Each Time The Server Restarts, The Browser Does Not Display The Welcome Page

[JiaPei Jen]

While the server is running, I am able to be redirected to the welcome page after I click on any of the LOGOUT buttons in my application. And while I am
at the welcome page, I can see
http://localhost:8080/NameOfMyApplication/do/Main
in the address bar.
But, if I shut down the server and restart it, the browser shows a page with all the images that I defined in the tile (I use tile to show web pages) and a LOGOUT button. In the address bar, I see
http://localhost:8080/NameOfMyApplication/do/Main;jsessionid=49I943J0FJQIQ205058
I must click on that LOGOUT button in order to go to my welcome page. That is to say, I do not directly get the welcome page each time the server restarts.
I must have messed something up and would appreciate if anybody could help identifying the problem.
In my web.xml, I have:

<welcome-file-list>
<welcome-file>index.jsp</welcome-file>
</welcome-file-list>

and this index.jsp (shown below) is in my application
root:

<%@ taglib uri="/tags/struts-logic" prefix="logic" %>
<logic:redirect forward="welcome"/>

The mapping in the struts-config.xml is:

<forward
    name="welcome"
    path="/do/Main"/>

I think the logout part would be more informative.
The LOGOUT button is in a piece of tile:

<%@ taglib uri="/tags/struts-html" prefix="html" %>
<html:img page="/article/common/images/goldbrush.gif"
border="0" alt="[goldbrush]"/>
<html:link forward="exit">LOGOUT</html:link> 

The mapping in the struts-config.xml is:

<forward
    name="exit"
    path="/do/Logoff"/>

and

<action 
    path="/Logoff"
    type="org.apache.artimus.signoff.LogoffAction">
  <forward
      name="success"
      redirect="true"
      path="/index.jsp"/>
</action>

The code in the LogoffAction.java is shown below:

// package and import statements are omitted
public final class LogoffAction extends Action 
{
   public ActionForward execute(ActionMapping mapping,
                                ActionForm form,
                                HttpServletRequest request,
                                HttpServletResponse response)
                                throws IOException, ServletException
   {
      response.setContentType( "text/html" );
      PrintWriter out = response.getWriter();
      // Extract attributes we will need
      HttpSession session = request.getSession( false );
      if (session != null) 
      {
         session.invalidate();
      }
      return (mapping.findForward( "success" ));
   }
} // end LogoffAction 

[JiaPei Jen]

Could anybody give a hand?