How to make spring4gwt export more than 1 service ?

Question

I successfully follow GWT and spring4gwt's tutorials and transform the StockWatcher's demo into a Spring(3.0) enabled service , by the following configurations :

web.xml :

  <servlet-mapping>
    <servlet-name>springGwtRemoteServiceServlet</servlet-name>
    <!-- stockWatcher module is rename-to="stock" -->
    <url-pattern>/stock/spring/*</url-pattern> 
  </servlet-mapping>

StockPriceService.java :

@RemoteServiceRelativePath("spring/stockPriceService")
public interface StockPriceService extends RemoteService
{
  StockPrice[] getPrices(String[] symbols) throws DelistedException;
}

spring's app.xml :

<bean id="stockPriceService" class="destiny.gwt.stock.server.StockPriceServiceImpl"/>

Then , I want to add another Service : Chatroom.gwt.xml (rename-to="chatroom") , and hope the two services can be combined in one webapp and served by one spring4gwt instance .

This is my ChatService.java :

@RemoteServiceRelativePath("spring/chatService")
public interface ChatService extends RemoteService
{
  public boolean login(String username , String password);
}

spring's app.xml :

  <bean id="chatService"       class="destiny.gwt.chatroom.server.ChatServiceImpl"/>
  <bean id="stockPriceService" class="destiny.gwt.stock.server.StockPriceServiceImpl"/>

As to web.xml :

  <servlet-mapping>
    <servlet-name>springGwtRemoteServiceServlet</servlet-name>
    <url-pattern>/stock/spring/*</url-pattern>
  </servlet-mapping>

Here comes the problem ! I don't know how to write a correct url-pattern to let springGwtRemoteServiceServlet able to simulantously listen to /stock/spring/* and /chatroom/spring/* ?

The StockWatcher module is rename-to="stock" , so each POST request will be post to URI "/stock/..." . And Chatroom module is rename-to="chatroom" , and each POST will be post to URI "/chatroom/..." . I tried to write /*/spring/* , but in vain , both not work...