I see, so I have to do constants.getMyKey(). I guess that's easy enough. David
From: "Karr, David" <[EMAIL PROTECTED]>
Reply-To: "Struts Users Mailing List" <[EMAIL PROTECTED]>
To: "Struts Users Mailing List" <[EMAIL PROTECTED]>
Subject: RE: JSTL Question (EL vs. RT + Struts)
Date: Wed, 20 Nov 2002 14:05:03 -0800
There is none. JavaBeans. JavaBeans. JavaBeans.
> -----Original Message-----
> From: David Graham [mailto:[EMAIL PROTECTED]]
>
> But what is the EL expression to get a constant like Constants.MY_KEY?
>
> David
>
> >From: "Craig R. McClanahan" <[EMAIL PROTECTED]>
> >
> >On Wed, 20 Nov 2002, Hohlen, John wrote:
> >
> > > Date: Wed, 20 Nov 2002 13:14:43 -0600
> > > From: "Hohlen, John" <[EMAIL PROTECTED]>
> > > Reply-To: Struts Users Mailing List
> <[EMAIL PROTECTED]>
> > > To: "Struts-Help (E-mail)" <[EMAIL PROTECTED]>
> > > Subject: JSTL Question (EL vs. RT + Struts)
> > >
> > > My team is starting a new project with Struts. In our
> previous Struts
> > > projects, our JSPs used mostly tags from the Struts tag
> libraries. For
> >our
> > > new project, I want my team to start using the JSTL. For
> that reason,
> >the
> > > "Struts-EL" subproject is very appealing because it will force our
> > > developers to learn the JSTL -- as functionality
> duplicated in the
> >Struts
> > > libraries (Bean & Logic) are removed when it is available
> in the JSTL.
> > > Obviously, we'll still be using many of the Struts tags
> -- especially
> >those
> > > tied to the Struts framework (e.g. all tags in the Struts "html"
> >library).
> > > However, we're not sure whether to use the "Request Time"
> (RT) version
> >or
> > > the "Expression Language" (EL) version of the JSTL
> library. And we have
> >the
> > > same question for the "Struts" subproject (Struts-EL or
> Struts-RT)?
> > >
> >
> >The "EL" version is normally the one you want to use,
> because that is what
> >actually enables expression language support.
> >
> >The "RT" version has exactly the same tags and attributes,
> but does not
> >recognize EL expressions. It was created for the rare, but
> possible, case
> >that someone might have used a tag like this in a JSP page:
> >
> > <mytags:foo bar="${baz}"/>
> >
> >and expected the "bar" property of the tag to actually
> receive "${baz}"
> >the way it would have prior to EL support. (An EL-enabled
> version of the
> >tag would look up the "baz" attribute in
> page/request/session/application
> >scope and assign that value to bar.)
> >
> > > Does anyone have any advice here? Will JSTL compliant
> application
> >servers
> > > be required to implement a "EL" and "RT" version of the
> JSTL, or will
> >they
> > > only have to implement the "EL" version?
> > >
> > > One other issue: We want to reference constants declared
> in our Java
> >files
> > > in our JSP. These are often the bean or error key
> constants. This
> >helps
> > > guard against a String typo in the JSP as any mistyped
> constant name
> >will
> > > get caught a JSP compile time -- where a string typo will not be
> >detected
> > > until JSP execution time. Does anyone how to reference
> Java variables
> >in
> > > your JSP if you're using the JSTL-EL tags? Is this even
> possible? If
> >not,
> > > what are the alternatives?
> > >
> >
> >As was pointed out by others, the EL libraries don't
> recognize runtime
> >expressions so you can't use "<%= ... %>" to get these.
> Your alternatives
> >would be:
> >
> >* Go to the RT version (but give up EL expressions)
> >
> >* Store the constants you need under some well known names,
> > perhaps in application scope, so that you can use an
> > EL expression to get them.
> >
> > > Thanks,
> > >
> > > JOHN
> >
> >Craig
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