Jackson JSON infinite recursion without omiting anything from the serialization - json

Question

I want to serialize and eventually deserialize an object to perform an export/import operation. I use Jackson library because of the extend annotation provided. I do break the infinite recursion by using the latest tags #JsonManagedReference, #JsonBackReference. But the problem here #JsonBackReference does omit the annotated part from the json file so I am not able to set the relationship while importing.
The relationship btwn entities can be shown:
public class A{
#Id
#Column(name = "ID", unique = true, precision = 20)
#SequenceGenerator(name = "a_generator", sequenceName =
"SEQ_A", initialValue = 1, allocationSize = 1)
#GeneratedValue(strategy = GenerationType.SEQUENCE, generator =
"a_generator")
private Long id;
#OneToMany(cascade = CascadeType.ALL, mappedBy = "metricDefinition",
fetch = FetchType.LAZY, orphanRemoval = true)
#Fetch(FetchMode.SELECT)
#NotAudited
#JsonManagedReference
private Set<B> bSet= new HashSet<B>();
}
public class B{
#Id
#Column(name = "id", unique = true, precision = 20)
#SequenceGenerator(name = "b_generator", sequenceName = "seq_b", initialValue = 1, allocationSize = 1)
#GeneratedValue(strategy = GenerationType.SEQUENCE, generator = "b_generator")
private Long id;
#ManyToOne(cascade = {CascadeType.REFRESH})
#JoinColumn(name = "a_id")
#Fetch(FetchMode.SELECT)
#JsonBackReference(value = "a-b")
private A a;
#ManyToOne(cascade = {CascadeType.REFRESH})
#JoinColumn(name = "ref_a_id")
#Fetch(FetchMode.SELECT)
#JsonBackReference(value = "a-ref")
private A refA;
#Column(name = "is_optional")
#Fetch(FetchMode.SELECT)
private boolean isOptional;
#Column(name = "name")
#Fetch(FetchMode.SELECT)
private String name;
When I serialize any A object, it does serialize the B's included but the referenced A and refA are omitted. So, when I import A object of course the B's are also imported but I do want to the relationship between the objects to be set.
Is there any idea how can I break the infinite recursion without omitting the one side of the reference?
Thanks in advance

Answer 1

I did also try to use statement below according to answers given similar questions but it did not work so I asked the question above.
#JsonIdentityInfo(generator = ObjectIdGenerators.PropertyGenerator.class,
property = "#id")
it does not sufficient to break the circle. You should also add below annotation to the id property of your class.
#JsonProperty("id")

Answer 2

We can try to break the loop either at the Parent end or at the Child end by following 3 ways
Use #JsonManagedReference and #JsonBackReference
Use #JsonIdentityInfo
Use #JsonIgnore
Use #JsonIdentityInfo
#Entity
#Table(name = "nodes")
#JsonIdentityInfo(
generator = ObjectIdGenerators.PropertyGenerator.class,
property = "id")
public class Node {
...
}
#Entity
#Table(name = "relations")
#JsonIdentityInfo(
generator = ObjectIdGenerators.PropertyGenerator.class,
property = "id")
public class Relation {
...
}
Refer more in detail here with the working demo at the end.