org.codehaus.jackson.map.JsonMappingException: Infinite recursion (StackOverflowError)

Question

I am trying out some very basic webservice. I get this exception everytime I try to return the Prtnr object.

Uncaught exception thrown in one of the service met         


        

Answer 1

In this link you can find how to solve this.

However below I'll paste the solution in practice.

It's very simple. Assuming that your database query already works without JSON, all you have to do is this:

Add the @JsonManagedReference In the forward part of the relationship (i.e. User.java class):

@Entity
public class User implements java.io.Serializable{

 @Id
 @GeneratedValue(strategy=GenerationType.IDENTITY)
 private long id;

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

 @ManyToMany
 @JoinTable(name="users_roles",joinColumns=@JoinColumn(name = "user_fk"),
 inverseJoinColumns=@JoinColumn(name = "role_fk"))
 @JsonManagedReference
 private Set roles = new HashSet();

...

Add the @JsonBackReference In the back part of the relationship (i.e. Role.java class):

@Entity
public class Role implements java.io.Serializable {

 @Id 
 @GeneratedValue(strategy=GenerationType.IDENTITY)
 private int id;

 @ManyToMany(mappedBy="roles")
 @JsonBackReference
 private Set users = new HashSet();

...

The work is done. If you take a look at your firebug logs, you'll notice that the infinite recursive loop has disappeared.