Sample Error jsp page?

[A Harry]

I'm trying to setup a error page that will show struts errors or other errors. I have a jsp page that has the isErrorPage="true" set at the top & is defined in web.xml as

<error-page>
<exception-type>java.lang.Exception</exception-type>
<location>/jsp/error.jsp</location>
</error-page>

in the jsp page Struts errors are handled like this -

<logic:messagesPresent>
<table width="400" border="1" bordercolor="#FF0000">
<tr>
<td>
<html:errors/>
</td>
</tr>
</table>
</logic:messagesPresent>
<logic:messagesNotPresent>
An unspecified error has occurred.
</logic:messagesNotPresent>

I want to display in the messagesNotPresent bit the top cause of the exception thrown i.e SQLException, ServletException etc...

Anybody got an example of how best to show this?

many thanks

harry