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Posted to users@tomcat.apache.org by Jason Novotny <JD...@lbl.gov> on 2001/04/18 23:19:07 UTC
getSession(false)
Hi,
I'm using the following snippet in my main servlet:
public void service(HttpServletRequest req, HttpServletResponse res)
throws ServletException, IOException {
HttpSession session = req.getSession(false);
if (session == null) {
System.out.println("session is null");
} else {
System.out.println("session is not null");
}
}
what I find is that when I go to the servlet, I first see "session is
null". Fine by me, and since I passed "false" to getSession, I expect
not to have one created. However, when I reload the page, now I get
"session is not null". can anyone please explain why getSession(false)
actually creates a session, or what I might be doing wrong.
Thanks, Jason
--
Jason Novotny novotny@george.lbl.gov
Home: (510) 549-0574 Work: (510) 486-8662
NERSC Distributed Computing http://www-didc.lbl.gov
Re: getSession(false)
Posted by Bo Wang <bo...@home.com>.
I've got a different problem.
I have a method called getHttpSession(request, response), as below:
HttpSession getHttpSession(HttpRequest request, HttpResponse response)
{
HttpSession session = req.getSession(false);
if ( session==null)
{
System.out.println("session = null";
}
else
{
.....................
}
return session;
}
which returns an HttpSesion, this method is in BaseServlet, then I create a
new servelt called Login which extend from BaseServlet, this method was
invoked in Login servlet.
When I run the Login servlet, in IE, sometimes I get session=null, and I
also get some error message said "the instruction in address xxxxxxxxxx is
not correct", or something like that, sometimes I can get correct session,
but in Netscape, I never get session=null.
Did you try your servlet both on IE and Netscape? If so, do they come with
different result?
Becky
----- Original Message -----
From: "Jason Novotny" <JD...@lbl.gov>
To: "Stuart Thomson" <st...@swtsoft.demon.co.uk>
Cc: <to...@jakarta.apache.org>
Sent: Thursday, April 26, 2001 1:51 PM
Subject: Re: getSession(false)
>
> No- but my lame workaround is to stick something in the session and
> test to see if it's null in which case I explicitly set session to null.
>
> e.g.
>
> HttpSession session = req.getSession(false);
>
> // Unless a user profile exists, the session is null
> if (session != null) {
> Object user = session.getAttribute("user");
> if (user == null)
> session = null;
> }
>
>
> Jason
>
> Stuart Thomson wrote:
>
> > Did you ever find out what was causing this? I seem to be hitting the
> > same problem.
> >
> > Jason Novotny wrote:
> > >
> > > Hi,
> > >
> > > I'm using the following snippet in my main servlet:
> > >
> > > public void service(HttpServletRequest req, HttpServletResponse res)
> > > throws ServletException, IOException {
> > >
> > > HttpSession session = req.getSession(false);
> > > if (session == null) {
> > > System.out.println("session is null");
> > > } else {
> > > System.out.println("session is not null");
> > > }
> > >
> > > }
> > >
> > > what I find is that when I go to the servlet, I first see "session is
> > > null". Fine by me, and since I passed "false" to getSession, I expect
> > > not to have one created. However, when I reload the page, now I get
> > > "session is not null". can anyone please explain why getSession(false)
> > > actually creates a session, or what I might be doing wrong.
> > >
> > > Thanks, Jason
> > >
> > > --
> > > Jason Novotny novotny@george.lbl.gov
> > > Home: (510) 549-0574 Work: (510) 486-8662
> > > NERSC Distributed Computing http://www-didc.lbl.gov
>
> --
> Jason Novotny novotny@george.lbl.gov
> Home: (510) 610-8360 Work: (510) 486-8662
> NERSC Distributed Computing http://www-didc.lbl.gov
>
>
>
>
Re: setAttribute/getAttribute problem
Posted by Aaron Lindsey <aa...@redneptune.com>.
In response to Bill Kaufman's suggestion here is the output from his code
snippet:
Request object: class=class PopBean, loader=AdaptiveClassLoader( )
PopBean object: class=class PopBean, loader=AdaptiveClassLoader( )
Myself: class=class sla._0002fsla_0002ftest_0002ejsptest_jsp_9,
loader=JspLoader( /usr/local/tomcat/work/localhost_8080 ) /
AdaptiveClassLoader( )
Also, I'm trying to remember everyone's questions. I am using forward and
not sendRedirect. I tried using the session to pass this rather than the
request with the same results. I do have the correct import statement
because I can instantiate PopBean objects in the jsp just fine.
Hmmm. Just when I think I know everything...
Aaron
Re: getSession(false)
Posted by Jason Novotny <JD...@lbl.gov>.
No- but my lame workaround is to stick something in the session and
test to see if it's null in which case I explicitly set session to null.
e.g.
HttpSession session = req.getSession(false);
// Unless a user profile exists, the session is null
if (session != null) {
Object user = session.getAttribute("user");
if (user == null)
session = null;
}
Jason
Stuart Thomson wrote:
> Did you ever find out what was causing this? I seem to be hitting the
> same problem.
>
> Jason Novotny wrote:
> >
> > Hi,
> >
> > I'm using the following snippet in my main servlet:
> >
> > public void service(HttpServletRequest req, HttpServletResponse res)
> > throws ServletException, IOException {
> >
> > HttpSession session = req.getSession(false);
> > if (session == null) {
> > System.out.println("session is null");
> > } else {
> > System.out.println("session is not null");
> > }
> >
> > }
> >
> > what I find is that when I go to the servlet, I first see "session is
> > null". Fine by me, and since I passed "false" to getSession, I expect
> > not to have one created. However, when I reload the page, now I get
> > "session is not null". can anyone please explain why getSession(false)
> > actually creates a session, or what I might be doing wrong.
> >
> > Thanks, Jason
> >
> > --
> > Jason Novotny novotny@george.lbl.gov
> > Home: (510) 549-0574 Work: (510) 486-8662
> > NERSC Distributed Computing http://www-didc.lbl.gov
--
Jason Novotny novotny@george.lbl.gov
Home: (510) 610-8360 Work: (510) 486-8662
NERSC Distributed Computing http://www-didc.lbl.gov
Re: getSession(false)
Posted by Stuart Thomson <st...@swtsoft.demon.co.uk>.
Did you ever find out what was causing this? I seem to be hitting the
same problem.
Jason Novotny wrote:
>
> Hi,
>
> I'm using the following snippet in my main servlet:
>
> public void service(HttpServletRequest req, HttpServletResponse res)
> throws ServletException, IOException {
>
> HttpSession session = req.getSession(false);
> if (session == null) {
> System.out.println("session is null");
> } else {
> System.out.println("session is not null");
> }
>
> }
>
> what I find is that when I go to the servlet, I first see "session is
> null". Fine by me, and since I passed "false" to getSession, I expect
> not to have one created. However, when I reload the page, now I get
> "session is not null". can anyone please explain why getSession(false)
> actually creates a session, or what I might be doing wrong.
>
> Thanks, Jason
>
> --
> Jason Novotny novotny@george.lbl.gov
> Home: (510) 549-0574 Work: (510) 486-8662
> NERSC Distributed Computing http://www-didc.lbl.gov