Question

I’m using Gson 2.2‘s toJson() method to serialize a java object into a json string. The java object is of type:

public class LOB implements Serializable{
    private int id;
    private LOBType type; 

    private TypeSpecificData data;

    public class TypeSpecificData {
        private String a;
        private int b;
    } 

}

All fields of the object are serialized except for data field of type TypeSpecificData.

How do I include this field as well in the json string ?

Currently I’m serializing like shown below:

String jsonString = new Gson().toJson(lob_instance);

Answer 1

By default Gson will not serialize null objects refereces. Please check it.

Link to GSON documentation