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;
}

Solution

It turns out that in my specific case there is another class in the service package that implements the following:

@Pointcut(value = "execution(public * *(..))")
public void publicMethod() {
}

/**
 * @see https://docs.spring.io/spring-framework/docs/5.2.9.RELEASE/spring-framework-reference/core.html#aop-pointcuts-combining
 */
@Pointcut(value = "within(com.example.api.service.MyServiceControllerImpl)")
public void forServiceClass() {
}

@Around("publicMethod() && forServiceClass()")
public Object processorLogging(ProceedingJoinPoint proceedingJoinPoint) throws Throwable { ... }

Due to this, the processorLogging is called before and after the API method is called in ControllerImpl. Inside this method the logic did not support a new POJO as the response object so I needed to add that support. Since this is implied behavior, I would verify that there are no additional logic executed past the return of the response in the controller method.