Gson deserialization to java object does not work

Question

The JSON string is {"status":0} or {"status":300} and the Java class

public class MyResponse {
    private Integer status;

    public Integer getStatus() {
        return status;
    }

    public void setStatus(Integer status) {
        this.status = status;
    }

    @Override
    public String toString() {
        return "MyResponse{" +"status=" + status +'}';
    }
}

When status field is an Integer it is converted to null for all incoming values. When it is of type int only 0 is deserialized correctly. Other values are converted to null.

What am I missing?

Here is how I am trying to deserialize

Gson gson = new GsonBuilder()
    .setFieldNamingPolicy(FieldNamingPolicy.UPPER_CAMEL_CASE)
    .setPrettyPrinting().create();
gson.fromJson(json.toString(), MyResponse.class);

Answer 1

You need to remove the setFieldNamingPolicy(FieldNamingPolicy.UPPER_CAMEL_CASE) .

If you leave it, then it expects the field in your class to be named Status and not status as stated in the documention : someFieldName ---> SomeFieldName