spring4gwt error:Spring bean not found: querySenior

I am trying to make gwt-2.7 work with spring-4.2.3.Configurations are:

web.xml

<!-- spring config -->  <context-param>      <param-name>contextConfigLocation</param-name>      <param-value>/WEB-INF/applicationContext.xml</param-value>  </context-param>  <listener>      <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>  </listener>    <!-- Spring GWT integration -->  <servlet>      <servlet-name>springGwtRemoteServiceServlet</servlet-name>      <servlet-class>org.spring4gwt.server.SpringGwtRemoteServiceServlet</servlet-class>  </servlet>  <servlet-mapping>      <servlet-name>springGwtRemoteServiceServlet</servlet-name>      <url-pattern>/idp_web/service/*</url-pattern>  </servlet-mapping>

applicationContext.xml

<beans   ...  http://www.springframework.org/schema/beans/spring-beans-4.2.xsd   ....  default-lazy-init="true">    <!-- auto-inject bean by annotation mechanism -->  <context:component-scan      base-package="com.vsi.idp.analysis.server,                      com.vsi.idp.base.server,                      com.vsi.idp.kpi.server,                      com.vsi.idp.map.server,                      com.vsi.idp.statistics.server" />         //other configurations  </beans>

GWT services

@RemoteServiceRelativePath("service/querySenior")  public interface SeniorQueryService extends RemoteService{...}

service impl

@Service("querySenior")  public class SeniorQueryServiceImpl extends RemoteServiceServlet implements SeniorQueryService{...}

Spock unit test works fine

@ContextConfiguration(locations = "file:war/WEB-INF/applicationContext.xml")  public class SeniorQueryServiceImplTest extends Specification{      @Autowired    SeniorQueryServiceImpl service      def "query by full address"(){        //blabla    }  }

Running gwt project tells:

Failed to load resource: the server responded with a status of 500 (Server Error)

Error stack looks like:

[WARN] Exception while dispatching incoming RPC call  java.lang.IllegalArgumentException: Spring bean not found: querySenior  at org.spring4gwt.server.SpringGwtRemoteServiceServlet.getBean(SpringGwtRemoteServiceServlet.java:96)  at org.spring4gwt.server.SpringGwtRemoteServiceServlet.getBean(SpringGwtRemoteServiceServlet.java:55)  at org.spring4gwt.server.SpringGwtRemoteServiceServlet.processCall(SpringGwtRemoteServiceServlet.java:31)  at com.google.gwt.user.server.rpc.RemoteServiceServlet.processPost(RemoteServiceServlet.java:373)

I think:

1,"500(server error)" tells that gwt has recognized spring service  2,spring service unit test works fine,so spring configuration is right 

The problem may come from spring4gwt,and how to solve this problem?

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