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This is the master POM file for Oracle's Implementation of the JSF 2.2 Specification.

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 * and Distribution License("CDDL") (collectively, the "License").  You
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package javax.faces.context;

import javax.faces.FacesException;
import javax.faces.event.AbortProcessingException;
import javax.faces.event.ExceptionQueuedEvent;
import javax.faces.event.SystemEvent;
import javax.faces.event.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 {@link * ExceptionQueuedEvent} that wraps the Exception.

    * *

    This approach requires manually publishing the {@link * 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 {@link #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 {@link FacesContextFactory#getFacesContext} calling {@link * ExceptionHandlerFactory#getExceptionHandler}.

* *
* * @since 2.0 */ public abstract class ExceptionHandler implements SystemEventListener { /** *

Take action to handle the * Exception instances residing inside the {@link * ExceptionQueuedEvent} instances that have been queued by calls to * Application().publishEvent(ExceptionQueuedEvent.class, * eventContext). The requirements of the default * implementation are detailed in section JSF.6.2.1.

* @throws FacesException if and only if a problem occurs while * performing the algorithm to handle the Exception, not * as a means of conveying a handled Exception itself. * * @since 2.0 */ public abstract void handle() throws FacesException; /** *

Return the first * ExceptionQueuedEvent handled by this handler.

*/ public abstract ExceptionQueuedEvent getHandledExceptionQueuedEvent(); /** *

Return an Iterable over * all ExceptionQueuedEvents that have not yet been handled * by the {@link #handle} method.

*/ public abstract Iterable getUnhandledExceptionQueuedEvents(); /** *

The default implementation must * return an Iterable over all * ExceptionQueuedEvents that have been handled by the {@link * #handle} method.

*/ public abstract Iterable getHandledExceptionQueuedEvents(); /** * {@inheritDoc} */ public abstract void processEvent(SystemEvent exceptionQueuedEvent) throws AbortProcessingException; /** * {@inheritDoc} */ public abstract boolean isListenerForSource(Object source); /** *

Unwrap the argument t * until the unwrapping encounters an Object whose * getClass() is not equal to * FacesException.class or * javax.el.ELException.class. If there is no root cause, null is returned.

* @throws NullPointerException if argument t is * null. * @since 2.0 */ public abstract Throwable getRootCause(Throwable t); }




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