I've had problems with similar examples in the same book. It's a
scope problem, possibly a bug. If you examine the source code of the
generated servlet, you'll probably find that the 'db =
(DbProdBean)i.next();' line in the scriptlet is accessing a local variable
'db', while the <jsp:getProperty name="db" property="shortDescription" />
action is trying to access an attribute 'employee' of either the request or
the pageContext object.
If you want to continue using bean tags, try replacing
db = (DbProdBean)i.next();
with something like:
pageContext.setAttribute("db", (DbProdBean)i.next(),
pageContext.REQUEST_SCOPE);
What are you using for a server? This has been happening to me
under Tomcat 3.1.
-----Original Message-----
From: John Bell [mailto:[EMAIL PROTECTED]]
Sent: Tuesday, July 11, 2000 6:50 AM
Subject: Re: jsp:getProperty
I am trying to display results retrieved from a database. (using model from
Fields book)
The debug shows that the prodList Vector is sucessfully populated.
else if (cmd.equals( "cat3prod")){
DbProdBean db;
ProdUtils utils = new ProdUtils();
Vector prodList = utils.fetchAll(index);
Iterator i = prodList.iterator();
// debug
while (i.hasNext()) {
db = (DbProdBean)i.next();
System.err.println("in Ctl :" + db.getShortDescription()
+":");
System.err.println("in Ctl :" + db.getUnitCost() +":");
}
// end debug
request.setAttribute("prodList", prodList);
System.err.println("off to JSP size is " +prodList.size() );
tocat3prodpage.forward(request, response);
}
but in the JSP page I get as the correct number of 'hello's but no
shortDescriptions etc.
What am I doing wrong?
<%@ page language="java" import="java.sql.*, java.util.*%>
<jsp:useBean id="db" scope="request" class="DbProdBean" />
<html>
<head>
<title>Untitled Document</title>
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">
<body>
<%
Vector v = (Vector)request.getAttribute("prodList");
Iterator i = v.iterator();
while (i.hasNext()) {
db = (DbProdBean)i.next();
%>
<b>
hello
<jsp:getProperty name="db" property="shortDescription" />
</b><br>
<b>
<jsp:getProperty name="db" property="unitCost"/>
</b><br>
<jsp:getProperty name="db" property="prevUnitCost"/>
<% }%>
</body>
</html>
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