How to create error  handeller page in Jdeveloper 11 (Version 11.1.1.1.0)

Hi,
I have created error.jsp page also added in web. XML but it is not catching exception
error.jsp
<body>
<h2>Your application has generated an error</h2>
<h3>Please check for the error given below</h3>
<b>Exception:</b><br>
<font color="red"><%= exception.toString() %></font>
</body>
Web.xml
<error-page>
<error-code>500</error-code>
<location>/Error.jsp</location>
</error-page>
<error-page>
<exception-type>java.lang.Throwable</exception-type>
<location>/Error.jsp</location>
</error-page>
after login page i am getting these exception
java.lang.NullPointerException
     at view.security.UserAccess.get(UserAccess.java:30)
     at javax.el.MapELResolver.getValue(MapELResolver.java:164)
     at javax.el.CompositeELResolver.getValue(CompositeELResolver.java:143)
     at com.sun.faces.el.FacesCompositeELResolver.getValue(FacesCompositeELResolver.java:72)
     at com.sun.el.parser.AstValue.getValue(AstValue.java:118)
     Truncated. see log file for complete stacktrace
>
but it is not redirecting to error page
also i am using adf.config.xml (task flow )for mapping pages so how to resolve these issue
can anybody help me
is there any another way to create error page
Thanx in advance..!!!
Amol

Hi Frank ,
Thanx for replying
Where i have to define error is there any sample application that may helpful for me
Also, I have created sample JSF page in thse
ErrorDiaplay.jspx
<?xml version='1.0' encoding='windows-1252'?>
<jsp:root xmlns:jsp="http://java.sun.com/JSP/Page" version="2.1"
xmlns:f="http://java.sun.com/jsf/core"
xmlns:h="http://java.sun.com/jsf/html"
xmlns:af="http://xmlns.oracle.com/adf/faces/rich">
<jsp:directive.page contentType="text/html;charset=windows-1252"
isErrorPage="true"/>
<f:view>
<af:document id="d1">
<af:form id="f1">
<af:panelFormLayout id="pfl1">
<f:facet name="footer"/>
<jsp:scriptlet>
out.println(exception);
</jsp:scriptlet>
</af:panelFormLayout>
</af:form>
</af:document>
</f:view>
</jsp:root>
Let me know where i have to define...
Regards,
Amol

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