FacesMessageExceptionHandler (OmniFaces 4.0 API)

java.lang.Object
- jakarta.faces.context.ExceptionHandler
- - jakarta.faces.context.ExceptionHandlerWrapper
  - - org.omnifaces.exceptionhandler.FacesMessageExceptionHandler

All Implemented Interfaces:

FacesListener, SystemEventListener, FacesWrapper<ExceptionHandler>, EventListener
```
public class FacesMessageExceptionHandler
extends ExceptionHandlerWrapper
```
The FacesMessageExceptionHandler will add every exception as a global FATAL faces message.
Installation

This handler must be registered by a factory as follows in faces-config.xml in order to get it to run:
```
 <factory>
     <exception-handler-factory>org.omnifaces.exceptionhandler.FacesMessageExceptionHandlerFactory</exception-handler-factory>
 </factory>
 
```
Note

It's your own responsibility to make sure that the faces messages are being shown. Make sure that there's a <h:messages> or any equivalent component (OmniFaces, PrimeFaces, etc) is present in the view and that it can handle global messages and that it's explicitly or automatically updated in case of ajax requests. Also make sure that you don't have bugs in rendering of your views. This exception handler is not capable of handling exceptions during render response. It will fail silently.
Customizing FacesMessageExceptionHandler

If more fine grained control of creating the FATAL faces message is desired, then the developer can opt to extend this FacesMessageExceptionHandler and override the following method:
- createFatalMessage(Throwable)
Since:

1.8

Author:

Bauke Scholtz

See Also:

FacesMessageExceptionHandlerFactory

Constructor Summary

Constructors
Constructor Description

FacesMessageExceptionHandler(ExceptionHandler wrapped)
Construct a new faces message exception handler around the given wrapped exception handler.

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`protected String`	`createFatalMessage(Throwable exception)`	Create fatal message based on given exception which will in turn be passed to `FacesContext.addMessage(String, jakarta.faces.application.FacesMessage)`.
`void`	`handle()`	Set every exception as a global FATAL faces message.

Methods inherited from class jakarta.faces.context.ExceptionHandlerWrapper
getHandledExceptionQueuedEvent, getHandledExceptionQueuedEvents, getRootCause, getUnhandledExceptionQueuedEvents, getWrapped, isListenerForSource, processEvent

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- Constructor Detail
  - FacesMessageExceptionHandler
```
public FacesMessageExceptionHandler(ExceptionHandler wrapped)
```
    Construct a new faces message exception handler around the given wrapped exception handler.
    
    Parameters:
    
    wrapped - The wrapped exception handler.
- Method Detail
  - handle
```
public void handle()
```
    Set every exception as a global FATAL faces message.
    
    Overrides:
    
    handle in class ExceptionHandlerWrapper
  - createFatalMessage
```
protected String createFatalMessage(Throwable exception)
```
    Create fatal message based on given exception which will in turn be passed to FacesContext.addMessage(String, jakarta.faces.application.FacesMessage). The default implementation returns Throwable.toString().
    
    Parameters:
    
    exception - The exception to create fatal message for.
    
    Returns:
    
    The fatal message created based on the given exception.