Spring - context scan fail with requestfactory (gwt) - spring

Question

in a gwt web application i use spring.
if i use in my applicationContext.xml file
<context:component-scan base-package="com.test.**"/>
my bean is not found, i need to manually declare it in the applicationContext file.
my web.xml file
<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>
<servlet>
<servlet-name>gwtRequest</servlet-name>
<servlet-class>com.google.web.bindery.requestfactory.server.RequestFactoryServlet</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>gwtRequest</servlet-name>
<url-pattern>/gwtRequest</url-pattern>
</servlet-mapping>
<welcome-file-list>
<welcome-file>welcomeGWT.html</welcome-file>
</welcome-file-list>
Is there any reason why component scan fail?
Locator class
public class AccountLocator extends Locator<Account, Long> {
#Autowired
private AccountDAO accountDAO;
...
}
Spring service locator
public class SpringServiceLocator implements ServiceLocator {
#Override
public Object getInstance(Class<?> clazz) {
HttpServletRequest request = RequestFactoryServlet.getThreadLocalRequest();
ServletContext servletContext = request.getSession().getServletContext();
ApplicationContext context = WebApplicationContextUtils.getWebApplicationContext(servletContext);
return context.getBean(clazz);
}
}
Server layer
#Service
public class AccountServiceImpl implements AccountService{
#Autowired
private AccountDAO accountDAO;
...
}
Dao layer
#Repository
public class AccountDAOImpl implements AccountDAO{
...
}