samedi 6 juin 2015

JSF : NullPointerException in Simple testing program

I've trying to resolve it for last an hour, but in vain... Saw almost every answer related to this on stackoverflow and other forums...

Using EclipseLink 2.5.2 JPA, JSF 2.0

Eclipse Juno

index.xhtml

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" 
"http://ift.tt/kkyg93">

<html xmlns="http://ift.tt/lH0Osb"
xmlns:ui="http://ift.tt/KsEgXx"
xmlns:h="http://ift.tt/HjFrZb"
xmlns:f="http://ift.tt/HcrI1S">


<f:view>
  <h1>Register Yourself Here</h1>

  <h:form>
  <h:panelGrid>
    <h:outputText value="firstName">First Name</h:outputText>
    <h:inputText value="#{usersBean.firstName}" ></h:inputText>
  </h:panelGrid>
  <h:commandButton value="Register" action="#{usersBean.registerUser}"></h:commandButton>
</h:form>

</f:view>

</html>

web.xml

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://ift.tt/ra1lAU" xmlns="http://ift.tt/nSRXKP" xmlns:web="http://ift.tt/LU8AHS" xsi:schemaLocation="http://ift.tt/nSRXKP http://ift.tt/1eWqHMP" id="WebApp_ID" version="3.0">
  <display-name>PikUp</display-name>
  <welcome-file-list>
    <welcome-file>index.html</welcome-file>
    <welcome-file>index.htm</welcome-file>
    <welcome-file>index.jsp</welcome-file>
    <welcome-file>index.jsf</welcome-file>
    <welcome-file>default.html</welcome-file>
    <welcome-file>default.htm</welcome-file>
    <welcome-file>default.jsp</welcome-file>
  </welcome-file-list>

  <context-param>
    <description>State saving method: 'client' or 'server' (=default). See JSF Specification 2.5.2</description>
    <param-name>javax.faces.STATE_SAVING_METHOD</param-name>
    <param-value>client</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>

    <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>*.xhtml</url-pattern> 
    </servlet-mapping> 
</web-app>

faces-config.xml

<?xml version="1.0" encoding="UTF-8"?>

<faces-config
    xmlns="http://ift.tt/nSRXKP"
    xmlns:xsi="http://ift.tt/ra1lAU"
    xsi:schemaLocation="http://ift.tt/nSRXKP http://ift.tt/1cpkFEe"
    version="2.0">
    <managed-bean>
        <description>Testing Users Modification BEAN</description>
        <managed-bean-name>usersBean</managed-bean-name>
        <managed-bean-class>bean.UsersBean</managed-bean-class>
        <managed-bean-scope>session</managed-bean-scope>
    </managed-bean>

</faces-config>

Error:

Jun 06, 2015 10:36:48 PM org.apache.catalina.startup.Catalina start
INFO: Server startup in 11665 ms
Jun 06, 2015 10:36:57 PM org.apache.catalina.core.StandardWrapperValve invoke
SEVERE: Servlet.service() for servlet [Faces Servlet] in context with path [/PikUp] threw exception
java.lang.NullPointerException
    at org.apache.myfaces.shared.context.flash.FlashImpl.isKeepMessages(FlashImpl.java:395)
    at org.apache.myfaces.shared.context.flash.FlashImpl._saveMessages(FlashImpl.java:686)
    at org.apache.myfaces.shared.context.flash.FlashImpl.doPostPhaseActions(FlashImpl.java:271)
    at org.apache.myfaces.lifecycle.LifecycleImpl.render(LifecycleImpl.java:280)
    at javax.faces.webapp.FacesServlet.service(FacesServlet.java:200)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:304)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
    at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:240)
    at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:164)
    at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:462)
    at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:164)
    at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:100)
    at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:562)
    at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:118)
    at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:395)
    at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:250)
    at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:188)
    at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:166)
    at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:302)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
    at java.lang.Thread.run(Thread.java:745)
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