Thanks a lot Kris for the explanation. Actually, I'm starting to feel that moving to JSTL 1.0 was not such a wise move. There are a lot of things that I used to be able to do with the Struts tag libraries that I can not do with JSTL. One of them is the example I mentioned. Currently, the only work around for me is to do this
<% Config config = Config.getIntance(); %> And then use config in later EL expressions. This is exactly what I don't want to do, but unfortunately, it seems there's no other way around it. I'm starting to feel that JSTL has some severe limitations. Even with 1.1, I ran before into the problem of not being able to use constants. Someone on this list kindly suggested the non standard tag library, but the way it works (I guess) is that it uses reflection to expose those static fields as properties, which is a very artificial solution. I mean, why isn't this supported by default? I believe this is a question for the JSR experts to answer. -----Original Message----- From: Kris Schneider [mailto:[EMAIL PROTECTED] Sent: Monday, April 03, 2006 5:57 PM To: Tag Libraries Users List Subject: Re: <c:set> and runtime expressions Tarek Nabil wrote: > So that means if I use the RT-based version, then I won't be able to use > EL? That's quite strange, because 1.1 could handle both, so it has to be > doable. In fact, that's exactly what it means. It's only as of JSP 2.0 that EL evaluation is done by the container. This means that both EL expressions and JSP expressions can be used as RT attribute values. So, JSTL 1.1 isn't really handling anything, it's the JSP 2.0 container. Since JSP 1.2 doesn't do EL evaluation, it's up to a taglib (JSTL 1.0, for example) to do it. That's why the versions of the JSTL 1.0 taglibs that support EL evaluation have attributes with rtexprvalue = false. > -----Original Message----- > From: Kris Schneider [mailto:[EMAIL PROTECTED] > Sent: Monday, April 03, 2006 6:26 AM > To: Tag Libraries Users List > Subject: 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/> --------------------------------------------------------------------- To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] ********************************************DISCLAIMER******************************************** This email and any files transmitted with it are confidential and contain privileged or copyright information. If you are not the intended recipient you must not copy, distribute or use this email or the information contained in it for any purpose other than to notify us of the receipt thereof. If you have received this message in error, please notify the sender immediately, and delete this email from your system. Please note that e-mails are susceptible to change.The sender shall not be liable for the improper or incomplete transmission of the information contained in this communication,nor for any delay in its receipt or damage to your system.The sender does not guarantee that this material is free from viruses or any other defects although due care has been taken to minimise the risk. ************************************************************************************************** --------------------------------------------------------------------- To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
