[오류] JsonMappingException 오류 : infinite recursion

com.fasterxml.jackson.databind.JsonMappingException: Infinite recursion (StackOverflowError)

Data 는 File을 여러개 가지는 1:N 구조입니다.

아래와 같이 Data와 File은 양방향 설정을 한상태입니다.

public class Data {
…
     @OneToMany(fetch = FetchType.LAZY, cascade = CascadeType.ALL, mappedBy = "data")
    @JoinColumn(name="idx")
    private List file;
 
}

public class File {
…
    @ManyToOne(fetch = FetchType.LAZY, optional = false)
    @PrimaryKeyJoinColumn
    private Data data;
}

Data와 File 간의 join을 시도

public class DataService {
…
    public List getData() {
        
            List item = select()
            .from(qData)
            .join(qData.file, qFile).fetchJoin()
            .fetch();
    }
}

JPA의 @OneToMany 양방향 Data <-> File 설정 후 Join 시, 발생되는 JsonMappingException 오류

com.fasterxml.jackson.databind.JsonMappingException: Infinite recursion (StackOverflowError)
at com.fasterxml.jackson.databind.ser.std.BeanSerializerBase.serializeFields(BeanSerializerBase.java:706)
    at com.fasterxml.jackson.databind.ser.BeanSerializer.serialize(BeanSerializer.java:155)
    at com.fasterxml.jackson.databind.ser.BeanPropertyWriter.serializeAsField(BeanPropertyWriter.java:704)
    at com.fasterxml.jackson.databind.ser.std.BeanSerializerBase.serializeFields(BeanSerializerBase.java:690)
    at com.fasterxml.jackson.databind.ser.BeanSerializer.serialize(BeanSerializer.java:155)
    at com.fasterxml.jackson.databind.ser.std.CollectionSerializer.serializeContents(CollectionSerializer.java:149)
    at com.fasterxml.jackson.databind.ser.std.CollectionSerializer.serialize(CollectionSerializer.java:112)
Caused by: java.lang.StackOverflowError: null
    at java.lang.AbstractStringBuilder.ensureCapacityInternal(AbstractStringBuilder.java:125)
    at java.lang.AbstractStringBuilder.append(AbstractStringBuilder.java:448)
    at java.lang.StringBuilder.append(StringBuilder.java:136)
    at java.net.URLStreamHandler.parseURL(URLStreamHandler.java:254)
    at sun.net.www.protocol.file.Handler.parseURL(Handler.java:67)
…

[http-nio-8080-exec-8] WARN  org.hibernate.engine.jdbc.spi.SqlExceptionHelper:logExceptions:127 SQL Error: 1406, SQLState: 22001
[http-nio-8080-exec-8] ERROR org.hibernate.engine.jdbc.spi.SqlExceptionHelper:logExceptions:129 Data truncation: Data too long for column 'TRACE' at row 1

해결방법

애노테이션 @JsonManagedReference, @JsonBackReference 를 각각 붙여 줍니다.

public class Data {
…
 
    @OneToMany(fetch = FetchType.LAZY, cascade = CascadeType.ALL, mappedBy = "data")
    @JoinColumn(name="idx")
    @JsonManagedReference
    private List file;
 
}
 
public class File {
…
    @ManyToOne(fetch = FetchType.LAZY, optional = false)
    @PrimaryKeyJoinColumn
    @JsonBackReference
    private Data data;
}

오류가 사라졌습니다, 썩세스!!