Springboot POST API is returning 200 but no JSON

I am a little confused as to why my Spring service is not returning any content. I tried mvn clean install and I also see that the response POJO at the return statement line has actual data when I hit the breakpoint in debugger mode/print to console. Does anyone know what could be the cause?

My @RestController

    @Override    public MyServiceResponse getDesiredData(MyRequest myRequest)            throws IOException {        var resp = new MyServiceResponse();        var req = new ServiceRequest<MyRequest>();        req.setPayload(myRequest);        // this update the pass by reference resp object        myRequestProcessor.process(req, resp);        return resp; //at this breakpoint I see data in the debugging console    }

POJO:

@SuperBuilder@Data@NoArgsConstructor@JsonIgnoreProperties(ignoreUnknown = true)public class MyServiceResponse {    SessionInfo sessionInfo;}@SuperBuilder@Data@NoArgsConstructor@JsonIgnoreProperties(ignoreUnknown = true)public class SessionInfo {    Parameters parameters;}@SuperBuilder@Data@NoArgsConstructor@JsonIgnoreProperties(ignoreUnknown = true)public class Parameters {    @JsonProperty("zip")    String zip;    @JsonProperty("city")    String city;    @JsonProperty("state")    String state;    @JsonProperty("storeNum")    Integer storeNum;    @JsonProperty("startHrs")    String startHrs;    @JsonProperty("endHrs")    String endHrs;}