In a valve Request.getSession() can return null.
See how it is implemented.
(org.apache.catalina.connector.Request) -> getSession(), doGetSession(boolean)
I do not know, why it happens in your circumstances.
2009/12/23 Johan Thorselius <johan.thorsel...@gmail.com>:
> Hi Ron,
>
> Actually, there is an Apache in front of Tomcat when on Linux (sorry about
> that vital detail), can that create the problem ?
>
> I will check the configuration of Apache with other staff, can't be before
> x-mas.
>
> Thanks - Johan
>
>
> 2009/12/23 Ron McNulty <rmcnu...@xtra.co.nz>
>
>> Hi Johan
>>
>> Two JSESSIONID values does look odd. I've seen problems like this when
>> another server running a Java J2EE servlet container incorrectly had its
>> JSESSIONID cookie scope set to the whole domain, rather than scoped to the
>> server and application. In my case it was a SAP web server, and the session
>> ID value was readily recognisable, and quite different to Tomcat values.
>>
>> That may also explain the Linux/Windows difference if your development
>> boxes are on Windows and the production/test boxes are on Linux.
>>
>> Regards
>>
>> Ron
>>
>> ----- Original Message ----- From: "Johan Thorselius" <
>> johan.thorsel...@gmail.com>
>> To: "Tomcat Users List" <users@tomcat.apache.org>
>> Sent: Tuesday, December 22, 2009 11:38 PM
>> Subject: Re: Http session lost b/w struts actions on Linux but not in Win
>>
>>
>>
>> I here add some info from Firebug which may be significant.
>>>
>>> 'GET localhost:8080/wap-app/start.action':
>>>
>>> CookieJSESSIONID=9726CDF4A527E3D98451140AB69EFA2C;
>>> JSESSIONID=BEED739340DDD4370C85A9D12917692A
>>>
>>> 'GET localhost:8080/webdav/images/.../1px.gif':
>>>
>>> Cookie JSESSIONID=BEED739340DDD4370C85A9D12917692A
>>>
>>> Johan
>>>
>>>
>>>
>>> 2009/12/22 Johan Thorselius <johan.thorsel...@gmail.com>
>>>
>>> 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>
>>>>
>>>> -----BEGIN PGP SIGNED MESSAGE-----
>>>>
>>>>> Hash: SHA1
>>>>>
>>>>> 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
>>>>> -----BEGIN PGP SIGNATURE-----
>>>>> Version: GnuPG v1.4.10 (MingW32)
>>>>> Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org/
>>>>>
>>>>> iEYEARECAAYFAksqoSoACgkQ9CaO5/Lv0PDZ7QCfXwdUPAoU9EPxlEC64f11rlAa
>>>>> +0oAoJG3hjVFYbeCvkrXQ14bkvlq9bJZ
>>>>> =lF2t
>>>>> -----END PGP SIGNATURE-----
>>>>>
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>>>>>
>>>>
>>>
>>
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