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JSP Expression

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posted 19 years ago

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Here is my Jsp source.

<html>
<body>
<%!
String text="Welcome to Expression language";
%>
Welcome to the jsp programming.
<br/>
<strong>If you see this page, it means jsp are also funtioning properly.</strong>
Text = ${text}
</body>
</html>

When I deploy this jsp on tomcat server. For some reason expression ${text} is not replaced with the text Instead I am just seeing ${text} as is was.

Expected output for the expression part is :
-----------------------------------
Text = Welcome to Expression language
-------------------------------------

Did I miss something here.

Thanks!!

Shiva
[ November 22, 2005: Message edited by: shiva rao ]

Barry Gaunt

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posted 19 years ago

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"Did I miss something here."

Yes, the correct forum. Moving to JSP...

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Derek Clarkson

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posted 19 years ago

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Hmmm, you might want to check the server versions you are on and what JSTL and EL they support. Without checking myself, I remember reading that only the very latest spec versions support using ${test} inside the html in this manner. Previous versions of the spec do not support this and you will need to use

Instead. Check up on the JSTL tags and how to use them.
[ November 22, 2005: Message edited by: Derek Clarkson ]

Bear Bibeault

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posted 19 years ago

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What version of Tomcat? Is your web app declared as a Servlet 2.4 web app? (See JSP FAQ)

The fact that the EL expression is not being evaluated means that the EL is not enabled. You must be using a JSP 2.0 container (Tomcat 5) and the web app must be declared as 2.4.

But....

once the EL is enabled you will fnd that this does not do what you expect.

The variable text is a scripting variable, while the EL operates upon scoped variables.
[ November 22, 2005: Message edited by: Bear Bibeault ]

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shiva rao

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posted 19 years ago

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Thanks a lot for the reply. Here are the server details:

I am using Tomcat 5.5 and it supports JSP 2.0.
Here are the common jars it is refering to .

commons-el.jar
jasper-compiler-jdt.jar
jasper-compiler.jar
jasper-runtime.jar
jsp-api.jar
naming-factory-dbcp.jar
naming-factory.jar
naming-resources.jar
servlet-api.jar

And can you guys tell me how do I know whether server enabled or disabled the EL. And also where can I do that.

Thanks.
Shiva

Bear Bibeault

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posted 19 years ago

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There is an entry in the JSP FAQ.

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Bosun Bello

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posted 19 years ago

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As posted above, make sure the top of your DD is defined as using 2.4 as below
-------------------------------------------------
xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd"
version="2.4">

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