One step you need to take care of, if you haven't yet, is reading the
JSTL specification. If you had, you would have noticed that
"$param.userName" should be "${param.userName}". I'm not certain
whether this the cause of your exception, however.
> -----Original Message-----
> From: joni santoso [mailto:[EMAIL PROTECTED]
>
> here is my test.jsp :
>
> <!--
> <%@ taglib prefix="c" uri="http://java.sun.com/jstl/core";
> %>
>
> Your name is : <c:out value="$param.userName"
> default="Unknown" />
> -->
>
> when i ran it, errors happened. this is the error:
>
> root cause
> java.lang.NoClassDefFoundError
> at java.lang.Class.forName0(Native Method)
> at java.lang.Class.forName(Class.java:140)
> at
>
org.apache.taglibs.standard.lang.support.ExpressionEvaluatorManager.getE
va
> luatorByName(ExpressionEvaluatorManager.java:146)
> at
>
org.apache.taglibs.standard.tlv.JstlBaseTLV.validateExpression(JstlBaseT
LV
> .java:202)
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