(HFSJ PAge 512 - Topic "What exactly is a JspFragment)
This section in book makes a comment "there must NOT be any scripting elements in JspFragment, it can contain template text, standard and custom actions, EL but NO scriptlets, declaration or scripting expression. "
However is in't it true we could use scripting elements inside the body ? How does the above statment hold true against following ?
<c:forEach var="myitem" items="myList"> <%="I am scripting expression " %> </c:forEach>
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Salil, I am not sure the example explains why you can't have scriptlets in a JspFragment. I did a little bit more digging. As per JSP 2.0 specification
"A translation error must occur if a piece of JSP code that is to be translatedinto a JSP Fragment contains scriptlets or scriptlet expressions."
A SimpleTagSupport uses JspFragment, hence body of a simple tag can not contain scripting.. By that extension body-content for SimpleTag's can not be "JSP", only allowed values are "scriptless", "emptly", "tagdependent".
If I specify the body-content as "JSP" in TLD for a SimpleTagSupport, you will get an error.
Similarly you can not use scripting inside body of a "Tag File".
However a classic tag implemented with BodyTagSupport can contain "scripting " in its body. That is why you are able to include the scripting in standard actions.
Standard action allows scriting to be used in its body.