private void checkNameString (String sentName) throws ValidationException {
	    if (sentName != null && !sentName.isEmpty() ) {
	        if (sentName.length() < 4) {
	            throw new ValidationException("Name is too short. The length is " + sentName.length() + " and should be longer than 3");
	        }	        
        }
	    else {
	        throw new ValidationException("Name should not be null");
	    }
	}