Spring Boot Exception Handler that parses Response status annotation on the Exception class

RestResponseEntityExceptionHandler.java

package edu.wgu.dm.config;

import java.io.IOException;
import java.lang.reflect.InvocationTargetException;
import javax.servlet.http.HttpServletResponse;
import org.springframework.http.HttpStatus;
import org.springframework.web.bind.annotation.ControllerAdvice;
import org.springframework.web.bind.annotation.ExceptionHandler;
import org.springframework.web.bind.annotation.ResponseBody;
import org.springframework.web.bind.annotation.ResponseStatus;
import org.springframework.web.servlet.mvc.method.annotation.ResponseEntityExceptionHandler;
import lombok.NonNull;
import lombok.extern.slf4j.Slf4j;

@ControllerAdvice
@Slf4j
public class RestResponseEntityExceptionHandler extends ResponseEntityExceptionHandler {

    @ExceptionHandler(value = {Exception.class})
    @ResponseBody
    protected void handleException(Exception ex, HttpServletResponse response) throws IOException {

        Object statusCode = null;
        Object reason = null;
        ResponseStatus annotation = ex.getClass()
                                      .getAnnotation(ResponseStatus.class);
        if (annotation != null) {
            statusCode = executeMethod(annotation, "value");
            reason = executeMethod(annotation, "reason");
        }

        // Default setting if we don't get response code from the ResponseStatus annotation
        if (statusCode == null) {
            statusCode = HttpStatus.INTERNAL_SERVER_ERROR;
        }

        if (reason == null) {
            reason = (ex.getMessage() != null ? ex.getMessage() : "");
        }

        log.error("Exception:" + reason.toString(), ex);
        response.sendError(Integer.parseInt(statusCode.toString()), reason.toString());
    }

    private Object executeMethod(@NonNull ResponseStatus annotation, String method) {
        Object result = null;
        try {

            result = annotation.annotationType()
                               .getDeclaredMethod(method)
                               .invoke(annotation, (Object[]) null);
        } catch (IllegalAccessException | IllegalArgumentException | InvocationTargetException | NoSuchMethodException
                | SecurityException e) {

            log.error("Error in reading ResponseStatus annotation: ", e);
        }
        return result;
    }
}