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Error Handling In Jsf Components

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Exception Handling In Jsf

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Jsf Exception Handling Example

Core 2.0 and later versions Since JSF 2.0, it is possible to provide a custom javax.faces.context.ExceptionHandler or javax.faces.context.ExceptionHandlerWrapper implementation to deal with exceptions. To do that, just create your custom class, an factory that wrap/override it and add the following into your faces-config.xml: faces-config.xml jsf components not rendering org.apache.myfaces.context.ExceptionHandlerFactoryImpl This is an example of an ExceptionHandlerFactory, from myfaces code: ExceptionHandlerFactoryImpl.java public class ExceptionHandlerFactoryImpl extends ExceptionHandlerFactory { @Override public ExceptionHandler getExceptionHandler() { return new SwitchAjaxExceptionHandlerWrapperImpl( new MyFacesExceptionHandlerWrapperImpl(new ExceptionHandlerImpl()) , new AjaxExceptionHandlerImpl()); } } If you need a wrapper: ExceptionHandlerFactoryImpl.java public class ExceptionHandlerFactoryImpl extends ExceptionHandlerFactory { @Override public ExceptionHandler getExceptionHandler() { return new CustomExceptionHandlerWrapper(getWrapped().getExceptionHandler()); } } The most important method to override is ExceptionHandler.handle(). MyFacesExceptionHandlerWrapperImpl.java public class MyFacesExceptionHandlerWrapperImpl extends ExceptionHandlerWrapper { //... public void handle() throws FacesException { //... some custom code goes here ... } } Take a look at MyFaces Core source code, to know in detail how ExceptionHandler implementations works. MyFaces ExceptionHandler MyFaces Core provide a custom ExceptionHandler to deal with exceptions and provide detailed information about it. Since 2.0.8/2.1.2 this is disabled on Production environments unless it enabl

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Jsf Exception Handler

Meta Discuss the workings and policies of this site About Us Learn more about jsf catch exception Stack Overflow the company Business Learn more about hiring developers or posting ads with us Stack Overflow Questions Jobs Documentation Tags Users Badges https://myfaces.apache.org/wiki/core/user-guide/jsf-and-myfaces-howtos/managing-errors---infos---warnings/handling-server-errors.html Ask Question x Dismiss Join the Stack Overflow Community Stack Overflow is a community of 4.7 million programmers, just like you, helping each other. Join them; it only takes a minute: Sign up Why use a JSF ExceptionHandlerFactory instead of redirection? up vote 18 down vote http://stackoverflow.com/questions/10534187/why-use-a-jsf-exceptionhandlerfactory-instead-of-error-page-redirection favorite 15 All of the ExceptionHandlerFactory examples I have come across so far redirect a user to a viewExpired.jsf page in the event that a ViewExpiredException is caught: public class ViewExpiredExceptionExceptionHandler extends ExceptionHandlerWrapper { private ExceptionHandler wrapped; public ViewExpiredExceptionExceptionHandler(ExceptionHandler wrapped) { this.wrapped = wrapped; } @Override public ExceptionHandler getWrapped() { return this.wrapped; } @Override public void handle() throws FacesException { for (Iterator i = getUnhandledExceptionQueuedEvents().iterator(); i.hasNext();) { ExceptionQueuedEvent event = i.next(); ExceptionQueuedEventContext context = (ExceptionQueuedEventContext) event.getSource(); Throwable t = context.getException(); if (t instanceof ViewExpiredException) { ViewExpiredException vee = (ViewExpiredException) t; FacesContext facesContext = FacesContext.getCurrentInstance(); Map requestMap = facesContext.getExternalContext().getRequestMap(); NavigationHandler navigationHandler = facesContext.getApplication().getNavigationHandler(); try { // Push some useful stuff to the request scope for use in the page requestMap.put("currentViewId", vee.getViewId()); navigationHandler.handleNavigation(facesContext, null, "/viewExpired"); facesContext.renderResponse(); } finally { i.remove(); } } } // At this point, the qu

April 5, 2012April 6, 2012 470 Words Adding global exception handling using JSF 2.x ExceptionHandler This a great feature https://wmarkito.wordpress.com/2012/04/05/adding-global-exception-handling-using-jsf-2-x-exceptionhandler/ of JSF 2.x: A generic API to manipulate application exception in a global manner. In order to implement this you must implement (extend) two different classes: ExceptionHandlerWrapper - Provides http://javabeat.net/jsf-custom-error-pages/ a simple implementation of ExceptionHandler that can be subclassed by developers wishing to provide specialized behavior to an existing ExceptionHandler instance. The default implementation of all methods jsf components is to call through to the wrapped ExceptionHandler instance. ExceptionHandlerFactory - A factory object that creates (if needed) and returns a new ExceptionHandler instance. On Duke's Forest this is the implementation: CustomExceptionHandlerFactory.java: package com.forest.exception; public class CustomExceptionHandlerFactory extends ExceptionHandlerFactory { private ExceptionHandlerFactory parent; // this injection handles jsf public CustomExceptionHandlerFactory(ExceptionHandlerFactory parent) { this.parent = handling in jsf parent; } @Override public ExceptionHandler getExceptionHandler() { ExceptionHandler handler = new CustomExceptionHandler(parent.getExceptionHandler()); return handler; } } CustomExceptionHandlerFactory.java: package com.forest.exception; public class CustomExceptionHandler extends ExceptionHandlerWrapper { private static final Logger log = Logger.getLogger(CustomExceptionHandler.class.getCanonicalName()); private ExceptionHandler wrapped; CustomExceptionHandler(ExceptionHandler exception) { this.wrapped = exception; } @Override public ExceptionHandler getWrapped() { return wrapped; } @Override public void handle() throws FacesException { final Iterator i = getUnhandledExceptionQueuedEvents().iterator(); while (i.hasNext()) { ExceptionQueuedEvent event = i.next(); ExceptionQueuedEventContext context = (ExceptionQueuedEventContext) event.getSource(); // get the exception from context Throwable t = context.getException(); final FacesContext fc = FacesContext.getCurrentInstance(); final Map requestMap = fc.getExternalContext().getRequestMap(); final NavigationHandler nav = fc.getApplication().getNavigationHandler(); //here you do what ever you want with exception try { //log error ? log.log(Level.SEVERE, "Critical Exception!", t); //redirect error page requestMap.put("exceptionMessage", t.getMessage()); nav.handleNavigation(fc, null, "/error"); fc.renderResponse(); // remove the comment below if you want to report the error in a jsf error message //JsfUtil.addErrorMessage(t.getMessage()); } finally { //remove it from queue i.remove(); } } //parent hanle getWrapped().handle(); } } And ad

Packaging and Deploying Node.js About Us Contact Us Write for JavaBeat Subscribe Join Us (JBC) Home >> JSF >> JSF Custom Error PagesJSF Custom Error Pages April 10, 2014 by Amr Mohammed 2 Comments When you run an application in the development project stage 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 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 404 /faces/error.xhtml 500 /faces/error.xhtml java.lang.Exception /faces/error.xhtml State saving method: 'client' or 'server' (=default). See JSF Specification 2.5.2 javax.faces.STATE_SAVING_METHOD server javax.faces.application.CONFIG_FILES /WEB-INF/faces-config.xml Faces Servlet javax.faces.webapp.FacesServlet 1 Faces Servlet /faces/* Faces Servlet *.xhtml com.sun.faces.config.ConfigureListener

error handling jsf components
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