now as an example of validation i have this code
<%@ page contentType="text/html" %>
<%@ taglib prefix="c" uri="http://java.sun.com/jstl/core" %>
<html>
<head>
<title>User Info Entry Form</title>
</head>
<body bgcolor="white">
<form action="validate_jstl.jsp" method="post">
<input type="hidden" name="submitted" value="true">
<table>
<c:if test="${empty param.userName}">
<tr>
<td></td>
<td colspan="2"><font color="red">
Please enter your Name
</font></td>
</tr>
</c:if>
<tr>
<td>Name:</td>
<td>
<input type="text" name="userName"
value="<c:out value="${param.userName}" />">
</td>
</tr>
</table>
</form>
</body>
</html>I have got this error
org.apache.jasper.JasperException: According to TLD or attribute directive in tag file, attribute value does not accept any expressions
the error appear in the lines
<input type="text" name="userName"
value="<c:out value="${param.userName}" />">
and
<c:if test="${empty param.userName}">
How can i solve this problem ?
Thanks in advance