This should "just work". Here's a simple example with implicit navigation. The only gotcha is that when you are mixing JSP and Facelets with implicit navigation, I've found that you must include the file extension in the implicit navigation.
./web/WEB-INF/web.xml
<?xml version="1.0" encoding="UTF-8"?>
<web-app version="3.0" xmlns="
http://java.sun.com/xml/ns/javaee" xmlns:xsi="
http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="
http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd">
<context-param>
<param-name>javax.faces.PROJECT_STAGE</param-name>
<param-value>Development</param-value>
</context-param>
<servlet>
<servlet-name>Faces Servlet</servlet-name>
<servlet-class>javax.faces.webapp.FacesServlet</servlet-class>
<load-on-startup>1</load-on-startup>
</servlet>
<servlet-mapping>
<servlet-name>Faces Servlet</servlet-name>
<url-pattern>/faces/*</url-pattern>
</servlet-mapping>
<servlet-mapping>
<servlet-name>Faces Servlet</servlet-name>
<url-pattern>*.jsf</url-pattern>
</servlet-mapping>
<session-config>
<session-timeout>
30
</session-timeout>
</session-config>
<welcome-file-list>
<welcome-file>faces/index.xhtml</welcome-file>
</welcome-file-list>
</web-app>
./web/index.xhtml
<?xml version='1.0' encoding='UTF-8' ?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "
http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="
http://www.w3.org/1999/xhtml"
xmlns:h="
http://java.sun.com/jsf/html">
<h:head>
<title>JSP and Facelets in One Project</title>
</h:head>
<h:body>
Implicit navigation from Facelets to JSP and back.
<h:form>
<h:commandButton action="toJsp.jsp" value="To JSP" />
</h:form>
</h:body>
</html>
./web/toFacelets.xhtml
<?xml version='1.0' encoding='UTF-8' ?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "
http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="
http://www.w3.org/1999/xhtml"
xmlns:h="
http://java.sun.com/jsf/html">
<h:head>
<title>Facelet Title</title>
</h:head>
<h:body>
<h:form>
<h:commandButton action="index" value="Return to first page" />
</h:form>
</h:body>
</html>
./web/toJsp.jsp
<%--
Document : toJsp
Created on : Jun 30, 2010, 10:46:08 PM
Author : edburns
--%>
<%_at_page contentType="text/html" pageEncoding="UTF-8"%>
<%@taglib prefix="f" uri="
http://java.sun.com/jsf/core" %>
<%@taglib prefix="h" uri="
http://java.sun.com/jsf/html"%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
"
http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>JSP Page</title>
</head>
<body>
<f:view>
<h:form>
<h:commandButton action="toFacelets.xhtml" value="To Facelets" />
</h:form>
</f:view>
</body>
</html>
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