It shouldn't work; a.get("b") is not supported in any form by the JSTL 1.0
expression language, whether in <c:out> or elsewhere. JSP 2.0 will
introduce functions that could conceivably be mapped to such a method,
though only through a static wrapper that would cause the expression to
look more like
${get(dynabean, property)}
--
Shawn Bayern
"JSTL in Action" http://www.jstlbook.com
On Mon, 28 Oct 2002, Karr, David wrote:
> So you're telling us that referencing "${item.a_nomefile}" in a "c:out" tag,
> where "item" is an instance of DynaActionForm (or a subclass) actually
> prints out the value of that property? I recently started looking into this
> issue, and I frankly don't see how that can work. The properties of a
> DynaActionForm are not declared with standard JavaBeans accessors, they are
> stored in a HashMap. I'm investigating the possibility of an enhancement to
> DynaActionForm which just adds an accessor for the HashMap, which would then
> allow you to specify an EL expression to get DynaActionForm properties.
>
> > -----Original Message-----
> > From: flare [mailto:flare@;flare.it]
> > Sent: Monday, October 28, 2002 1:05 PM
> > To: Tag Libraries Users List
> > Subject: Re: JSTL BUG? Url problem
> >
> >
> > > On Sun, 27 Oct 2002, flare wrote:
> > >
> > > Irrespective of whether you're using DynaBeans or not, if
> > it works in
> > > the latter case, it should work in the former one. That is, the two
> > > expressions you've shown are identical, and both tags evaluate their
> > > attributes as String objects.
> >
> > <c:forEach var="item" items="${requestScope.asteAllegati}"
> > varStatus="status">
> > <c:url value="/showAllegati.do" var="show">
> > <c:param name="id" value="${requestScope.id}"/>
> > <c:param name="tipo" value="${requestScope.tipo}" />
> > <c:param name="key" value="${item.a_nomefile}" />
> > </c:url>
> > ...
> >
> > I've tried but doesn't work.. if I try to render the url with
> > a dynabean accessor (a_nomefile or
> > others) I get an error, the out tag works fine instead.
> > I'm using JSTL on Resin 2.1.5 + Linux
> >
> > 500 Servlet Exception
> >
> > javax.servlet.jsp.JspException: An error occurred while
> > evaluating custom
> > action attribute "value" with value "${item.a_nomefile}":
> > Unable to find
> > a value for "a_nomefile" in object of class
> > "org.apache.commons.beanutils.BasicDynaBean"
> > using operator "." (null)
> > at
> > org.apache.taglibs.standard.lang.jstl.Evaluator.evaluate(Evalu
> > ator.java:146)
> > at
> > org.apache.taglibs.standard.lang.jstl.Evaluator.evaluate(Evalu
> > ator.java:166)
> > at
> > org.apache.taglibs.standard.lang.support.ExpressionEvaluatorMa
> > nager.evaluate(Expressio
> > nEvaluatorManager.java:112)
> > at
> > org.apache.taglibs.standard.tag.el.core.ExpressionUtil.evalNot
> > Null(ExpressionUtil.java:85)
> > at
> > org.apache.taglibs.standard.tag.el.core.ParamTag.evaluateExpre
> > ssions(ParamTag.java:14
> > 8)
> > at
> > org.apache.taglibs.standard.tag.el.core.ParamTag.doStartTag(Pa
> > ramTag.java:100)
> > (...)
> >
> >
> > --
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