1. Don't use IE.  It's a deprecated browser, and GWT no longer supports 
it.  However, that's unlikely to be your problem.

2. It's still not clear what you're doing.  I suspect you are running the 
servers independently with different URLs, and not active-active behind a 
router.

3. Depending on your Web Server, you usually should see your session id in 
a cookie, not in a post message.  I'm actually not sure how Chrome shows 
you the cookie transmission in the dev tools, I don't think it does.


On Saturday, 1 October 2022 at 12:23:04 am UTC+10 [email protected] 
wrote:

> Thanks for your responses.
> I still didn't find a solution. We have reinstalled tomcat but nothing's 
> changed.
> @Jens I debbuged in DevTools and found that for the server A, there is a 
> Post request containing a sessionId sent to it and intercepted by the 
> service containing both methods. The same request is sent to the server B 
> but doesn't contain a sessionId. I still didn't understand why. The same 
> app is deployed and by the way we can only are using IE to access web pages.
> So The sessionId is sent from both servers to the front. But only sent 
> back to server A.
>
> @Craig both servers are working and active.I have no idea about session 
> replication, how do I check that?
>
> This is for sure related to the server, it must be some config or maybe a 
> security config? 
> Le vendredi 30 septembre 2022 à 03:50:53 UTC+2, [email protected] 
> a écrit :
>
>> Your question lacks some details.  You talk about two servers, but don't 
>> tell us if they are active-active, or just running one server at a time.
>>
>> If they are active-active, we'd need to know how you are doing your 
>> session replication between then servers.
>>
>> If you are only running one server at a time, then Jens reply is a good 
>> idea.
>>
>> I personally prefer to handle sessions myself, with a cookie and a 
>> memcache (yes, not really sessions at all), so I can easily scale.  But 
>> that's just a little side note.  :)
>>
>> Either way, this outside of GWT's responsibilities, but still happy to 
>> help.
>>
>> On Thursday, 29 September 2022 at 6:24:33 pm UTC+10 Jens wrote:
>>
>>> Use your browser dev tools to inspect the network request. You should 
>>> check if server B sends back a session id cookie and that this session id 
>>> cookie is transmitted back to the server for the second method that does 
>>> getSession(false). If it doesn't or the session is already invalidated 
>>> (either through code or through session timeout configuration on server B) 
>>> then getSession(false) will return null.
>>>
>>> -- J.
>>>
>>> [email protected] schrieb am Mittwoch, 28. September 2022 um 
>>> 12:21:36 UTC+2:
>>>
>>>> I have a gwt app that is running when deployed on tomcat on server A
>>>> For some reason the same app when is deployed on tomcat on a server B 
>>>> has a session issue
>>>>
>>>> We have Method 1 and Method 2 inside a servlet that extends 
>>>> RemoteServiceServlet
>>>>
>>>> We have a method1 in which we do:
>>>> this.getThreadLocalRequest.getSession(true).setAttribute("myuserid", 
>>>> myuserid)
>>>>
>>>> Then in a second method we do
>>>> this.getThreadLocalRequest.getSession(false).getAttribute("myuserid")
>>>> which throws a null pointer exception as getSession retuns null
>>>>
>>>> It is strange as this only happens on the server B
>>>> I have verified the tomcat config files like context.xml files and they 
>>>> are identical
>>>>
>>>> I have printed currentThread.gtId() inside both methods and they are 
>>>> different but as said no issue on server A.
>>>>
>>>>
>>>>
>>>>
>>>>
>>>>

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