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JSTL c:if not working, but c:out is working

 
Ankush Bhargava
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Hi,

I am migrating from Resin 3.0.14 to Resin 3.1.0. Everything seems to work fine, except for inconsistencies in JSTL - All jtsl 'if' tags are not working!

example:
adding this to my JSP -
<c:out value="${sessionScope.userSession.sessionValid==true}"/>

outputs a value of 'true' or 'false' based on the value of the variable 'sessionValid' in the 'userSession' bean in the HttpSession object.

but -
<c:if test="${sessionScope.userSession.sessionValid==true}">
<c:out value="${sessionScope.userSession.sessionValid}"/>
</c:if>

does not work. and neither does -
<c:if test="${sessionScope.userSession.sessionValid!=true}">
<c:out value="${sessionScope.userSession.sessionValid}"/>
</c:if>

I dont get any output from the JSP as all.

Clear JSTL is working, but only partly! I tried using c:choose, but even that did not work :-(
What could i be doing wrong?

TIA
 
Bear Bibeault
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posted 17 years ago
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Well, you can test to see if <c:if> is working in general (as I'm usre that it is) with a small JSP file such as:



If you see "true" on the browser, <c:if> is working.

What remains is to debug your test expression.

[Added: don't forget to declare the JSTL in your page]
[ April 05, 2007: Message edited by: Bear Bibeault ]

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Ankush Bhargava
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posted 17 years ago
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Hello, thanks for you reply.

I tried the code snippet you gave, and the output was -
"${result}"

so i tried:


and i got -
false

what next?
 
Ankush Bhargava
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Hello, thanks for you reply.

I tried the code snippet you gave, and the output was -
"${result}"

so i tried:


and i got -
false

what next?
 
Ben Souther
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posted 17 years ago
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Originally posted by Bear Bibeault:
Well, you can test to see if <c:if> is working in general (as I'm usre that it is) with a small HTML file such as:



Did you mean a small ".jsp" file or does Resin support JSTL in files with HTML extensions?

Java API J2EE API Servlet Spec JSP Spec How to ask a question... Simple Servlet Examples jsonf

 
Bear Bibeault
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Whoopsy. Of course it's a JSP. My bad.

I've gone back and fixed the typo...

Ankush, my apologies. Please be sure that it's a JSP file and re-run to see the results. And don't forget to declare the JSTL c library in your page.

Good catch Ben!
[ April 05, 2007: Message edited by: Bear Bibeault ]

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Ankush Bhargava
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hey no worries. I did try running the code on a JSP and not an HTML.

Infact here's exactly what i ran -


output -
false | true


I've tried many combinations of values inside the c:if tags and none seem to work.
c:out always works.
 
Ankush Bhargava
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oh, and this code runs just fine on my 3.0.14 version.
 
Bear Bibeault
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What happens if you don't use the <c:out>?

Do you still get ${result}?

If so, your web app is not configured to enable the EL in template text and it must be for the JSTL 1.1 to work properly.

What does your web.xml look like? It must declare the app as Servlets 2.4 rather than 2.3. See the JSP FAQ for details.

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Bear Bibeault
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Also, are you using Resin's builtin JSTL? Or a 3rd-party library?

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Ankush Bhargava
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1. When i don't use the c:out, I get back what I wrote. i.e. the output is -
${result}

2. Resin documentation says that default is JSTL turned on. So i haven't played with that part.
How can I toggle it?

3. web.xml -
<web-app xmlns="http://caucho.com/ns/resin"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd"
version="2.4">


4. I guess I'm using the Resin's built in JSTL, as I did not explicitly add any JSTL jar file to the build.
 
Bear Bibeault
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Originally posted by Ankush Bhargava:
1. When i don't use the c:out, I get back what I wrote. i.e. the output is -
${result}



This is an issue. Does it work in your Resin 3.0 installation?

Until you get this working, all other bets are off.

We're using Resin 3.0.17 so I don't have a 3.1 installation to test against.

2. Resin documentation says that default is JSTL turned on. So i haven't played with that part.
How can I toggle it?



It's not the JSTL that's an issue but the EL. For some reason EL in template text is not being evaluated and it must for the JSTL to work correctly.

3. web.xml -



Hmm, that looks ok.

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Ankush Bhargava
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hmmm, i see what your point.

I also tried running this against a Resin 3.0.23 installation. And that din't work either.
Now i am beginning to think if my configuration is not messy...?

Any tips on getting EL to work?
 
Ankush Bhargava
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Finally found the cause -
The build file had a 'resin-web.xml', and that skipped my sight. I added the namespaces
' xmlns="http://caucho.com/ns/resin" xmlns:resin="http://caucho.com/ns/resin/core" ' to the web-app tag and presto! EL started working.

Thanks for your help bear. Appreciate it!
 
Bear Bibeault
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Whew! I'm glad you got it working!

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