Please help!
I'm using jswdk-1.0-ea on Linux 2.2 with blackdown.org's JDK 1.2,
pre-release-v1. I'm trying to implement the model 2 approach. It
sounds simple, I even had it working under .92 but no matter what I
do, I can't get it to work under 1.0ea.
I've read many posts from the mailing list archives including the
excellent post from Craig McClanahan
http://archives.java.sun.com/cgi-bin/wa?A2=ind9907&L=jsp-interest&F=&S=&P=7211
and the JSP FAQ. Please take a look and let me know where I'm making
the (obvious?) mistake. Any hints will be greatly appreciated.
foo is the servlet. foo instantiates the bean blah.bar, sets a data
member of the bean (userFullName) to a string, saves the bean in the
session and performs a sendRedirect to the jsp (foo.jsp). The jsp
simply calls a method in the bean to display the value that was saved
by the servlet. One thing that worries me is that a NEW instance of
the bean is created by the jsp (I know this because I have put a debug
message in the constructor).
The messages returned by the servlet runner are at the bottom.
=============================================================================
FILE: /usr/local/java/jswdk-1.0-ea/examples/jsp/blah/foo.jsp
-----------------------------------------------------------------------------
<%@ page language="java" import="blah.*" %>
<jsp:useBean id="the_state" scope="session" class="blah.bar" />
<%= the_state.getUserFullName() %>
=============================================================================
FILE: /usr/local/java/jswdk-1.0-ea/examples/WEB-INF/servlets/foo.java:
-----------------------------------------------------------------------------
import java.io.*;
import java.util.*;
import javax.servlet.*;
import javax.servlet.http.*;
import blah.*;
public class foo extends HttpServlet
{
private String JSPSCRIPTDIRECTORY = "/examples/jsp/blah"; // KLUDGE
public void init(ServletConfig config) throws ServletException
{
super.init(config);
}
public void doPost (HttpServletRequest req, HttpServletResponse res)
throws ServletException, IOException
{
// Get the session object. Create one if it doesn't exist
HttpSession session = req.getSession(true);
bar state = new bar();
state.setUserFullName("THIS IS A STRING");
session.putValue("the_state", state);
res.sendRedirect(JSPSCRIPTDIRECTORY + "/foo.jsp");
}
public void doGet (HttpServletRequest req, HttpServletResponse res)
throws ServletException, IOException
{
doPost(req, res);
}
}
=============================================================================
FILE: /usr/local/java/jswdk-1.0-ea/examples/WEB-INF/jsp/beans/blah/bar.java
-----------------------------------------------------------------------------
package blah;
import java.io.*;
public class bar implements Serializable
{
public String userFullName;
public bar ()
{
System.out.println("*** IN bar::bar ***");
}
public String getUserFullName()
{
return ("ABCD" + userFullName);
}
public void setUserFullName(String uname)
{
userFullName = uname;
}
}
=============================================================================
Output:
startserver print this on the console:
Loaded configuration from file:/usr/local/java/jswdk-1.0-ea/default.cfg
endpoint created: :8080
com.sun.web.core.InvokerServlet: init
foo: init
*** IN bar::bar ***
com.sun.jsp.runtime.JspServlet: init
Scratch dir for JSP-generated servlets is: work/%3A8080%2Fexamples
IMPORTANT: Do not modify the generated servlets
JspEngine --> /usr/local/java/jswdk-1.0-ea/examples/jsp/blah/foo.jsp
*** IN bar::bar ***
NOTE that the bar object is being created twice: Once in the servlet
and the second time by the jsp. I want the jsp to use the object that
was created by the servlet.
-----------------------------------------------------------------------------
In lynx, I see:
ABCDnull
(please note the 'null')
Thank you so very much for any help...
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