Target Unreachable, identifier 'navigationBean' resolved to null [duplicate] - jsf-2

Question

I am developing an application for FB Login with website using Javascript and JSF. I have posted my code at here. The problem is, when I run my application it does't show the JSF page, it instead throws the following exception:
Nov 28, 2013 7:21:46 PM org.apache.catalina.core.StandardWrapperValve invoke
SEVERE: Servlet.service() for servlet [Faces Servlet] in context with path [/FacebookLogin] threw exception [javax/servlet/jsp/jstl/core/Config] with root cause
java.lang.NoClassDefFoundError: javax/servlet/jsp/jstl/core/Config
at com.sun.faces.application.view.JspViewHandlingStrategy.executePageToBuildView(JspViewHandlingStrategy.java:344)
at com.sun.faces.application.view.JspViewHandlingStrategy.buildView(JspViewHandlingStrategy.java:153)
at com.sun.faces.lifecycle.RenderResponsePhase.execute(RenderResponsePhase.java:99)
at com.sun.faces.lifecycle.Phase.doPhase(Phase.java:101)
at com.sun.faces.lifecycle.LifecycleImpl.render(LifecycleImpl.java:139)
at javax.faces.webapp.FacesServlet.service(FacesServlet.java:594)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:305)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:222)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:123)
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:472)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:171)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:99)
at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:953)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:118)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:408)
at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1023)
at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:589)
at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:310)
at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
at java.lang.Thread.run(Unknown Source)
What is the problem here and how can I solve it?

Answer 1

java.lang.NoClassDefFoundError: javax/servlet/jsp/jstl/core/Config
As the package name hints, the mentioned class is part of JSTL. The exception is clearly telling that the class definition file of the mentioned class cannot be found in the runtime classpath. I.e. the Config.class file or at least the JAR file containing that class is missing in webapp's runtime classpath.
JSTL is normally already provided out the box by a full fledged Java EE container such as TomEE, JBoss AS/EAP/WildFly, Payara/GlassFish, WebLogic, etc but not by barebones JSP/Servlet containers such as Tomcat and Jetty. For them, you'd need to supply JSTL along with the web application yourself, exactly like as you'd do for JSF (which is also already provided out the box by full fledged Java EE containers).
You're facing this exception because Facelets has for its <c:xxx> tags a dependency on the JSTL implementation JAR file, while you're using Tomcat which doesn't ship with JSTL out the box. JSTL is as a separate library available in flavor of jstl-1.2.jar. Just download and drop it in your webapp's /WEB-INF/lib folder, along with the JSF JAR file(s) which you already placed there, and this exception should disappear. Maven users can achieve that by adding the below dependency (and performing a full rebuild/redeploy):
<dependency>
<groupId>javax.servlet</groupId>
<artifactId>jstl</artifactId>
<version>1.2</version>
</dependency>
Alternatively, just replace Tomcat by a real Java EE container.
See also:
Our JSF wiki page - contains JSF installation instructions

Answer 2

I just want to add my contribute if someone gets this error trying to create a springframework-4.0.7-RELEASE module for jboss-eap-6.4.0.GA. My module.xml now contains:
<dependencies>
...
<!-- Contains javax.servlet.jsp.jstl.core.Config -->
<module name="javax.servlet.jstl.api"/>
...
</dependencies>