Using ${} expression in JSP page

[Jean-Laurent Guillot]

I am using Tomcat 5.0.30 with struts 1.2, tiles and struts-layout 1.1

I want to write
${pageContext.request.contextPath}
in a page but the JSP parser does not replace by the web application context path

In fact, I do not kown how to use '${}' expression.

Do I have to use a particular module? If so, which?

Somebody can help me where to found documentation on this subject

 

[Edwin Martin]

I am using Tomcat 5.0.30 with struts 1.2, tiles and struts-layout 1.1

I want to write
${pageContext.request.contextPath}
in a page but the JSP parser does not replace by the web application context path

In fact, I do not kown how to use '${}' expression.

Do I have to use a particular module? If so, which?

Somebody can help me where to found documentation on this subject

The online Struts documentation about "${} expressions" is very bad.

You must copy the *-el DTD's from the contrib-folder in the Struts
distrubution to your WEB-INF folder.

Dont's forget to add them to your web.xml file.

Edwin Martin

 

[Ryan Stewart]

The online Struts documentation about "${} expressions" is very bad.

You must copy the *-el DTD's from the contrib-folder in the Struts
distrubution to your WEB-INF folder.

Dont's forget to add them to your web.xml file.

You never have to either copy the TLDs (not DTDs) to WEB-INF or add mappings to
your deployment descriptor. The TLDs reside in the JAR file, and you can access
them by using their declared URIs, as per the JSP specification.

 

[Ryan Stewart]

I am using Tomcat 5.0.30 with struts 1.2, tiles and struts-layout 1.1

I want to write
${pageContext.request.contextPath}
in a page but the JSP parser does not replace by the web application context
path

In fact, I do not kown how to use '${}' expression.

Do I have to use a particular module? If so, which?

Somebody can help me where to found documentation on this subject

If you mean JSP EL, you have to use a version 2.4 deployment descriptor
(web.xml), and then you can just put an expression like what you have above in a
page. e.g. ${5 + 5} would cause "10" to be printed to the output page. For
details on the JSP EL, see the JSP specification:
http://jcp.org/aboutJava/communityprocess/final/jsr152/

If you're talking about the struts-el library, you have to use the el tags
rather than the normal Struts tags. I think they're in the "contrib" directory
of the Struts distro. Their EL is the same as JSTL EL. You can find
documentation on that here:
http://www.jcp.org/aboutJava/communityprocess/final/jsr052/