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Source Repository About Foundation ASF Sponsorship Thanks Security License Home»Wiki»MyFaces Core»MyFaces Core User Guide»JSF and MyFaces Howtos»Managing Errors - Infos - Warnings http://stackoverflow.com/questions/10534187/why-use-a-jsf-exceptionhandlerfactory-instead-of-error-page-redirection 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 wrap/override it and add the https://myfaces.apache.org/wiki/core/user-guide/jsf-and-myfaces-howtos/managing-errors---infos---warnings/handling-server-errors.html following into your faces-config.xml: faces-config.xml
Diggs Java JSFJSF Global Exception Handler Factory Exampleby MemoryNotFound · Published December 18, 2015 · Updated December 18, 2015In this tutorial we show you how to create a Global Exception Handler http://memorynotfound.com/jsf-global-exception-handler-factory-example/ Factory. We create a factory that extends the javax.faces.context.ExceptionHandlerFactory. https://docs.oracle.com/cd/E17802_01/j2ee/javaee/javaserverfaces/2.0/docs/api/javax/faces/context/ExceptionHandler.html Here we can override the getExceptionHandler and return a new CustomExceptionHandler which will handle all the exceptions thrown by JSF.Error Throwing Managed BeanHere is a simple managed bean that'll throw an error.package com.memorynotfound.jsf; error page import javax.faces.bean.ManagedBean; import javax.faces.bean.RequestScoped; @ManagedBean @RequestScoped public class ErrorBean { public void throwError(){ throw new RuntimeException("throwing new error"); } }Custom Exception Handler FactoryWe create a factory that extends the javax.faces.context.ExceptionHandlerFactory. Here we can override the getExceptionHandler and return a new CustomExceptionHandler which will jsf error page handle all the exceptions thrown by JSF.package com.memorynotfound.jsf; import javax.faces.context.ExceptionHandler; import javax.faces.context.ExceptionHandlerFactory; public class CustomExceptionHandlerFactory extends ExceptionHandlerFactory { private ExceptionHandlerFactory exceptionHandlerFactory; public CustomExceptionHandlerFactory() { } public CustomExceptionHandlerFactory(ExceptionHandlerFactory exceptionHandlerFactory) { this.exceptionHandlerFactory = exceptionHandlerFactory; } @Override public ExceptionHandler getExceptionHandler() { return new CustomExceptionHandler(exceptionHandlerFactory.getExceptionHandler()); } }Custom Exception HandlerThis class extends from javax.faces.context.ExceptionHandlerWrapper and intercepts all the exceptions thrown by JSF. In the handle() method we access the thrown exceptions to appropriately handle them. In this case we add some information to the request scope in order to print them on a custom error page.package com.memorynotfound.jsf; import javax.faces.FacesException; import javax.faces.application.NavigationHandler; import javax.faces.context.ExceptionHandler; import javax.faces.context.ExceptionHandlerWrapper; import javax.faces.context.ExternalContext; import javax.faces.context.FacesContext; import javax.faces.event.ExceptionQueuedEvent; import javax.faces.event.ExceptionQueuedEventContext; import java.io.IOException; import java.util.Iterator; import java.util.Map; public class CustomExceptionHandler extends ExceptionHandlerWrapper { private ExceptionHandler exceptionHandler; public CustomExceptionHandler(Exce
Implemented Interfaces: EventListener, FacesListener, SystemEventListener Direct Known Subclasses: ExceptionHandlerWrapper public abstract class ExceptionHandlerextends Objectimplements SystemEventListener ExceptionHandler is the central point for handling unexpected Exceptions that are thrown during the Faces lifecycle. The ExceptionHandler must not be notified of any Exceptions that occur during application startup or shutdown. See the specification prose document for the requirements for the default implementation. Exceptions may be passed to the ExceptionHandler in one of two ways: by ensuring that Exceptions are not caught, or are caught and re-thrown. This approach allows the ExceptionHandler facility specified in section JSF.6.2 to operate on the Exception. By using the system event facility to publish an ExceptionQueuedEvent that wraps the Exception. This approach requires manually publishing the ExceptionQueuedEvent, but allows more information about the Exceptionto be stored in the event. The following code is an example of how to do this. //... } catch (Exception e) { FacesContext ctx = FacesContext.getCurrentInstance(); ExceptionQueuedEventContext eventContext = new ExceptionQueuedEventContext(ctx, e); eventContext.getAttributes().put("key", "value"); ctx.getApplication().publishEvent(ExceptionQueuedEvent.class, eventContext); } Because the Exception must not be re-thrown when using this approach, lifecycle processing may continue as normal, allowing more Exceptions to be published if necessary. With either approach, any ExceptionQueuedEvent instances that are published in this way are accessible to the handle() method, which is called at the end of each lifecycle phase, as specified in section JSF.6.2. Instances of this class are request scoped and are created by virtue of FacesContextFactory.getFacesContext(java.lang.Object, java.lang.Object, java.lang.Object, javax.faces.lifecycle.Lifecycle) calling ExceptionHandlerFactory.getExceptionHandler(). Since: 2.0 Constructor Summary ExceptionHandler() Method Summary abstract ExceptionQueuedEvent getHandledExceptionQueuedEvent() Return the first ExceptionQueuedEvent handled by this handler. abstract Iterable<