How avoid infinite loop during Json Serialization in Java

Question

I retrieve a list of Brothers using hibernate

public class Brother {
    public int brotherId;
    public string name;

    public List<Brother> brothers;

    public Brother()
    {
        brothers = new ArrayList<Brother>();
    }

    //Getter Setter
}

Hibernate is configured using lazy select in brothers list, this in Java side works, But the problem is when I want to serialize a Brother object to JSON.

I've got org.codehaus.jackson.map.JsonMappingException: Infinite recursion (StackOverflowError)

for Example Bryan can have Mark as brother an viceversa...

How I can solve it? is there any way to indicate max number of recursion to jackson libraries?

my code, it is really simple.

Brother brother = this.myservice.getBrother(4);
ObjectMapper mapper = new ObjectMapper();
System.out.println(mapper.writeValueAsString(brother));

You can use `@JsonIgnore` and for Jackson > 1.6 use : `@JsonManagedReference`, `@JsonBackReference` on attributes to avoid infinite recursion. — sol4me, Dec 15 '14 at 20:19
I will test. but if I use JsonIgnore the brother list will be ignored, I don't want that. will @JsonBackReference generate something like this? { "brotherId": 4, "name": "bryan", "brothers": [ { "brotherId": 3, "name": "mark", "brothers": null } ] } — UserMan, Dec 15 '14 at 20:29
Can you post more code , and sample input / output . Also from future please use @sol4me that way I will be notified if you will write something to me. — sol4me, Dec 15 '14 at 20:58

score 4 · Accepted Answer · edited May 23 '17 at 11:51

4

Issue is arising because of Circular Reference.

Since Jackson 1.6 you can use two annotations to solve the infinite recursion problem without ignoring the getters/setters during serialization: @JsonManagedReference and @JsonBackReference.

refer here for more

edited May 23 '17 at 11:51

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answered Dec 16 '14 at 05:28

Ankur Singhal

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How avoid infinite loop during Json Serialization in Java

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