Hi Jay,
I think this is an issue which was resolved with JSP 2.0. The problem is
that an exception passed via web.xml uses the servlet spec, i.e. the
scoped variables set are :
javax.servlet.error.status_code java.lang.Integer
javax.servlet.error.exception_type java.lang.Class
javax.servlet.error.message java.lang.String
javax.servlet.error.exception java.lang.Throwable
javax.servlet.error.request_uri java.lang.String
javax.servlet.error.servlet_name java.lang.String
And the JSP 1.2 specs uses:
javax.servlet.jsp.jspException
So when you use web.xml for error handling (using JSP 1.2/Servlets 2.3)
you get a NullPointerException because you are trying to access
"javax.servlet.jsp.jspException" (i.e. exception) when it doesn't exist,
"javax.servlet.error.exception java.lang.Throwable" exists.
To solve the problem now, try something like:
<%
if (exception == null) {
exception = (java.lang.Throwable)
request.getAttribute("javax.servlet.error.exception
java.lang.Throwable"); //remove line-wrap...
}
%>
And you should be set. FYI, JSP 2.0 should do this automatically for
you, however, officially check the spec ;)
You should keep an eye on http://www.jspbook.com - Kevin Jones and I
have been working hard on a JSP 2.0 and Servlet 2.4 book which will be
out to compliment the upcoming specs. We cover this topic along with the
million other JSP/Servlet things you should know about!
Cheers,
Jayson Falkner
[EMAIL PROTECTED]
Jay Burgess wrote:
> (I tried this question on the Tomcat list, and got no response. Maybe it's
> more of a JSP question? Thanks in advance.)
>
>> Can someone explain the relationship between the <error-page> element in
>> my webapp's WEB.XML versus the "errorPage" attribute of the page
>> directive
>> within a JSP? I'm trying to create a single error page that handles any
>> exceptions generated by the JSPs within my webapp, without having to name
>> the error page in every JSP.
>>
>> To start with, I added the following to my web app's WEB.XML to
>> indicate a
>> "catch all" error page for the app:
>>
>> <error-page>
>> <exception-type>java.lang.Exception</exception-type>
>> <location>/error.jsp</location>
>> </error-page>
>>
>> I also marked ERROR.JSP as an error page by including the following at
>> the
>> top (note the isErrorPage attribute):
>>
>> <%@ page contentType="text/html; charset=ISO-8859-1" buffer="64kb"
>> isErrorPage="true" %>
>>
>> Unfortunately, when trying to access the "exception" object in ERROR.JSP,
>> I get a NullPointerException, as though it doesn't exist.
>>
>> Since I thought this should work, I must be missing something? (I'm
>> using
>> Tomcat 4.0.4, by the way.)
>>
>> Thanks.
>>
>> Jay
>
>
>
> -- Jay Burgess [[EMAIL PROTECTED]]
> Digital Archaeology Corporation
> (913) 438-9444 x154
>
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Some relevant FAQs on JSP/Servlets can be found at:
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