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From Gabriel Belingueres <>
Subject Re: Problem with jsp and session on first call
Date Fri, 15 Jan 2010 01:03:48 GMT
1. Not normal, but may be it is so because you are not using one of
the recommended ways of accessing the session object. IIRC, the
"#session" object is an object inside the ValueStack, not the *real*
HttpSession. If you talk directly with the real session object, those
sort of things may happen.

2. I think I never had the necessity of using directly the HttpSession
object. In my actions I implement the SessionAware interface, and in
my interceptors I get the session by calling

BTW, I was certain somebody else had a similar problem before. You may
find this post useful too:

2010/1/14 Cimballi <>:
> Hey Grabiel,
> Thanks for the link, now it works, but I two questions :
> 1. About my problem, in the configuration, I am using
> CreateSessionInterceptor to create a session. And in the logs, I can
> see that the first time the JSP is looking for the variable, the
> session exisits but is empty (while I set the value in the action, but
> with HttpSession), the second time, the session contains the value. Do
> you think this behaviour is normal ?
> 2. In which case should we use the "context" session and in which case
> should we use the HttpSession ? For example, in
> CreateSessionInterceptor it uses the HttpSession, but then in the
> actions it seems to be recommended to use the "context" session.
> Thanks !
> Cimballi
> On Thu, Jan 14, 2010 at 5:31 PM, Gabriel Belingueres
> <> wrote:
>> This way of obtaining a Session I think is not a good idiom.
>> May be there are things that happens behind the scene when obtaining a
>> session, that's probably why you are not getting a NPE the first time
>> you call getSession(false) in your code...because "something" already
>> created it.
>> S2 have a Map abstraction of session:
>> HTH
>> 2010/1/14 Cimballi <>:
>>> Hi,
>>> I have a problem with a JSP and the session the first time I call the
>>> action which redirects to the page.
>>> The action sets a variable in the session using the code :
>>> final HttpSession session =
>>>   ServletActionContext.getRequest().getSession(false);
>>> session.setAttribute(name, value);
>>> Then, the action redirects to a page where there is a select tag like :
>>> <s:select name="xxx" list="#session.sessionValue" />
>>> If I start the application, the first time I call the page I have the
>>> following error :
>>> org.apache.jasper.JasperException: tag 'select', field 'list', name
>>> 'xxx': The requested list key '#session.sessionValue' could not be
>>> resolved as a collection/array/map/enumeration/iterator type. Example:
>>> people or people.{name} - [unknown location]
>>> On the second call, it works. Note : I am using a specific
>>> interceptors stack, so the problem could come from there, even if I
>>> doubt.
>>> Do you have any idea about where the problem can come from ?
>>> Thanks,
>>> Cimballi
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