Re: Tomcat 5.5 JSP EL evaluation: what?

From:

Owen Jacobson <angrybaldguy@google-email-service.example.com>

Newsgroups:

comp.lang.java.programmer

Date:

Wed, 03 May 2006 14:30:05 GMT

Message-ID:

<pan.2006.05.03.14.29.59.199805@google-email-service.example.com>

On Wed, 03 May 2006 00:10:43 -0700, steen wrote:

Owen Jacobson wrote:

index.jsp:
<%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c" %>
<%@ taglib uri="http://java.sun.com/jsp/jstl/function" prefix="fn" %>
<html>
<head>
<title>Short, Simple Complete Compilable Code</title>
</head>
<body>
<p>${param.username}</p>
</body>
</html>

...

From the tutorial and the JSTL docs, requesting
http://..../hello1/?username=Pennywise should print "Pennywise" on the
page. Instead, it's printing the expression itself: ${param.username}

Why?

Try changing the ${param.username} to <c:out value="${param.username}"
/>
because the way your jsp looks now, you're just asking it to print the
string "${param.username}", but by calling the c:out tag magic things
will happen.
Check http://java.sun.com/webservices/docs/1.3/tutorial/doc/JSTL4.html
for further information.

According to the JSP spec that's not actually necessary in JSP 2.0.
The JSTL docs seem to confirm that; c:out makes it possible to work with
EL in JSP prior to JSP 2.0.

I think.

Version soup in here.

Anyways, point is, that didn't work either. What *did* work is using a
set of attributes on <web-app> including version="2.4"; the example as
downloaded has version="2.5".