JSF Newbie:Cannot find FacesContext
I just start learning JSF and having problem with the installation part.
I try to run the JSF example which I downloaded from http://java.sun.com/j2ee/javaserverfaces/download.html. I copy the jsf-guessnumber.war to /webapps directory under my tomcat.
when I try to access http://localhost:81/jsf-guessNumber/index.jsp, I got the following error.
org.apache.jasper.JasperException: Cannot find FacesContext
org.apache.jasper.servlet.JspServletWrapper.handleJspException(JspServletWrapper.java:512)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:377)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:314)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:264)
javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
what is the problem? Do I have to configure my tomcat server?
[900 byte] By [
monkeya] at [2007-11-27 3:31:03]
# 1
You need to invoke the FacesServlet to activate the FacesContext.Look in the servlet-mapping of the FacesServlet in the web.xml. If the url-pattern of the FacesServlet is something like *.jsf, then you have to invoke the page as /index.jsf instead of index.jsp.
# 2
I've changed servlet-mapping of my web.xml to
<servlet-mapping>
<servlet-name>Faces Servlet</servlet-name>
<url-pattern>/index.jsf</url-pattern>
</servlet-mapping>
and this is the content of my index.jsp( as a testing page)
<%@page contentType="text/html"%>
<%@page 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>
<body>
<f:view>
<h1><h:outputText value="JavaServer Faces" /></h1>
</f:view>
</body>
</body>
</html>
And I get the following error
org.apache.jasper.JasperException: Exception in JSP: /index.jsp:17
14:</head>
15:<body>
16: <body>
17: <f:view>
18: <h1><h:outputText value="JavaServer Faces" /></h1>
19: </f:view>
20:</body>
Stacktrace:
org.apache.jasper.servlet.JspServletWrapper.handleJspException(JspServletWrapper.java:506)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:377)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:314)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:264)
javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
root cause
javax.servlet.ServletException: Cannot find FacesContext
org.apache.jasper.runtime.PageContextImpl.doHandlePageException(PageContextImpl.java:843)
org.apache.jasper.runtime.PageContextImpl.handlePageException(PageContextImpl.java:776)
org.apache.jsp.index_jsp._jspService(index_jsp.java:83)
org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:97)
javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:334)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:314)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:264)
javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
root cause
javax.servlet.jsp.JspException: Cannot find FacesContext
what is the problem?
Thank You,
# 3
Likely you don't understand the servlet-mapping. I recommend you to read thoroughout the Java EE tutorial here http://java.sun.com/javaee/5/docs/tutorial/doc/ to get more insights in the material. Servlets starts at chapter 3.
You need to specify an URL match -not a full page- in the url-pattern. For example<url-pattern>*.jsf</url-pattern>
Then every page which is called with the *.jsf extension will be passed through the FacesServlet, which on it's turn creates the FacesContext.
# 4
(when using Sun JSF 1.1 implementation)
<context-param>
<param-name>javax.faces.CONFIG_FILES</param-name>
<param-value>/WEB-INF/my-faces-config.xml, /WEB-INF/your-faces-config.xml</param-value>
</context-param>
<context-param>
<param-name>com.sun.faces.verifyObjects</param-name>
<param-value>false</param-value>
</context-param>
<context-param>
<param-name>com.sun.faces.validateXml</param-name>
<param-value>true</param-value>
</context-param>
<context-param>
<param-name>javax.faces.STATE_SAVING_METHOD</param-name>
<param-value>server</param-value>
</context-param>
<servlet>
<servlet-name>Faces Servlet</servlet-name>
<servlet-class>javax.faces.webapp.FacesServlet</servlet-class>
<init-param>
<param-name>config</param-name>
<param-value>/WEB-INF/faces-config.xml</param-value>
</init-param>
<init-param>
<param-name>debug</param-name>
<param-value>3</param-value>
</init-param>
<init-param>
<param-name>detail</param-name>
<param-value>3</param-value>
</init-param>
<load-on-startup>1</load-on-startup>
</servlet>
<servlet-mapping>
<servlet-name>Faces Servlet</servlet-name>
<url-pattern>*.jsf</url-pattern>
</servlet-mapping>
well to my knowledge you need to configure the discussed parameters too which might be critical @ times..
# 5
Critical? Many of those aren't required. Here is the full web.xml which is sufficient to run a basic implementation of JSF.<?xml version="1.0" encoding="UTF-8" ?>
<web-app
xmlns="http://java.sun.com/xml/ns/j2ee" version="2.4"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd">
<servlet>
<servlet-name>FacesServlet</servlet-name>
<servlet-class>javax.faces.webapp.FacesServlet</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>FacesServlet</servlet-name>
<url-pattern>*.jsf</url-pattern>
</servlet-mapping>
</web-app>
# 6
I dont know what is the problem,
but I think, something wrong with my servlet-mapping, both of the following not working for me..
<servlet-mapping>
<servlet-name>Faces Servlet</servlet-name>
<url-pattern>*.jsf</url-pattern>
</servlet-mapping>
and
<servlet-mapping>
<servlet-name>Faces Servlet</servlet-name>
<url-pattern>/index.jsf</url-pattern>
</servlet-mapping>
I use tomcat 5 and jsf1.1.
Do I need to copy any thing to my tomcat directory?
eg. jar file?
# 7
<?xml version="1.0" encoding="UTF-8" ?>
<web-app
xmlns="http://java.sun.com/xml/ns/j2ee" version="2.4"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd">
<servlet>
<servlet-name>FacesServlet</servlet-name>
<servlet-class>javax.faces.webapp.FacesServlet</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>FacesServlet</servlet-name>
<url-pattern>*.jsf</url-pattern>
</servlet-mapping>
</web-app>
I've try to to copy the coding above and paste it to my web.xml but I still get the same error..
Thanks,
# 8
I've already solved the problem, the problem was because of the tomcat server that I use, previously I use Apache Tomcat 5(MSI package),
I try to download jakarta-tomcat.zip and unzip it to my C:\ drive, and I try to run jsf page and it's working.
Thanks to all of your replies.
:-)
