how to deserialize one to many relationship with both eager sides without ending up in infinite deserialization loop

问题

here is my Product class

@Entity
public class Product {

    @ManyToOne(fetch=FetchType.EAGER)
    @JoinColumn(name="listingGroup_id")
    @JsonBackReference
    public ListingGroup listingGroup;

and here is my groupProduct class

@Entity
public class GroupProduct {

    @OneToMany(mappedBy = "listingGroup", fetch = FetchType.EAGER)
    @JsonManagedReference
    Set<Product> products;

GAOL:

1. When I query for product, I want product with ProductGroup (ProductGroup should not serialize again the products inside)
2. When I query GroupProduct, I want the products inside (without these list of products each including again the GroupProduct)

ALREADY TRIED

1. JsonBackReference, JsonManagedReference:

   The GroupProduct get everything fine, but

   Problem : the deserialized products does not contain the group Product : {id: 1, ... groupProduct: null}

2. JsonIdentityInfo : I am not able anymore to deserialize the objects java.lang.IllegalArgumentException: No converter found for return value of type...

Environment

• spring boot 1.5.8
• hibernate 5.0.12
• 'jackson-annotations', version: '2.8.0'
• 'jackson-databind', version: '2.8.7'

回答1:

I think you need @JsonIgnoreProperties annotation, like this:

@JsonIgnoreProperties("products")
public ListingGroup listingGroup;

or like this:

@JsonIgnoreProperties("listingGroup")
Set<Product> products;

or both.

来源：https://stackoverflow.com/questions/49530737/how-to-deserialize-one-to-many-relationship-with-both-eager-sides-without-ending