Spring+Servlet

public class ServletProxy extends GenericServlet
{
    private Servlet proxy;

    public void init() throws ServletException
    {
        String servletName = getServletConfig().getServletName();
        WebApplicationContext wac = WebApplicationContextUtils
                .getRequiredWebApplicationContext(getServletContext());
        this.proxy = (Servlet) wac.getBean(servletName);
    }

    @Override
    public void service(ServletRequest request, ServletResponse response)
            throws ServletException, IOException
    {
        this.proxy.service(request, response);
    }
}

 <servlet>
  <servlet-name>userAction</servlet-name>
  <servlet-class>ServletProxy</servlet-class>
 </servlet>
 <servlet-mapping>
  <servlet-name>userAction</servlet-name>
  <url-pattern>/user</url-pattern>
 </servlet-mapping>

<bean id="userService" class="service.impl.UserServiceImpl"></bean>
<bean id="userAction" class="action.userAction">
	<property name="userService" ref="userService"></property>
</bean>