? with invalid session

[Eric Lemle <er...@ihc.com>]

If the session expires and then they click on something it runs the
action and then the action tries to get some info from the session
which causes a null pointer exception.  Is there anyway to have a
pre-filter rather than a post-filter to send them to the page that
says,
says ex.-> 'your session has expired, please login again'

-Eric

Eric D. Lemle
Senior Programmer / Analyst
Intermountain Health Care
36 South State Street, Suite 1100
Salt Lake City, Utah 84111 
United States of America (USA)
(801) 442-3688 -- e-mail: Eric.Lemle@IHC.com


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Menu

[Marcelo Epstein <ma...@epstein.com.br>]

Hi,
I am developing a software for a company using struts. What is the best 
way to create the menus to navigate in the system?
JSF? Simple HTML with javascript? Tag libraries?

Thanks in advance,
Marcelo Epstein

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Re: ? with invalid session

[Rick Reumann <st...@reumann.net>]

Eric Lemle wrote the following on 2/16/2005 4:22 PM:
> If the session expires and then they click on something it runs the
> action and then the action tries to get some info from the session
> which causes a null pointer exception.  Is there anyway to have a
> pre-filter rather than a post-filter to send them to the page that
> says,
> says ex.-> 'your session has expired, please login again'

Sure just set up a servlet filter that looks for a valid session and if 
there isn't one you forward them to that page. Define your filter in 
your web.xml. I think the tomcat docs show an example... but for my app 
I have something like...

<filter>
     <filter-name>NdaFilter</filter-name>
     <filter-class>com.nielsenmedia.nda.ui.filter.NdaFilter</filter-class>
   </filter>
   <filter-mapping>
     <filter-name>NdaFilter</filter-name>
     <url-pattern>*.do</url-pattern>
   </filter-mapping>
   <filter-mapping>
     <filter-name>NdaFilter</filter-name>
     <url-pattern>*.jsp</url-pattern>
   </filter-mapping>

In your custom Filter class which extends javax.servlet.Filter, you'll 
have a doFilter method in it where you'd add something like...

HttpServletRequest request = (HttpServletRequest)req;
HttpServletResponse response = (HttpServletResponse)res;
String contextPath = request.getContextPath();

HttpSession session = request.getSession(false);
if (session == null) {
    log.debug("The session no longer exists");
    response.sendRedirect(contextPath+"/sessionTimeOut.jsp");
    return;
} else {
  filterChain.doFilter(req, res);
}

(Could be much better ways to accomplish the above, but the above should 
work)

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