javax.servlet. ServletException: Cannot find FacesContext

[madhup narain]

hi
i am novice user trying my hands on JSF,
i have followed the J2ee tutorial for JSF (guessNumber example)
I am using the Sun Application Server
I am getting the following error after successfully deploying the JSF


Can someone help me out

Regards

exception

javax.servlet.ServletException: Cannot find FacesContext
org.apache.jasper.runtime.PageContextImpl.doHandlePageException(PageContextImpl.java:830)
org.apache.jasper.runtime.PageContextImpl.handlePageException(PageContextImpl.java:763)
org.apache.jsp.greeting_jsp._jspService(greeting_jsp.java:116)
org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:105)
javax.servlet.http.HttpServlet.service(HttpServlet.java:860)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:336)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:301)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:251)
javax.servlet.http.HttpServlet.service(HttpServlet.java:860)
sun.reflect.GeneratedMethodAccessor110.invoke(Unknown Source)
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
java.lang.reflect.Method.invoke(Method.java:585)
org.apache.catalina.security.SecurityUtil$1.run(SecurityUtil.java:249)
java.security.AccessController.doPrivileged(Native Method)
javax.security.auth.Subject.doAsPrivileged(Subject.java:517)
org.apache.catalina.security.SecurityUtil.execute(SecurityUtil.java:282)
org.apache.catalina.security.SecurityUtil.doAsPrivilege(SecurityUtil.java:165)


root cause

javax.servlet.jsp.JspException: Cannot find FacesContext
javax.faces.webapp.UIComponentTag.doStartTag(UIComponentTag.java:405)
com.sun.faces.taglib.jsf_core.ViewTag.doStartTag(ViewTag.java:105)
org.apache.jsp.greeting_jsp._jspx_meth_f_view_0(greeting_jsp.java:131)
org.apache.jsp.greeting_jsp._jspService(greeting_jsp.java:107)
org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:105)
javax.servlet.http.HttpServlet.service(HttpServlet.java:860)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:336)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:301)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:251)
javax.servlet.http.HttpServlet.service(HttpServlet.java:860)
sun.reflect.GeneratedMethodAccessor110.invoke(Unknown Source)
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
java.lang.reflect.Method.invoke(Method.java:585)
org.apache.catalina.security.SecurityUtil$1.run(SecurityUtil.java:249)
java.security.AccessController.doPrivileged(Native Method)
javax.security.auth.Subject.doAsPrivileged(Subject.java:517)
org.apache.catalina.security.SecurityUtil.execute(SecurityUtil.java:282)
org.apache.catalina.security.SecurityUtil.doAsPrivilege(SecurityUtil.java:165)

[James Ellis]

Check the following things:

1) You have the jar files required for JSF in the right place.
2) You have the correct entries in web.xml (mine looks like this)

<!--  BEGIN new for JSF -->
  <context-param>
        <param-name>javax.faces.STATE_SAVING_METHOD</param-name>
        <param-value>client</param-value>
    </context-param>
  
  <context-param>
    <param-name>javax.faces.CONFIG_FILES</param-name>
    <param-value>/WEB-INF/faces-config.xml</param-value>
  </context-param>
  <servlet>
    <servlet-name>Faces Servlet</servlet-name>
    <servlet-class>javax.faces.webapp.FacesServlet</servlet-class>
    <load-on-startup>0</load-on-startup>
  </servlet>
  <servlet-mapping>
    <servlet-name>Faces Servlet</servlet-name>
    <url-pattern>*.jsf</url-pattern>
  </servlet-mapping>
  <!--  END new for JSF -->

3) You have the following entries at the top of your page (implementation specific)

 <%@ taglib uri="http://java.sun.com/jsf/html" prefix="h" %>
<%@ taglib uri="http://java.sun.com/jsf/core" prefix="f" %>
 

[James Ellis]

I also forgot, you can get this error if you try to go directly to the JSP page without routing your request through the faces servlet. This would happen if you went to pagename.jsp instead of pagename.jsf if you had the following entry in web.xml

<servlet-mapping>
    <servlet-name>Faces Servlet</servlet-name>
    <url-pattern>*.jsf</url-pattern>
  </servlet-mapping>  

[madhup narain]

Thanks for the reply.

My web.xml file looks like this.


?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">
<display-name>guessNumber</display-name>
<servlet>
<display-name>FacesServlet</display-name>
<servlet-name>FacesServlet</servlet-name>
<servlet-class>javax.faces.webapp.FacesServlet</servlet-class>
<load-on-startup>1</load-on-startup>
</servlet>
<servlet-mapping>
<servlet-name>FacesServlet</servlet-name>
<url-pattern>/guess/*</url-pattern>
</servlet-mapping>
</web-app>


and yes i have the tag entries at the top of my page
<%@ taglib uri="http://java.sun.com/jsf/html" prefix="h" %>
<%@ taglib uri="http://java.sun.com/jsf/core" prefix="f" %>

i guess so theres something amisss from the web.xml file

[Sergey Smirnov]

What URL you use when you call the page? It should be a prefix /guess/ between the host name and the path to the page.
See also: http://jsffaq.com/Wiki.jsp?page=WhatDoesCannotFindFacesContextExceptionMeans