What's the difference between struts-base and struts-el?

[Michael Cheung <vi...@justware.co.jp>]

Hi, all;

What's the difference between struts-base
to struts-el.

Document here said:
http://struts.apache.org/1.2.9/userGuide/building_view.html#struts-el
Standard support JSP expression like <%= stringvar %>
and
EL support EL expression.

But my test on base taglib shows, EL expression is supported, but JSP
expression is not supported. 

I am confused in web_app 2.3,2.4(servlet version?), 
JSTL 1.0, 1.1, 1.2, 2.0(JSP version?). It seems many is changed between
them.

And the difference between c.tld in struts, c.-rt.tld in struts, c.tld in JSTL,
c-rt.tld in JSTL is also confused me.

Any suggestion is very appreciated.

Thanks a lot!

Regards;
Michael


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RE: What's the difference between struts-base and struts-el?

["Karr, David" <da...@wamu.net>]

One comment inline. 

> -----Original Message-----
> From: Scott Van Wart [mailto:scott@indosoft.com] 
> Sent: Wednesday, August 16, 2006 5:53 PM
> To: Struts Users Mailing List
> Subject: Re: What's the difference between struts-base and struts-el?
> 
> Michael Cheung wrote:
> > Hi, all;
> >
> > What's the difference between struts-base to struts-el.
> >   
> My general understanding is:
> - struts-el is so you can use EL expressions in your Struts 
> tags without having to use servlet 2.4.  The JSP compiler 
> won't compile the EL, so it's up to Struts to do it.  Use the 
> regular Struts taglib if you know your JSP compiler supports EL.
> - Servlet 2.3 supports EL, but is disabled by default (you 
> need isELIgnored="false" or something like that at the top of 
> every JSP).

No, servlet 2.3 does not support the EL in any way, except to completely
ignore it so that the tag code itself (in struts-el) can process it.

> - Servlet 2.4 has it enabled by default.
> - You can disallow <% (java) %> stuff in your JSPs by 
> specifying it in your web.xml in Servlet 2.4
> - JSTL 1.0 is used when you don't have EL support--same 
> reason why Struts provides struts-el.
> - JSTL 1.1 is used when you DO have EL support, so the JSTL 
> doesn't need to handle EL itself.
> - Not sure about the c-rt.tld you refer to, I haven't encountered it.
> 
> I suspect all these confusing differences are the result of 
> an emerging technology.  Java's resisted this whole dynamic 
> programming thing (I hear Mustang's going to push the 
> envelope, however), so the EL was a bit of a workaround 
> that's now being adopted as people update their servlet containers.
> 
> - Scott
> 
> 
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> 

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Re: What's the difference between struts-base and struts-el?

[Scott Van Wart <sc...@indosoft.com>]

Michael Cheung wrote:
> Hi, all;
>
> What's the difference between struts-base
> to struts-el.
>   
My general understanding is:
- struts-el is so you can use EL expressions in your Struts tags without 
having to use servlet 2.4.  The JSP compiler won't compile the EL, so 
it's up to Struts to do it.  Use the regular Struts taglib if you know 
your JSP compiler supports EL.
- Servlet 2.3 supports EL, but is disabled by default (you need 
isELIgnored="false" or something like that at the top of every JSP).
- Servlet 2.4 has it enabled by default.
- You can disallow <% (java) %> stuff in your JSPs by specifying it in 
your web.xml in Servlet 2.4
- JSTL 1.0 is used when you don't have EL support--same reason why 
Struts provides struts-el.
- JSTL 1.1 is used when you DO have EL support, so the JSTL doesn't need 
to handle EL itself.
- Not sure about the c-rt.tld you refer to, I haven't encountered it.

I suspect all these confusing differences are the result of an emerging 
technology.  Java's resisted this whole dynamic programming thing (I 
hear Mustang's going to push the envelope, however), so the EL was a bit 
of a workaround that's now being adopted as people update their servlet 
containers.

- Scott


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