Apex 4.2 Integration with EBS R12.1.1

Hi Guys,
We followed the document "Oracle Applications Express The Fast Way to Extend the Oracle E-Business Suite By Rod West, Cabot Consulting [http://www.oracle.com/technetwork/developer-tools/apex/apex-ebs-wp-cabot-consulting-169064.pdf]
After doing all the steps, when we try to navigate from EBS application to Apex application by clicking on the EBS menu link it ends up with below error
"404 Not Found
Resource /OA_HTML/null/pls/apex/f not found on this server"
My url showing like this [http://<hostname>:<Apex port>/OA_HTML/null/pls/apex/f?p=101:1::APPS::::]
Can anyone can help me in this.
Brgds,
Max.

Hi Rod,
Me too, have the same problem. I have tried like you said that is i replaced the below line in LaunchApex.jsp file instead of the line
response.sendRedirect(l_launcher);
in the jsp file and also i have recompiled using the following command in the bin directory
ojspCompile.pl compile -s 'LaunchApex.jsp' retry
Now my current jsp file has the following contents
<%@ page contentType="text/html;charset=UTF-8" %><%--
/* LaunchApex.jsp */
--%><%@ page
import="java.io.*"
import="java.net.*"
import="java.sql.*"
import="javax.servlet.http.*"
import="java.util.Enumeration"
import="java.util.Properties"
import="java.lang.Math"
import="oracle.apps.fnd.common.VersionInfo"
import="oracle.apps.fnd.functionSecurity.Function"
import="oracle.apps.fnd.functionSecurity.RunFunction"
import="oracle.apps.fnd.common.WebAppsContext"
import="oracle.apps.fnd.common.AppsEnvironmentStore"
import="oracle.apps.fnd.common.WebRequestUtil"
import="oracle.apps.fnd.common.ResourceStore"
import="oracle.apps.fnd.security.CSS"
import="oracle.apps.fnd.common.Message"
import="oracle.jdbc.OracleConnection"
import="oracle.jdbc.OraclePreparedStatement"
import="oracle.jdbc.OracleResultSet" %>
<%
// Session has to be validated first
WebAppsContext ctx = WebRequestUtil.validateContext(request, response);
if (ctx==null) {
return; }
String cookieName = ctx.getSessionCookieName();
boolean validSession = ctx.validateSession(cookieName);
WebRequestUtil.setClientEncoding(response, ctx);
%>
<html>
<head>
<title>Launch Apex</title>
<!-- LaunchApex.jsp -->
</head>
<body>
<%
String p_application = request.getParameter("application");
p_application = ( p_application==null ? "NONE" : p_application);
String p_page = request.getParameter("page");
p_page = ( p_page==null ? "1" : p_page);
String p_item_names = request.getParameter("item_names");
p_item_names = ( p_item_names==null ? "" : p_item_names);
String p_item_values = request.getParameter("item_values");
p_item_values = ( p_item_values==null ? "" : p_item_values);
AppsEnvironmentStore m_env = (AppsEnvironmentStore) ctx.getEnvStore();
try {
String l_launcher = ctx.getProfileStore().getProfile("OAE_LAUNCHER");
l_launcher = l_launcher + "/pls/apex/f?p=" + p_application + ":" + p_page;
l_launcher = l_launcher + "::APPS:::" + p_item_names + ":" + p_item_values;
if (ctx!=null) ctx.freeWebAppsContext();
out.println("Apex Launch URL : <a href=\"" + l_launcher + "\" target=\"_blank\">" + l_launcher + "</a><br/>");
} //try
catch (Exception e) {
out.println("Exception found : <pre>");
e.printStackTrace(new PrintWriter(out));
out.println("</pre>");
} //catch
%>
</body>
</html>
But then too the same error like
404 Not Found
Resource /OA_HTML/null/pls/apex/f not found on this server
http://erptest03.4iapps.com:8006/OA_HTML/null/pls/apex/f?p=102:101::APPS::::I dont know where im missing.
Brgds,
Mini

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