IE7 Does Not Display Custom Error Pages

Question

Hi,
I set up the "Handling Servlet Exceptions (http://www.oracle.com/technology/sample_code/tech/java/codesnippet/servlets/handlingservletexceptions/handlingservletexceptions.html#log) sample code in JDev 10.1.3 on a WindowsXP desktop.
After modifying the web.xml to run the sample "Catch500Error" servlet I discovered IE7 will not display the custom error page but Mozilla Firefox will.
The web.xml looks like this:
<web-app>
<description>web.xml file for HandlingServletExceptions Application</description>
<servlet>
<servlet-name>CatchError500</servlet-name>
<servlet-class>oracle.otnsamples.servlets.CatchError500</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>CatchError500</servlet-name>
<url-pattern>/catcherror500</url-pattern>
</servlet-mapping>
<session-config>
<session-timeout>35</session-timeout>
</session-config>
<error-page>
<error-code>500</error-code>
<location>/web/500error.html</location>
</error-page>
</web-app>
Does anyone know how to get IE7 to display the custom error page?
TIA,
Jim

Answer 1

The post documents a problem with 'dashboard designer' not 'sharepoint designer' as the post above mentions. I tried the solution that Jilu posts and that does not fix the problem for dashboard designer.
I figured this out. In the master page gallery where my custom master page was deployed, I had to edit the details, change the content type to 'publishing master page'. After that change there was then UI versions for 3 and 4. I change the UI to 4, published
the  master page document in the library then dashboard designer saw the custom master page. 
Andy Fitch