JSP tags + scriptlet. How to enable scriptlet?
I have a page which uses a tag template. My web.xml is very basic.
I simply want to run some code in the page.
And no, I'm not interested in tags or other alternative. I want to use the bad-practice scriptlet haha.
So far I'm getting this "HTTP ERROR 500" error:
Scripting elements ( %!, jsp:declaration, %=, jsp:expression, %, jsp:scriptlet ) are disallowed here.
While my files look like:
/WEB-INF/web.xml
<?xml version="1.0" encoding="utf-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns="http://java.sun.com/xml/ns/javaee" xmlns:web="http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"
xsi:schemaLocation="http://java.sun.com/xml/ns/javaee
http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"
version="2.5">
<welcome-file-list>
<welcome-file>index.html</welcome-file>
<welcome-file>index.jsp</welcome-file>
</welcome-file-list>
</web-app>
/WEB-INF/tags/wrapper.tag
<%@tag description="Simple Wrapper Tag" pageEncoding="UTF-8"%>
<%@ attribute name="title" required="true" type="java.lang.String"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html>
<head>
<title>${title}</title>
</head>
<body>
<jsp:doBody />
</body>
</html>
index.jsp
<%@page contentType="text/html" pageEncoding="UTF-8"%>
<%@taglib prefix="t" tagdir="/WEB-INF/tags"%>
<t:wrapper>
<jsp:attribute name="title">My nice title</jsp:attribute>
<jsp:body>
<h1><%="some code generated text"%></h1>
</jsp:body>
</t:wrapper>
I have tried to modify web.xml to explicitly enable it, like this (not working):
<jsp-config>
<jsp-property-group>
<url-pattern>*.jsp</url-pattern>
<scripting-invalid>false</scripting-invalid>
</jsp-property-group>
<jsp-property-group>
<url-pattern>*.tag</url-pattern>
<scripting-invalid>false</scripting-invalid>
</jsp-property-group>
</jsp-config>
So, how do I use pure scriptlets within my tag'ed JSP?
EDIT #1:
An ideal code would look like this, inside a page that uses my template ('wrapper' as the above):
<%@page import="java.util.Calendar"%>
<%@page contentType="text/html" pageEncoding="UTF-8"%>
<%@taglib prefix="t" tagdir="/WEB-INF/tags"%>
<t:wrapper>
<jsp:attribute name="title">My nice title</jsp:attribute>
<%
final int day_of_week = Calendar.getInstance().get(
Calendar.DAY_OF_WEEK);
if (day_of_week == Calendar.SATURDAY)
{
%>
<jsp:body>
<h1>Have a nice Saturday (<%=Integer.toString(day_of_week)%>)!</h1>
</jsp:body>
<%
}
else
{
%>
<jsp:body>
<h1>Have a nice rest-of-the-week (<%=Integer.toString(day_of_week)%>)!</h1>
</jsp:body>
<%
}
%>
</t:wrapper>
See? Scriptlets between & inside the '' tags. That's exactly what I'm trying to achieve.
Answer
In this case, the container doesn't care about the value of scripting-invalid in web.xml because its looking at the tag meta-data for jsp:body which has a body-content value of scriptless. So when you see:
Scripting elements ( %!, jsp:declaration, %=, jsp:expression, %, jsp:scriptlet ) are disallowed here.
The container is complaining about the contents of jsp:body which must be scriptless. If you want to render scriptlet content in the body, you can set it as a page attribute outside of the jsp:body tag using a scriptlet and then render it using EL inside the body like so:
<% request.setAttribute("stuff", object); %>
<jsp:body>
${stuff}
</jsp:body>