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POSession attribute returns null when returning from view
 

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    <p>I'm currently trying to save search criteria attributes to the session between two pages: search page and edit page. The goal is to save the three variables: sYear, submission, collectionPeriod. I'm adding these to the session here below in the Search screen controller:</p> <p><code>request.getSession().setAttribute("sYearSave", sYear); request.getSession().setAttribute("submissionSave", submission); request.getSession().setAttribute("collectionPeriodSave", collectionPeriod);</code></p> <p>In the edit screen controller, I set a Boolean<code>isFromEditScreen</code> to <code>true.</code> This is so I know that I'm coming from the edit screen. I do print out the variables and I do get the values correctly here in the edit controller screen.</p> <pre><code>request.getSession().setAttribute("isFromEditScreen", new Boolean(true)); sYearSave = (String)request.getSession().getAttribute("sYearSave"); collectionPeriodSave = (String)request.getSession().getAttribute("collectionPeriodSave"); submissionSave = (String)request.getSession().getAttribute("submissionSave"); </code></pre> <p>But the problem is when I use a back button to go back to the Search screen, the search criteria <code>sYearSave, collectionPeriodSave, and submissionSave</code> values return <code>NULL.</code> For some reason, the <code>isFromEditScreen</code> boolean works just fine and returns <code>true.</code> It actually enters the statement but the search criteria return <code>null.</code> The Search controller code is below:</p> <pre><code>if (isFromEditScreen != null &amp;&amp; isFromEditScreen == true) { System.out.println("Inside isFromEditScreen ==== true"); sYear = (String)request.getSession().getAttribute("sYearSave"); collectionPeriod = (String)request.getSession().getAttribute("collectionPeriodSave"); submission = (String)request.getSession().getAttribute("submissionSave"); sYearSave = (String)request.getSession().getAttribute("sYearSave"); collectionPeriodSave = (String)request.getSession().getAttribute("collectionPeriodSave"); submissionSave = (String)request.getSession().getAttribute("submissionSave"); System.out.println("sYearSave ==== " + sYearSave); System.out.println("submissionSave ==== " + submissionSave); System.out.println("collectionPeriodSave ==== " + collectionPeriodSave); System.out.println("isFromEditScreen set in else ==== " + isFromEditScreen); } </code></pre> <p>Any help would be greatly appreciated!</p>
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    1. USRichard
    1. USRichard
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      1. VTDownMod
    1. COWhen you use the browser's back button, it doesn't generate a request to the server. Browsers usually loads the page from cache, did you try this wia a LinkButton or something like this?
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      1. USrusty
    2. COAnd you're sure the values you put into the session are not `null`? Because, if you go back to the search screen and reload the page with a "blank" URL - i.e. there are no parameters given - you may end up overriding the values of the session, depending on your implementation of the Search controller. Aside from that - did you think about tabbed browsing? One session, two tabs, many problems...
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      1. USskirsch
    3. COYou should avoid passing search parameters from `session`. You should use [query strings](http://stackoverflow.com/questions/4128436/query-string-manipulation-in-java) for search parameters.
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      1. USApurv
 

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