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First of all, please bare my ignorance. This may be a very basic question. But I am not to find it out.
I see some thing like this in the code. I dont understand what a JSTL is. Whatever I search, it redirects to JSTL related articles, which I seldom understand !
${applicationVersionNumber}
What does this mean ? From where this value is read ? Any help is highly appreciated.
Also I see the below on top of my file. Which one of these three lines is actually required for ${applicationVersionNumber} to work ?
<%@ taglib uri="http://java.sun.com/jsp/jstl/fmt" prefix="fmt"%>
<%@ taglib prefix="fn" uri="http://java.sun.com/jsp/jstl/functions" %>
<%@ taglib uri="http://jakarta.apache.org/taglibs/log-1.0" prefix="log"%>
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<%@ is the directive attribute. You may include a page or may declare a tag-library using <%@ More on it here.
There are three types of JSP elements you can use: directive, action, and scripting. A new construct added in JSP 2.0 is an Expression Language (EL) expression; let's call this a forth element type, even though it's a bit different than the other three.
EL expressions can use parentheses to group subexpressions. For example, ${(1 + 2) * 3} equals 9, but ${1 + (2 * 3)} equals 7. The valid values of this attribute are true and false. If it is true, EL expressions are ignored when they appear in static text or tag attributes.
None of the taglib is necessary as it is a JSP 2.0 standard.
It just print the content of the variable in the document.
For more details about the EL expressions, this is the documentation you're looking for: http://java.sun.com/products/jsp/syntax/2.0/syntaxref207.html#1010522
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