Is JSF Page thread safe

Question

Hi ,
I was wondering if JSF page is thread safe
Okay here is my scenarion.
1. in order to prevent some of the value get re instatiate when the page rendered i declared some of them as static.
However i make some checking if the Page is accessed for the first time , it will set this static object back to Null , if it is a postback it will hold current value which i assign.
The question is ,
1. i have two or three user performing concurrent request will it be a problem ????
2. i notice when i destroy / invalidate the SessionBean. ( user logout scenario ) .
When the user login again , why the static variable still holding the same value . i thought the page should be destroyed?? ( Thats why i check if the page is accessed for the first time , i will set all my object to null ).
Thanks.

Answer 1

The JSP will we translated to a servet by the application server, and therefore will run as a servlet. Servlets are not thread safe, you'll have to elaborate synchronized code blocks to allow one thread in the critical code, wich in turn has it's drawbacks.
Best regards
Antonio.