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POHow to get query parameters in ExceptionHandler?
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  1. POHow to get query parameters in ExceptionHandler?
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    copied!<p>In our project (<strong>JBoss 7.0.2</strong>, <strong>JSF 2</strong>), we work on a solution to catch all exceptions during user navigation and redirect them to nice error pages.</p> <p>I used an <code>ExceptionHandler</code>, inspired by a lot of <a href="http://ovaraksin.blogspot.com/2010/10/global-handling-of-all-unchecked.html" rel="nofollow">examples</a> and <a href="http://weblogs.java.net/blog/edburns/archive/2009/09/03/dealing-gracefully-viewexpiredexception-jsf2" rel="nofollow">tutorials</a> online.</p> <p>I managed to do a redirection feature without too much difficulty: in the <code>ExceptionHandler.handle()</code> method, for some exceptions (expired view/session, unauthenticated user asking a denied page, ...) I redirect the user on the login page through a good old</p> <pre><code>FacesContext.getCurrentInstance().getExternalContext().redirect(myRedirectPage); </code></pre> <p>with an additional query parameter containing the original url base64 encoded, and after a successful authentication I use the same redirection mechanism to send the user back to their page.</p> <hr> <p>The problem is with <code>ViewExpiredException</code> on JSF actions, by example when the user click after their view has expired on any button or link with action or actionListener, synchronous or ajax-style, like</p> <pre><code>&lt;h:commandButton action="#{myBean.myAction}" value="do that" /&gt; </code></pre> <p>or</p> <pre><code>&lt;h:commandLink value="do that too"&gt; &lt;f:ajax render=":aZone" execute="@form" listener="#{myBean.myOtherAction}" /&gt; &lt;/h:commandLink&gt; </code></pre> <p><strong>I cannot manage to obtain the query parameters in my <code>ExceptionHandler.handle()</code> method.</strong></p> <p>I tried to put my parameters in a <code>f:metadata</code> section, like</p> <pre><code>&lt;f:metadata&gt; &lt;f:viewParam name="myParam" value="#{myBean.myParam}" /&gt; &lt;/f:metadata&gt; </code></pre> <p>and to include them in the action, so in the method bound to button action I returned</p> <pre><code>"myPage.xhtml?includeViewParams=true" </code></pre> <p>but it changed nothing :-/</p> <p>Am I doing something wrong? Where am I supposed to find the query paremeters? Is it in</p> <pre><code>FacesContext.getCurrentInstance().getExternalContext().getRequest() </code></pre> <p>** UPDATE **</p> <p>As said in comments, view params are no more available after a <code>ViewExpiredException</code> (quite obvious, in fact), so params are to be stored elsewhere (@BalusC quickly suggested in a request scope or through cookie).</p>
 

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