Spring webFlux infinite recursion

So I'am trying Spring webFlux and have following code:

@Override
public Flux<? extends AnimalDatabaseEntity> queryAnimals() {
return async(animalsRepository.findAll().stream());
}

private <T> Flux<T> async(Stream<T> stream) {
return Flux.fromStream(stream).publishOn(scheduler);
}


The problem that I get infinite recursion, because "AnimalDatabaseEntity" has field animalFeatures.

@Entity(name = "animals")
public class AnimalDatabaseEntity {

@Id
@GeneratedValue(strategy = GenerationType.IDENTITY)
@Column(name = "id")
private Long id;

@Column(name = "name")
private String name;

@Enumerated(EnumType.STRING)
@Column(name = "animal_type")
private AnimalType animalType;

@Column(name = "number_of_legs")
private Integer numberOfLegs;

@Column(name = "is_pet")
private boolean isPet;

@OneToMany(mappedBy = "animalDatabaseEntity", fetch = FetchType.EAGER)
private List<AnimalFeatureEntity> animalFeatures;
}


I don't really get why this does not work???

1 Answer
1

My best guess is AnimalFeatureEntity contains varaible of type AnimalDatabaseEntity which references back to List<AnimalFeatureEntity> while serializing thus causing an infinite recursion.

You can prevent it by adding @JsonIgnore to AnimalDatabaseEntity if it suits your use case.
However, if you wish to preserve the bidirectional relationship, then @JsonManagedReference/@JsonBackReference or @JsonIdentityInfo is the way to go.
For example usage, refer this article

AnimalFeatureEntity

AnimalDatabaseEntity

List<AnimalFeatureEntity>

@JsonIgnore

AnimalDatabaseEntity

@JsonManagedReference/@JsonBackReference

@JsonIdentityInfo

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