How to handle exception in JSF2.0?

Hello to all,
I am try to use new feature of exception handling in JSF2.0. Requirement is to show the stack trace on the error pageusing JSF2.0 exception Handling feature, if any unhandled exception occur . Problem is that, when exception is occurring , error page is displayed but it is not displaying the error info that I am trying to display. I think I am not able to use the proper EL to retrieve the value. Please suggest.....

Below are the codes:

faces-config.xml

ExceptionHandlerFactory

Custom ExceptionHandler

package com.sample.exceptions;

import java.util.Iterator;
import java.util.Map;

import javax.faces.FacesException;
import javax.faces.application.NavigationHandler;
import javax.faces.application.ViewExpiredException;
import javax.faces.context.ExceptionHandler;
import javax.faces.context.ExceptionHandlerWrapper;
import javax.faces.context.FacesContext;
import javax.faces.el.PropertyNotFoundException;
import javax.faces.event.ExceptionQueuedEvent;
import javax.faces.event.ExceptionQueuedEventContext;

public class SampleCustomExceptionHandler extends ExceptionHandlerWrapper {
	
	private ExceptionHandler exceptionHandler;
	
	public SampleCustomExceptionHandler(ExceptionHandler exceptionHandler)
	{	System.out.println("SampleCustomExceptionHandler");
		this.exceptionHandler = exceptionHandler;
	}
	@Override
	public ExceptionHandler getWrapped() {
		System.out.println("getWrapped"+" "+this.exceptionHandler );
		return this.exceptionHandler;
	}
	
	@Override
	public void handle() throws FacesException {
		System.out.println("handle()");
		for(Iterator<ExceptionQueuedEvent> i = getUnhandledExceptionQueuedEvents().iterator();i.hasNext();)
		{
			ExceptionQueuedEvent exceptionQueuedEvent =i.next();
			System.out.println("Iterating over ExceptionQueuedEvents.current:"+exceptionQueuedEvent.toString());
			
			ExceptionQueuedEventContext exceptionQueuedEventContext = (ExceptionQueuedEventContext) exceptionQueuedEvent.getSource();
			
			Throwable throwable = exceptionQueuedEventContext.getException();
		
			
			if (throwable instanceof Throwable)
			{
				Throwable t = (Throwable)throwable;
				
				FacesContext facesContext = FacesContext.getCurrentInstance();
				
				Map<String, Object> requestMap = facesContext.getExternalContext().getRequestMap();
				NavigationHandler navigationHandler = facesContext.getApplication().getNavigationHandler();
				
				try{
					requestMap.put("currentView", t.getMessage());
					facesContext.getExternalContext().getFlash().put("exceptioniNFO",t.getCause());
					navigationHandler.handleNavigation(facesContext,null, "/error?faces-redirect=true");
					facesContext.renderResponse();
				}finally{
					i.remove();
					
				}
			}
			
		}
			getWrapped().handle();
	}

}

web.xml

error.xhtml

code process fine, excetionFactory and customExceptionHandler also does well and when any exception occurs error page is also displayed. but the problem is that - only static messages are being displayed, its not displaying the value from EL. One other problem is that when I am making any change in error.xhtml then I need to run it explicitly to make it compile and then only its reflecting the changes when actual application throws any exception and it navigates to the error page.

I am very new to JSF, and I am finding it difficult to get the solution. It would be a great help, if anybody can suggest some solution.

Thanks in advance,
Amrit Pandey

I believe that you assume there is a connection between exception and faces messages. There is not. So you have to manually extract message from exceptions and push them into faces messages.