How map Child Object input json in jackson?

Question

I'm developing an application using java with hibernate 4.2.6 and spring 4.0.1. My application is a REST FULL application. for this I use jackson. My entities are as follow:

Calk.java:

@Entity
public class Calk {

    @Id
    @GeneratedValue
    private Long id;
    
    @OneToMany(mappedBy="calk", fetch=FetchType.LAZY)
    List<BaseLayer> baseLayer = new ArrayList<BaseLayer>();
    
    public void addBaseLayer(BaseLayer baseLayer){
        this.baseLayer.add(baseLayer);
    }
    
    public Long getId() {
        return id;
    }
    public void setId(Long id) {
        this.id = id;
    }

    @JsonIgnore
    public List<BaseLayer> getBaseLayer() {
        return baseLayer;
    }
    public void setBaseLayer(List<BaseLayer> baseLayer) {
        this.baseLayer = baseLayer;
    }
}

BaseLayer.java:

@Entity
@Inheritance(strategy=InheritanceType.TABLE_PER_CLASS)
@JsonTypeInfo(use=JsonTypeInfo.Id.NAME, include=JsonTypeInfo.As.PROPERTY, property="layer")
@JsonSubTypes(
{
    @JsonSubTypes.Type(value=PointLayer.class, name="point")
})
@DiscriminatorValue("BaseLayerDiscriminator")
public class BaseLayer {

    @Id
    @GeneratedValue
    protected Long gid;

    @ManyToOne(fetch = FetchType.LAZY)
    protected Calk calk;

    public Long getGid(){
        return gid;
    }

    public void setGid(Long gid){
        this.gid = gid;
    }
    
    @JsonIgnore
    public Calk getCalk(){
        return calk;
    }

    public void setCalk(Calk calk){
        this.calk = calk;
    }
}

Now I have a class that extends from BaseLayer.java as follow:
PointLayer.java:

@Entity
@DiscriminatorValue("PointDiscriminator")
public class PointLayer extends BaseLayer{
    
    private String name;
    
    public String getName() {
        return name;
    }
    public void setName(String name) {
        this.name = name;
    }
}

Now I create a json as follow and then send it to a controller:

{"layer": "point", "calk":{"id":1}, "name": "itsme"}

Now the controller defines as follow:

@RequestMapping("\test")
public String test(@RequestBody BaseLayer baseLayer){
   System.out.println(baseLayer.getName());// this print "itsme"
   Calk calk = baseLayer.getCalk();//it return null
   if(calk == null)
      return "its null";
   else
      return "its not null";
}

when we call the controller it return its not null. The calk should not be null.

Where is the problem?

Update:
When I remove @JsonIgnore at getCalk, It work fine. But Why? I want to ignore getCalk but NOT ignore setCalk.

you mean to say you want to set the value of `calk` but you dont want to get that value? — Sindhoo Oad, Nov 02 '15 at 05:20
I want to insert `baseLayer` record, and I want to know this `baseLayer` is which one of `calk`? — Morteza Malvandi, Nov 02 '15 at 05:35
http://stackoverflow.com/questions/12505141/only-using-jsonignore-during-serialization-but-not-deserialization this may help you — Sindhoo Oad, Nov 02 '15 at 07:21

score 0 · Accepted Answer · answered Nov 26 '15 at 04:32

@JsonIgnore in follow:

@JsonIgnore
public List<BaseLayer> getBaseLayer() {
    return baseLayer;
}

set Ignore to following by default:

public void setBaseLayer(List<BaseLayer> baseLayer) {
    this.baseLayer = baseLayer;
}

You must add @JsonProperty("baseLayer") On top of set function as follow:

@JsonProperty("baseLayer")
public void setBaseLayer(List<BaseLayer> baseLayer) {
    this.baseLayer = baseLayer;
}

How map Child Object input json in jackson?

1 Answers1