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    <p>The particular example does only one useful thing: it saves the view ID as a request attribute so that you can use for example</p> <pre><code>&lt;h:link value="Go back to previous page" outcome="#{currentViewId}" /&gt; </code></pre> <p>But this is not tremendously useful as the raw request URI is already available by the <code>&lt;error-page&gt;</code>'s default request attribute <code>javax.servlet.error.request_uri</code>.</p> <pre><code>&lt;h:outputLink value="#{requestScope['javax.servlet.error.request_uri']}"&gt;Go back to previous page&lt;/h:outputLink&gt; </code></pre> <p>However one thing what a custom <code>ExceptionHandler</code> is really useful for is that it allows you to deal with exceptions during <strong>ajax requests</strong>. By default they have namely no single form of helpful feedback in the client side. Only in Mojarra with project stage set to "Development" you'll see a bare JavaScript alert message with the exception message. But that's it. There is no single form of feedback in "Production" stage. With a custom <code>ExceptionHandler</code> you would be able to parse the <code>web.xml</code> to find the error page locations, create a new <code>UIViewRoot</code> with it and force JSF to set ajax rendering to <code>@all</code>. </p> <p>So, <em>basically</em>:</p> <pre><code>String errorPageLocation = "/WEB-INF/errorpages/500.xhtml"; context.setViewRoot(context.getApplication().getViewHandler().createView(context, errorPageLocation)); context.getPartialViewContext().setRenderAll(true); context.renderResponse(); </code></pre> <p>See also this related question: <a href="https://stackoverflow.com/questions/10449862/what-is-the-correct-way-to-deal-with-jsf-2-0-exceptions-for-ajaxified-components">What is the correct way to deal with JSF 2.0 exceptions for AJAXified components?</a> and this blog: <a href="http://balusc.blogspot.com/2012/03/full-ajax-exception-handler.html" rel="nofollow noreferrer">Full Ajax Exception Handler</a>.</p>
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A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.

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