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POCreating session explicitly in requestScoped bean in JSF 2
 

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    <p>I have a doubt here about creating session in requestScoped bean in JSF 2.x. I understand that we need not create session in JSF 2.x since we can directly use a sessionScoped bean to put the user required data. But I recently was introduced to a JSF code where the developer had created instance variable of session and get session from facescontext, like below</p> <pre><code> @ManagedBean @RequestScoped Public class someClass(){ FacesContext facesContext = FacesContext.getCurrentInstance(); HttpSession session = (HttpSession) facesContext.getExternalContext().getSession(true); public void someFunction(){ //Some code here.. session.setAttribute("key","value"); //Some code here.. } //rest of the code here... } </code></pre> <p>Well, I told them that one should not have "session" as a instance variable and also there is no need to get a session explicitly in JSF 2 and rather use a sessionScoped bean.</p> <p>For the first I gave a reason as "keeping session as instance variable is not thread safe" and for the second statement I gave as "you are doing a workaround for JSF session which is already provided".</p> <p>The counter-argument what I got was, For first reason "Ours is web application so there is no question of multi-threading". For second I got "Anyway the session variable will be cleared once the request is processed, so there is nothing <strong>wrong</strong> here.</p> <p>I had a no other strong points to rectify it.So my question is, 1) were they correct? 2) is there any other specific reason why we should be doing in a way it ought to be done? 3) And finally, anything which might have prompted them to use that way?</p> <p>can anybody please elaborate? Please correct me. Thanks</p>
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    1. COA webapp is multithreaded to handle requests concurrently. Requests can have the same session id. Have a look at [Is HttpSession thread safe](http://stackoverflow.com/questions/616601/is-httpsession-thread-safe-are-set-get-attribute-thread-safe-operations).
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    2. CO@NicolasLabrot Yea, It can have same session id when requested from two different browsers in the same machine and hence it should be handled in a multi-threaded way. Apart from this case, if we talk about ideal case of request coming from different machines then multi-threaded doesn't come into picture right? The question is related to this case.
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    3. CO@marceln Why this question has an ejb tag??
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