Finished part 5.7

src/main/java/dtos/error/RestExceptionHandler.java

 package dtos.error;
 
 import io.zipcoder.tc_spring_poll_application.exception.ResourceNotFoundException;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.context.MessageSource;
 import org.springframework.http.HttpStatus;
 import org.springframework.http.ResponseEntity;
 import org.springframework.validation.FieldError;
 
 @ControllerAdvice
 public class RestExceptionHandler {
+
+    @Autowired()
+    private MessageSource messageSource;
+
     @ExceptionHandler(ResourceNotFoundException.class)
     public ResponseEntity<?> handleResourceNotFoundException(ResourceNotFoundException rnfe, HttpServletRequest request) {
         ErrorDetail errorDetail = new ErrorDetail();
             }
             ValidationError validationError = new ValidationError();
             validationError.setCode(fe.getCode());
-            validationError.setMessage(fe.getDefaultMessage());
+            validationError.setMessage(messageSource.getMessage(fe,null));
             validationErrorList.add(validationError);
         }
         errorDetail.setTimeStamp(new Date().getTime());

src/main/resources/messages.properties

+NotEmpty.poll.question=Question is a required field
+Size.poll.options=Options must be greater than {2} and less than {1}