Jersey: Json array with 1 element is serialized as object

Question

I\'m creating a REST server with Jersey/Java and I found a strange behavior.

I have a method on the server that returns an array of objects as Json

@         


        

Answer 1

Converting the Array into ArrayList would suffice the requirement here. Similar kind of contradictory issue I have faced, where I had to return the Json Array Object instead of list in case of single element.

There i took the help of below annotation to get my job done-

@JsonFormat(with = JsonFormat.Feature.WRITE_SINGLE_ELEM_ARRAYS_UNWRAPPED). Below is the example of a JSON Pojo class:

import java.util.List;

import com.fasterxml.jackson.annotation.JsonFormat;
import com.fasterxml.jackson.annotation.JsonIgnoreProperties;
import com.fasterxml.jackson.annotation.JsonProperty;

@JsonIgnoreProperties(ignoreUnknown = true)
public class TAResponseMapper {

    @JsonProperty("Response")
    @JsonFormat(with = JsonFormat.Feature.WRITE_SINGLE_ELEM_ARRAYS_UNWRAPPED) 
    private List responses;

    public List getResponses() {
        return responses;
    }

    public void setResponses(List responses) {
        this.responses = responses;
    }

}