On Fri, 27 Apr 2001, Brendan McKenna wrote:
> Hi,
>
> Newbie question here. I've looked in the FAQ (and, for that
> matter, in the Servlet API specs) and am having trouble figuring out
> how to access parameters specified via <context-param> in my JSP
> pages. Am trying to use <%= application.getInitParameter(<name>)
> %>, but Jasper complains that the parameter has no value. This
> -seemed- to me to be the way to do it. I've also tried using
> config.getInitParameter(), to no avail.
>
> I am certain that the matching parameters have values in the
> web.xml file, and that the names that I am using match the names
> specified. So I figure that I must be doing something else wrong...
Probably :-).
It may be that in order for a servlet or a jsp to be able to access
context-param's, it (i.e. the servlet or jsp) must be defined in the
context's web.xml file, i.e. via a servlet tag. When defining a
servlet, you specify the servlet-class, when defining a jsp, you
specify the jsp-file. Have you done that for your jsp?
Also, when you define a servlet or jsp, it must be called via the
servlet-name you specify for it. But you can add servlet-mapping's to
specify alternate names to call it by. And the url-pattern in a
mapping can be of the form something.jsp (so you can still call a jsp
by a jsp-looking name).
Let me illustrate with an example. Suppose the context/application is
called myapp. Let's assume the context-param's are defined correctly
in the web.xml file. Then you have a jsp called foo.jsp that you want
to be part of myapp, and be able to access those context-param's.
You'd do something like:
<servlet>
<servlet-name>foo</servlet-name>
<jsp-file>foo.jsp</jsp-file>
</servlet>
<servlet-mapping>
<servlet-name>foo</servlet-name>
<url-pattern>foo.jsp</url-pattern>
</servlet-mapping>
I believe the file foo.jsp should go in <path-to-tomcat>/webapps/myapp/.
Then you should be able to access the context-param's in foo.jsp
(using either of the application or config predefined variables).
Milt Epstein
Research Programmer
Software/Systems Development Group
Computing and Communications Services Office (CCSO)
University of Illinois at Urbana-Champaign (UIUC)
[EMAIL PROTECTED]
