On Wed, Aug 14, 2013 at 12:26 AM, Nelson Paz y Miño <[email protected]>wrote:
> In the second servlet I try to get the info from the session like this:
>
> String user_owner_id =
> req.getSession().getAttribute("FBUserID").toString();
> String fbcurrency = req.getSession().getAttribute("FBCurrID").toString();
>
> I'm able to get the first value, but not the second one. The browser is
> getting 500 Server Error:
>
> The error I got in the App Engine Console Log is:
>
> Uncaught exception from servlet java.lang.NullPointerException at
> guestbook.FBFriendCall.doGet(FBFriendCall.java:27)
>
>
How are you using Sessions? Are you using App Engine's built-in sessions
ability, or another framework? If you are using GAE's built-in sessions, do
you have async-session-persistence turned on (
https://developers.google.com/appengine/docs/java/config/appconfig#Java_appengine_web_xml_Enabling_sessions
),
and if so, how much time elapses between a user visiting the first servlet
and then the second servlet?
Try calling getAttributeNames() on the session object, see what else is
stored. The attribute name might be getting changed by a filter or another
servlet.
-----------------
-Vinny P
Technology & Media Advisor
Chicago, IL
App Engine Code Samples: http://www.learntogoogleit.com
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