Error Handling In Jsf Components
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Exception Handling In Jsf
Issue Tracking Mailing Lists Project License Project Summary Project Team Source Repository About Foundation ASF jsf exception handling best practices Sponsorship Thanks Security License Home»Wiki»MyFaces Core»MyFaces Core User Guide»JSF and MyFaces Howtos»Managing Errors - Infos - Warnings Handling Server Errors Error handling for MyFaces
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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Windows Errors
A Windows error is an error that happens when an unexpected condition occurs or when a desired operation has failed. When you have an error in Windows, it may be critical and cause your programs to freeze and crash or it may be seemingly harmless yet annoying.
Blue Screen of Death
A stop error screen or bug check screen, commonly called a blue screen of death (also known as a BSoD, bluescreen), is caused by a fatal system error and is the error screen displayed by the Microsoft Windows family of operating systems upon encountering a critical error, of a non-recoverable nature, that causes the system to "crash".
Damaged DLLs
One of the biggest causes of DLL's becoming corrupt/damaged is the practice of constantly installing and uninstalling programs. This often means that DLL's will get overwritten by newer versions when a new program is installed, for example. This causes problems for those applications and programs that still need the old version to operate. Thus, the program begins to malfunction and crash.
Freezing Computer
Computer hanging or freezing occurs when either a program or the whole system ceases to respond to inputs. In the most commonly encountered scenario, a program freezes and all windows belonging to the frozen program become static. Almost always, the only way to recover from a system freeze is to reboot the machine, usually by power cycling with an on/off or reset button.
Virus Damage
Once your computer has been infected with a virus, it's no longer the same. After removing it with your anti-virus software, you're often left with lingering side-effects. Technically, your computer might no longer be infected, but that doesn't mean it's error-free. Even simply removing a virus can actually harm your system.
Operating System Recovery
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