On Thu, 10 Oct 2002, Stefan wrote:
> Hi,
>
> I would like to use substring on a c: out like so:
>
> <c:out value="${value.activity.substring(0,4)}"/>
No, this can't be done in JSTL 1.0. You'll be able to define functions in
the EL in JSP 2.0, but for now, any attempt to do so should yield a
translation-time error, as the syntax isn't supported.
> It works but at the same time I get this error:
>
> 500 Servlet Exception
> java.lang.reflect.InvocationTargetException
> at sun.reflect.GeneratedMethodAccessor9.invoke(Unknown Source)
> at
>sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
> at java.lang.reflect.Method.invoke(Method.java:324)
> at com.caucho.el.MethodExpr.evalObject(MethodExpr.java:105)
You might want to mail the Caucho folks and ask them about this; their
implementation is different from Jakarta Taglibs's. Note again that it
*shouldn't* work; if it does, then an implementation isn't JSTL-compliant.
You can use other tag libraries like the String Taglib to perform string
manipulation in your JSP pages.
--
Shawn Bayern
"JSTL in Action" http://www.jstlbook.com
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