Error Handling Jsf 1.2
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Orchestra ExtVal Portlet Bridge Test Commons Ext-Scripting Sandbox Others Project Documentation Documentation Index JSF Intro Quick Start Getting Started FAQ Confluence Wiki Public Wiki Compatibility Continuous Integration Issue Tracking Mailing Lists Project License Project Summary Project Team Source Repository About Foundation ASF Sponsorship Thanks Security License Home»Wiki»MyFaces Core»MyFaces Core User Guide»JSF and MyFaces Howtos»Managing Errors - http://stackoverflow.com/questions/13347692/jsf-1-2-exception-handling Infos - Warnings Handling Server Errors Error handling for MyFaces 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 https://myfaces.apache.org/wiki/core/user-guide/jsf-and-myfaces-howtos/managing-errors---infos---warnings/handling-server-errors.html wrap/override it and add the following into your faces-config.xml: faces-config.xml 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 ExceptionHandl
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 our control. For obvious reasons, filling a http://www.softwareengineeringsolutions.com/thoughts/frameworks/JSF.Techniques-Error.Handling.htm user's screen with a Java stack trace 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 the "error page mechanism", and describes how HTTP error codes or uncaught exception types can error handling 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 element in web.xml, which maps either an or an to a resource's . The exception type is specified as the fully qualified class name of the exception (such as java.lang.Throwable); the error code is specified as an HTTP status error code (such as a 404 or error handling jsf a 500); and the location is specified as a URL. If the resource is a dynamic resource (such as a JSP or a servlet), the container will also make available to it, the request and response objects. It will also stuff in additional request attributes that will help the dynamic resource determine the specific error condition. These request attributes include: · javax.servlet.error.status_code – the HTTP status code; · javax.servlet.error.exception – the specific exception thrown, as a java.lang.Throwable. You can use this exception to get its message, print its stack trace, etc. · javax.servlet.error.request_uri – the URI of the original request, whose processing led to this error. · javax.servlet.error.servlet_name – the logical name of the servlet in which the error occurred. This mechanism kicks in when an uncaught exception is propagated up to the container, or when sendError() is called on the response to send an error code in the 4xx or 5xx ranges. 2. MyFaces Error Handling Both Facelets and MyFaces themselves provide additional error handling support – and surface a stack trace, the component tree, and request parameters to the user. This is often considered a security risk, as the information provided has the potential to be used against the application itself. Consequently, one of the most important items on your reading list should be the document on MyFaces Error Handling. 3. Error Handling Strategies One of the key decisions
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