Custom error page.........please help me

"gbattine" <>
17 Oct 2006 09:34:45 -0700
Hi guys,
i'm working on a jsf application and i've decided to use a custom error
What i want is displaying the stacktrace of the application level'
exceptions like nullpointer,mysql exceptions a custom error
I've followed an example at the end of core java server faces book but
it's doesn' work!!
Please help me,these are my steps...
i've defined in my web.xml

  <servlet-name>Faces Servlet</servlet-name>
  <servlet-name>Faces Servlet</servlet-name>

i've errorDisplay.jsp

 <%@ taglib uri="" prefix="f" %>
 <%@ taglib uri="" prefix="h" %>

<f:subview id="dummy">

  <title><h:outputText value="Problema nell'applicazione"/></title>
 <p><h:outputText value="Un errore =E8 stato riscontrato"/></p>

 <p><h:outputText value="Ecco lo stacktrace"/></p>
 <h:inputTextarea value="#{errorBean.stackTrace}"
 rows="40" cols="80" readonly="true"/>

and this is my managed bean

package giu;

import java.sql.SQLException;
import java.util.Map;
import javax.faces.context.FacesContext;
import javax.servlet.ServletException;

public class ErrorBean {
    public String getStackTrace() {
        FacesContext context = FacesContext.getCurrentInstance();
        Map request = context.getExternalContext().getRequestMap();
        Throwable ex = (Throwable)
        StringWriter sw = new StringWriter();
        PrintWriter pw = new PrintWriter(sw);
        fillStackTrace(ex, pw);
        return sw.toString();

    private static void fillStackTrace(Throwable t, PrintWriter w) {
        if (t == null)
        if (t instanceof ServletException) {
            Throwable cause = ((ServletException) t).getRootCause();
            if (cause != null) {
                w.println("Root cause:");
                fillStackTrace(cause, w);
        } else if (t instanceof SQLException) {
            Throwable cause = ((SQLException) t).getNextException();
            if (cause != null) {
                w.println("Next exception:");
                fillStackTrace(cause, w);
        } else {
            Throwable cause = t.getCause();
            if (cause != null) {
                fillStackTrace(cause, w);

I cause mysql exceptions in my application,but i see the standard stack
trace,not my jsp page with stack trace..
i think my error is in web.xml in which 500 is only a type of
error....i've to adding mysql exceptions????
How can i do it?
Please help me

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