Hi, all,
In my application, a session attribute is needed to
let the application function properly. So, I have a
filter to verify whether this attribute is set or not
in the session.
The doFilter method of the filter is something like
the following:
public void doFilter(ServletRequest request,
ServletResponse response,
FilterChain chain) throws IOException,
ServletException {
HttpServletRequest hreq = (HttpServletRequest)
request;
logger.debug("Enter: " + hreq.getRequestURL());
if (request instanceof HttpServletRequest) {
logger.debug("instanceof");
HttpSession session = hreq.getSession(false);
// Check the session setting
if (session != null) {
logger.debug("session");
if (session.getAttribute("myAttr") != null) {
logger.debug("Attr set");
// jump to the resource if it is set
chain.doFilter(request, response);
return;
}
}
}
// ....
filterConfig.getServletContext().getRequestDispatcher(
"/" +
the_page).forward(request, response);
return;
}
}
After having an additonal segment of the application
up, I find the the getSession(false) returns null for
the requests of the first segment of application. When
I click the first segment of the application, I am
forwarded to the "the_page", while I reach the right
page on the second segment. There is not any
architecture difference between these two segments.
I use the Spring framework by the way. I don't think
the framework has anything to do with the session
management.
What is the cause?
Thanks very much for all your inputs in advance.
Vernon
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