JSF 2.0 exception handling

[N Ha]

Hello,

I want to throw a custom exception "AppException" in my controller, where this AppException extends Exception. And to catch it in my CustomExceptionHandler.
The problem is that when I go to the CustomExceptionHandler, I get the exception as "FacesException" not "AppException "

<factory>
<exception-handler-factory>com.web.common.exceptions.DefaultExceptionHandlerFactory</exception-handler-factory>
</factory>

public class DefaultExceptionHandlerFactory extends ExceptionHandlerFactory {
public ExceptionHandler getExceptionHandler() {
ExceptionHandler eh = new DefaultExceptionHandler(parent.getExceptionHandler());
return eh;
}
}

public class DefaultExceptionHandler extends ExceptionHandlerWrapper {
public void handle() throws FacesException {
Iterator i = getUnhandledExceptionQueuedEvents().iterator();
while (i.hasNext()) {
ExceptionQueuedEvent event = (ExceptionQueuedEvent) i.next();
ExceptionQueuedEventContext context =
(ExceptionQueuedEventContext)event.getSource();

//obtain throwable object
Throwable t = context.getException();
............
}
}
}

Any help?