Spring – Infinite loop with spring-boot in a one to many relation

springspring-bootspring-restcontroller

In a rest application, I use spring boot with jpa.

I have a class Lodger

who have

@OneToMany(cascade = CascadeType.ALL, fetch = FetchType.LAZY, mappedBy = "lodger")
private List<Reference> referenceList;

In my class Reference, i have

@ManyToOne
@JoinColumn(name = "lodgerId")
private Lodger lodger;

when i call this method

@RequestMapping(value = "/lodgers/{lodgerId}", method = RequestMethod.GET)
public Lodger getLogderById(@PathVariable("lodgerId") long lodgerId) {
    return lodgerService.getLodger(lodgerId);
}

I get this error

org.springframework.http.converter.HttpMessageNotWritableException: Could not write content: Infinite recursion (StackOverflowError) (through reference chain: server.bean.Lodger["referenceList"]->org.hibernate.collection.internal.PersistentBag[0]->server.bean.Reference["lodger"]->server.bean.Lodger["referenceList"]->org.hibernate.collection.internal.PersistentBag[0]->server.bean.Reference["lodger"]->server.bean.Lodger["referenceList"]...

Best Solution

Solution:

Use

@JsonManagedReference annotation for the first objects instantiated

@JsonBackReference annotation for the second objects instantiated

First:

@JsonManagedReference
@OneToMany(cascade = CascadeType.ALL, fetch = FetchType.LAZY, mappedBy = "lodger")
    private List<Reference> referenceList;

Second:

@JsonBackReference
@ManyToOne
    @JoinColumn(name = "lodgerId")
    private Lodger lodger;