Handling Error Pages Jsf
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Error Pages April 10, 2014 by Amr Mohammed 2 Comments When you run an application in the development project stage
Error Page Jsf
and you encounter an error, you get an error message in an undesirable form. You probably don't want your users to see that message in such that ugly way. To substitute a better error page, use error-page tag in the web.xml file, in primefaces error page that you can specify either a Java Exception or an HTTP error code. So in case the type of thrown exception has matched that type mentioned in the web.xml exception-type  or the error code that generated by the server has matched error-code that mentioned in the web.xml, the JSF framework will handle it by forwarding the user into the desired view that you've defined for such those errors or exceptions. 1. The Deployment Descriptor web.xml This Site Careers Other all primefaces exception handling forums Forum: JSF JSF : redirect errors jsf custom error page to error page Suresh Khant Ranch Hand Posts: 118 posted fullajaxexceptionhandler 5 years ago Hi All , I am trying ( using jsf ) to redirect the errors to http://javabeat.net/jsf-custom-error-pages/ the error page errors.jsp , but the following does not work ( part of web.xml) plans sometimes result in exception/error conditions that we failed to consider. Even worse, there may be errors thrown by any one of the numerous frameworks that we use, which can often be out of http://www.softwareengineeringsolutions.com/thoughts/frameworks/JSF.Techniques-Error.Handling.htm our control. For obvious reasons, filling a user's screen with a Java stack trace http://www.beyondjava.net/blog/jsf-2-0-hides-exceptions-ajax/ is not the optimal solution in these situations. Instead, we'd like to provide the user with a simplified indication of the error condition, and provide some options for recovery. In this article we will look at how error handling may be implemented for applications written using MyFaces/Facelets. 1. The Servlet Specification The Servlet 2.5 specification terms this error page the "error page mechanism", and describes how HTTP error codes or uncaught exception types can be mapped to error handling resources – either static HTML pages, or dynamic resources (JSPs or servlets). This mechanism is very declarative in nature, and is driven by the exceptions. An exception occurs on the server side without getting visible on the client side. The client doesn't show any reaction at all. Often you need a tool like FireBug to become aware there's an error. It took me a while to realize this only happens with AJAX requests, and that this is a well-known behavior in the JSF community. However, there's at least one excellent book (also available at jsfatwork.irian.at) which doesn't mention the problem. So maybe it's worth spending a couple of minutes to write a small article on an old topic. When an AJAX request runs on an error typically an error message is returned to the client. Unfortunately JSF AJAX clients aren't prepared to deal with arbitrary error messages, so they simply ignore them. The standard approach to display errors They can afford to do so because there's a dedicated mechanism to show error messages in the servlet API. With servlets and JSP pages it suffices to register an error page in the web.xml: