mybatis spring mvc application,获取无效的绑定语句(未找到)

这是我使用spring 3.2.4,mybatis-spring-1.2.1的第一个mybatis spring mvc应用程序

当我尝试调用我的web服务时,我收到错误::

org.springframework.web.util.NestedServletException: Request processing failed; 
nested exception is org.apache.ibatis.binding.BindingException: Invalid bound 
statement (not found): 
org.mydomain.formulary.drugmaster.dao.DrugMasterDao.getDrugsWithAlert

我一定错过了一些明显的东西.谢谢你的帮助

以下是我的相关文件: applicationContext.xml

映射文件 - > /classes/org/mydomain/formulary/mappers/drugmasterDao.xml

    Select drug_id,drug_name,drug_alert_date,drug_alert_source, rownum
    from (select drug_id,drug_name,to_char(drug_alert_datetime,'MM/DD/YYYY') as drug_alert_date ,drug_alert_source, rownum
    from drug_master
    where drug_status ='A' and length(drug_alert) > 0
    order by drug_alert_datetime DESC )
    where
    
        rownum < #{count}
    

映射文件 - > /classes/org/mydomain/formulary/drugmaster/dao/DrugMasterDao.java

public interface DrugMasterDao {
    public List getDrugsWithAlert(int count);
}

控制器文件 - > /classes/org/mydomain/formulary/drugmaster/controller/DrugMasterController.java

@Controller
public class DrugMasterController {
@Autowired
DrugMasterService drugMasterService;


@RequestMapping(value = "/drugmaster/withalerts/count/{count}", method = RequestMethod.GET)
public String withAlerts(ModelMap model, @PathVariable int count) {

    List drugs = drugMasterService.getDrugsWithAlert(count);

    return null/*for now*/;

}
}    

服务文件 - > /classes/org/mydomain/formulary/drugmaster/service/DrugMasterServiceImpl.java

@Service
public class DrugMasterServiceImpl implements DrugMasterService {

    @Autowired
    DrugMasterDao drugMasterDao;

    public List getDrugsWithAlert(int count){
        return drugMasterDao.getDrugsWithAlert(count);
    }
}

mybatis-configfile - >