Re: <c:set> and runtime expressions

If you need to run JSTL 1.0 and want to use JSP expressions as attribute 
values, you need to use the "RT-based" versions. For JSTL, there are 
basically two distinct versions of each taglib:

<%@ taglib prefix="c"    uri="http://java.sun.com/jstl/core" %>
<%@ taglib prefix="c_rt" uri="http://java.sun.com/jstl/core_rt" %>

If you look at the TLD files for JSTL 1.0, you'll see:

c.tld:
------
   <tag>
     <name>set</name>
...
     <attribute>
         <name>value</name>
         <required>false</required>
         <rtexprvalue>false</rtexprvalue>
     </attribute>
...
   </tag>

c-rt.tld:
---------
  <tag>
     <name>set</name>
...
     <attribute>
         <name>value</name>
         <required>false</required>
         <rtexprvalue>true</rtexprvalue>
     </attribute>
...
   </tag>

JSTL 1.0 has to handle EL evaluation on its own (it's integrated into JSP 
2.0 so JSTL 1.1 doesn't need to do the evaluation), so you're forced to 
make a choice between different taglibs that use EL expressions or JSP 
expressions.

Tarek Nabil wrote:
> Hi everyone,
> 
>  
> 
> I was using JSTL 1.1 in my application, and then unfortunately, I had to
> downgrade to 1.0. Now, my IDE is complaining about this line in my JSP
> 
>  
> 
>     <c:set var="config" value="<%= Config.getInstance() %>"/>
> 
>  
> 
> It says "Attribute value does not accept runtime expressions.
> 
>  
> 
> This used to work perfectly when I was using 1.1. I tried to look at the
> changes between 1.1 and 1.0 but I can not see anything related to this
> issue. Is this really a difference between 1.0 and 1.1 or am I doing
> something wrong?
> 
>  
> 
> Thanks in advance for your help.

-- 
Kris Schneider <mailto:[email protected]>
D.O.Tech       <http://www.dotech.com/>