The issue now boils down to the following a bit strange thing. Any idea why
this happens ?
- request.getSession() returns an incorrect null on Linux, but on Windows
it's OK - under the following circumstances:
When using Firebug on Firefox I noted that a corporate common .css
references a 1-pixel gif which is not present and visible, hence there is a
'404 Not found' error for the 'GET
localhost:8080/webdav/images/.../1px.gif'. But the preceding 'GET
localhost:8080/wap-app/start.action' is fine.
In my myValve-class on Linux:
'GET localhost:8080/wap-app/start.action' => myValve.invoke() ...
request.getSession() returns a correct session object
'GET localhost:8080/webdav/images/.../1px.gif' => myValve.invoke() ...
request.getSession() and request.getSession(true) both returns null
Same code and same build, in my myValve-class on Windows:
Both GET => myValve.invoke() ... request.getSession() returns a correct
session object
The webapp is built with Struts2/Spring.
Both Linux and Windows uses Tomcat 6.0.20.
On Windows Java version 1.6.0_16 is used
On RedHat Linux Java version 1.6.0_13 is used
and..
>> In the "log incorrect event" code, do you return
>> from the valve, or do you continue processing?
The execution continues down to the bottom with 'getNext().invoke(req,resp)'
Johan
2009/12/17 Christopher Schultz <ch...@christopherschultz.net>
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>
> Johan,
>
> On 12/17/2009 7:52 AM, Johan Thorselius wrote:
> > request.getSession() returns an incorrect null on Linux, but on Windows
> it's
> > OK.
>
> That's odd... request.getSession() should never return null. This method:
>
> "
> Returns the current session associated with this request, or if the
> request does not have a session, creates one.
> "
>
> > I have an ordinary Struts2 web app deployed on Tomcat 6.0.20, together
> with
> > a JAAS-solution where I have my own Valve class.
> >
> > The Valve repeatedly executes invoke() with the following code-snippet
> (here
> > very much simplified):
> > .
> > .
> > .
> > if (LOGGER.isDebugEnabled()) {
> > if (request.getSession() == null) {
> > // Log incorrect event (1)
> > } else {
> > // Log OK (2)
> > }
> > if (request.getSession(true) == null) {
> > // Log incorrect event (3)
> > } else {
> > // Log OK (4)
> > }
> > }
> >
> > /*
> > * Here a NullPointerException occurs
> > */
> > request.getSession().setAttribute("...",...);
>
> In the "log incorrect event" code, do you return from the valve, or do
> you continue processing?
>
> > In the first request the session is not lost, everything is fine with (2)
> > and (4). In the following requests getSession() returns null (1) and (3).
>
> Are you storing the request object anywhere and perhaps using it after
> it's been recycled?
>
> - -chris
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