;
}
}
Here you can find part of result received from Http.GET request:
[{"id":1,"createdBy":null,"createdOn":null,"modifiedBy":null,"modifiedOn":null,"description":"pierwszy zapis","businessOperationDate":null,"version":null,"status":null,"account":{"id":1,"createdBy":null,"createdOn":null,"modifiedBy":null,"modifiedOn":null,"description":"pierwszy projekt","number":null,"entries":
[{"id":1,"createdBy":null,"createdOn":null,"modifiedBy":null,"modifiedOn":null,"description":"pierwszy zapis","businessOperationDate":null,"version":null,"status":null,"account":{"id":1,"createdBy":null,"createdOn":null,"modifiedBy":null,"modifiedOn":null,"description":"pierwszy projekt","number":null,"entries":
[{"id":1,"createdBy":null,"createdOn":null,"modifiedBy":null,"modifiedOn":null,"description":"pierwszy zapis","{"timestamp":1468778765328,"status":200,"error":"OK","exception":"org.springframework.http.converter.HttpMessageNotWritableException","message":
"Could not write content: Infinite recursion (StackOverflowError) (through reference chain: com.test.test2.core.dto.AccountDto[\"entries\"]->
java.util.ArrayList[0]->com.test.test2.core.dto.EntryDto[\"account\"]->com.test.test2.core.dto.AccountDto[\"entries\"]->
java.util.ArrayList[0]->com.test.test2.core.dto.EntryDto[\"account\"]->com.test.test2.core.dto.AccountDto[\"entries\"]->java.util.ArrayList[0]->com.test.test2.core.dto.EntryDto[\"account\"]->com.test.test2.core.dto.AccountDto[\"entries\"]->
java.util.ArrayList[0]->com.test.test2.core.dto.EntryDto[\"account\"]-
pom.xml file:
<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>com.test</groupId>
<artifactId>test2</artifactId>
<version>0.0.1-SNAPSHOT</version>
<packaging>jar</packaging>
<name>test2</name>
<description>test2</description>
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>1.3.5.RELEASE</version>
<relativePath/> <!-- lookup parent from repository -->
</parent>
<properties>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
<java.version>1.8</java.version>
</properties>
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-actuator</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-data-jpa</artifactId>
</dependency>
<!--<dependency>-->
<!--<groupId>org.springframework.boot</groupId>-->
<!--<artifactId>spring-boot-starter-security</artifactId>-->
<!--</dependency>-->
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
<groupId>org.postgresql</groupId>
<artifactId>postgresql</artifactId>
<scope>runtime</scope>
<version>9.4-1201-jdbc41</version>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</dependency>
<!-- model mapper -->
<dependency>
<groupId>ma.glasnost.orika</groupId>
<artifactId>orika-core</artifactId>
<version>1.4.6</version>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>
</plugins>
</build>
</project>
Please advise, what I am doing wrong. I wish to receive in a result only one level, e.g. calling getAll() for entry, I wish to receive all entries with information which account is related, and in opposite once calling getAll() for account.

Answer 1

i search more times for this error,but i can meet anything i get this error case and i correct it by adding the annotation #JsonIgnore in some relation mapping,
this is example
#ManyToMany(mappedBy = "accounts")
#JsonIgnore
private List<Project> projects;