service會不會因repository而變得也很薄

public ToShortMessage getToShortMessage(Long msgId) {
		logger.debug("ShortMessageServiceImp getToShortMessage");
		ShortMessage smsg = this.repository.findShortMessage(msgId);		
		Account loginaccount = this.sessionContextUtil.getLoginAccount(sessionContext);
		//check auth
		if (!smsg.getMessageTo().equals(loginaccount.getUsername())){
			logger.error("msgId="+ msgId +" is not this user's =" + loginaccount.getUserId());
			return null;
		}
		ToShortMessage tosmsg = new ToShortMessage();
		try {
			PropertyUtils.copyProperties(tosmsg, smsg);
		} catch (Exception e) {
			e.printStackTrace();
		}

		return tosmsg;
	}