spring @Qualifier得到的bean为null 求解

xml文件配置

实现类:
@Implementation
@Repository( "profilesdbDao" )
public class ProfilesDaoImpl implements ProfilesDao
{

注入地方:
@Service
@Configurable( dependencyCheck = true )
public class ResourceProfileLoaderNew
{

/** The log. */ 
Logger log = Logger.getLogger( ResourceProfileLoaderNew.class.getName() ); 

/** The status. */ 
static boolean status; 

/** The pdao. */ 
@Autowired 
@Qualifier( "pDao" ) 
private ProfilesDao pdao; 

tomcat启动没有任何异常 运行的时候pdao就为null !求解