Unknown NullPointerException when trying to run Apache MyFaces 2.0.2 application

StackOverflow https://stackoverflow.com/questions/12554539

  •  03-07-2021
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سؤال

I am trying to run a sample JSF 2.0 application which is built on Apache MyFaces 2.0.2 and Apache Trinindad 2.0.1. I am running on weblogic 11g. I am encountering an NullPointerException in trinidad internal classes which i am unable to debug. Here is the exception

javax.faces.FacesException: java.lang.NullPointerException
    at org.apache.myfaces.shared_impl.context.ExceptionHandlerImpl.wrap(ExceptionHandlerImpl.java:241)
    at org.apache.myfaces.shared_impl.context.ExceptionHandlerImpl.handle(ExceptionHandlerImpl.java:156)
    at org.apache.myfaces.lifecycle.LifecycleImpl.executePhase(LifecycleImpl.java:191)
    at org.apache.myfaces.lifecycle.LifecycleImpl.execute(LifecycleImpl.java:118)
    at javax.faces.webapp.FacesServlet.service(FacesServlet.java:189)
    at weblogic.servlet.internal.StubSecurityHelper$ServletServiceAction.run(StubSecurityHelper.java:227)
    at weblogic.servlet.internal.StubSecurityHelper.invokeServlet(StubSecurityHelper.java:125)
    at weblogic.servlet.internal.ServletStubImpl.execute(ServletStubImpl.java:300)
    at weblogic.servlet.internal.TailFilter.doFilter(TailFilter.java:26)
    at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:56)
    at com.others.CacheFilter.doFilter(CacheFilter.java:56)
    at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:56)
    at weblogic.servlet.internal.RequestEventsFilter.doFilter(RequestEventsFilter.java:27)
    at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:56)
    at weblogic.servlet.internal.WebAppServletContext$ServletInvocationAction.wrapRun(WebAppServletContext.java:3715)
    at weblogic.servlet.internal.WebAppServletContext$ServletInvocationAction.run(WebAppServletContext.java:3681)
    at weblogic.security.acl.internal.AuthenticatedSubject.doAs(AuthenticatedSubject.java:321)
    at weblogic.security.service.SecurityManager.runAs(SecurityManager.java:120)
    at weblogic.servlet.internal.WebAppServletContext.securedExecute(WebAppServletContext.java:2277)
    at weblogic.servlet.internal.WebAppServletContext.execute(WebAppServletContext.java:2183)
    at weblogic.servlet.internal.ServletRequestImpl.run(ServletRequestImpl.java:1454)
    at weblogic.work.ExecuteThread.execute(ExecuteThread.java:207)
    at weblogic.work.ExecuteThread.run(ExecuteThread.java:176)
Caused by: java.lang.NullPointerException
    at java.util.concurrent.ConcurrentHashMap.get(ConcurrentHashMap.java:768)
    at org.apache.myfaces.trinidadinternal.application.ViewDeclarationLanguageFactoryImpl._getInternalView(ViewDeclarationLanguageFactoryImpl.java:104)
    at org.apache.myfaces.trinidadinternal.application.ViewDeclarationLanguageFactoryImpl.getViewDeclarationLanguage(ViewDeclarationLanguageFactoryImpl.java:79)
    at org.apache.myfaces.application.ViewHandlerImpl.getViewDeclarationLanguage(ViewHandlerImpl.java:157)
    at javax.faces.application.ViewHandlerWrapper.getViewDeclarationLanguage(ViewHandlerWrapper.java:128)
    at org.apache.myfaces.lifecycle.RestoreViewExecutor.execute(RestoreViewExecutor.java:150)
    at org.apache.myfaces.lifecycle.LifecycleImpl.executePhase(LifecycleImpl.java:171)
    ... 20 more

This error is encountered after RESTOREVIEW PHASE of the lifecycle. Here is my web.xml.

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/javaee" xmlns:web="http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" id="WebApp_ID" version="2.5">
  <display-name>/*appname*/</display-name>
  <context-param>
    <param-name>javax.faces.PROJECT_STAGE</param-name>
    <param-value>Development</param-value>
  </context-param>
  <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>
  <context-param>
    <param-name>org.apache.myfaces.ALLOW_JAVASCRIPT</param-name>
    <param-value>true</param-value>
  </context-param>
  <context-param>
    <param-name>org.apache.myfaces.PRETTY_HTML</param-name>
    <param-value>true</param-value>
  </context-param>
  <context-param>
    <param-name>org.apache.myfaces.DETECT_JAVASCRIPT</param-name>
    <param-value>false</param-value>
  </context-param>
  <context-param>
    <param-name>org.apache.myfaces.AUTO_SCROLL</param-name>
    <param-value>true</param-value>
  </context-param>
 <context-param>
  <param-name>facelets.SKIP_COMMENTS</param-name> 
  <param-value>true</param-value> 
 </context-param>
 <context-param>
    <param-name>javax.faces.DEFAULT_SUFFIX</param-name>
    <param-value>.xhtml</param-value>
  </context-param>
    <context-param>
    <param-name>javax.faces.FACELETS_VIEW_MAPPINGS</param-name>
    <param-value>.xhtml</param-value>
  </context-param>
  <context-param>
    <param-name>org.apache.myfaces.ERROR_HANDLING</param-name>
    <param-value>false</param-value>
  </context-param>
  <context-param>
     <param-name>javax.faces.PARTIAL_STATE_SAVING_METHOD</param-name>
     <param-value>false</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>*.xhtml</url-pattern>
  </servlet-mapping>

  <servlet>
    <servlet-name>resources</servlet-name>
    <servlet-class>org.apache.myfaces.trinidad.webapp.ResourceServlet</servlet-class>
  </servlet>
  <servlet-mapping>
    <servlet-name>resources</servlet-name>
    <url-pattern>/adf/*</url-pattern>
  </servlet-mapping>

  <filter>
    <filter-name>trinidad</filter-name>
    <filter-class>org.apache.myfaces.trinidad.webapp.TrinidadFilter</filter-class>
  </filter>
  <filter-mapping>
    <filter-name>trinidad</filter-name>
    <servlet-name>faces</servlet-name>
  </filter-mapping>
    <error-page>
    <exception-type>java.lang.Exception</exception-type>
    <location>/others/Error.xhtml</location>
</error-page>
    <error-page>
    <exception-type>java.lang.NullPointerException</exception-type>
    <location>/others/Error.xhtml</location>
</error-page>
</web-app>

And here is my faces-config.xml

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

<faces-config
    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-facesconfig_2_0.xsd"
    version="2.0">

<application>
    <locale-config>
        <default-locale>en</default-locale>
        <supported-locale>en</supported-locale>
    </locale-config>
    <resource-bundle>
            <base-name>messages</base-name>
            <var>msgs</var>
        </resource-bundle>
    <default-render-kit-id>
        org.apache.myfaces.trinidad.core
    </default-render-kit-id>  
  </application>

    <lifecycle>
        <phase-listener>com.others.LifeCycleListener</phase-listener>
    </lifecycle>

</faces-config>

And Here is the Home.xhtml which i am trying to access

<!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:ui="http://java.sun.com/jsf/facelets"
    xmlns:h="http://java.sun.com/jsf/html"
    xmlns:f="http://java.sun.com/jsf/core"
    xmlns:tr="http://myfaces.apache.org/trinidad"
    xmlns:trh="http://myfaces.apache.org/trinidad/html">

<h:body>
<ui:composition template="../Templates/homelayout.xhtml">

    <ui:define name="pagetitle">Home</ui:define>


    <ui:define name="bodycontent">
        <h:outputText value="This is an output text"/>
        <h:outputText value="This is an output text"/>
        <h:outputText value="This is an output text"/>
        <h:outputText value="This is an output text"/>
        <h:outputText value="This is an output text"/>
    </ui:define>

</ui:composition>

</h:body>

And Here is my folder structure snapshot

enter image description here

Can somebody please explain me the reason for the Nullpointer Exception? and also How to solve it?

Thanks in Advance.

Update: I removed the old MyFaces 2.0.2 jars and added MyFaces 2.0.14 jars. I also added an error page in the web.xml to get the complete error info. This is the exception message it throws now.

java.lang.NullPointerException
    at java.util.concurrent.ConcurrentHashMap.get(ConcurrentHashMap.java:768)
    at org.apache.myfaces.trinidadinternal.application.ViewDeclarationLanguageFactoryImpl._getInternalView(ViewDeclarationLanguageFactoryImpl.java:104)
    at org.apache.myfaces.trinidadinternal.application.ViewDeclarationLanguageFactoryImpl.getViewDeclarationLanguage(ViewDeclarationLanguageFactoryImpl.java:79)
    at org.apache.myfaces.application.ViewHandlerImpl.getViewDeclarationLanguage(ViewHandlerImpl.java:158)
    at javax.faces.application.ViewHandlerWrapper.getViewDeclarationLanguage(ViewHandlerWrapper.java:128)
    at org.apache.myfaces.lifecycle.RestoreViewExecutor.execute(RestoreViewExecutor.java:151)
    at org.apache.myfaces.lifecycle.LifecycleImpl.executePhase(LifecycleImpl.java:171)
    at org.apache.myfaces.lifecycle.LifecycleImpl.execute(LifecycleImpl.java:118)
    at javax.faces.webapp.FacesServlet.service(FacesServlet.java:189)
    at weblogic.servlet.internal.StubSecurityHelper$ServletServiceAction.run(StubSecurityHelper.java:227)
    at weblogic.servlet.internal.StubSecurityHelper.invokeServlet(StubSecurityHelper.java:125)
    at weblogic.servlet.internal.ServletStubImpl.execute(ServletStubImpl.java:300)
    at weblogic.servlet.internal.TailFilter.doFilter(TailFilter.java:26)
    at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:56)
    at com.others.CacheFilter.doFilter(CacheFilter.java:56)
    at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:56)
    at weblogic.servlet.internal.RequestEventsFilter.doFilter(RequestEventsFilter.java:27)
    at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:56)
    at weblogic.servlet.internal.WebAppServletContext$ServletInvocationAction.wrapRun(WebAppServletContext.java:3715)
    at weblogic.servlet.internal.WebAppServletContext$ServletInvocationAction.run(WebAppServletContext.java:3681)
    at weblogic.security.acl.internal.AuthenticatedSubject.doAs(AuthenticatedSubject.java:321)
    at weblogic.security.service.SecurityManager.runAs(SecurityManager.java:120)
    at weblogic.servlet.internal.WebAppServletContext.securedExecute(WebAppServletContext.java:2277)
    at weblogic.servlet.internal.WebAppServletContext.execute(WebAppServletContext.java:2183)
    at weblogic.servlet.internal.ServletRequestImpl.run(ServletRequestImpl.java:1454)
    at weblogic.work.ExecuteThread.execute(ExecuteThread.java:207)
    at weblogic.work.ExecuteThread.run(ExecuteThread.java:176)
هل كانت مفيدة؟

المحلول

Finally Solved it.

Thanks BalusC for pointing out the type error in web.xml.

Solution:

I was trying to access my application in the following way after changing the faces servlet mapping to .xhtml.

http://hostname/contextname/faces/others/Home.xhtml

Now i just removed faces from the url and started accessing my application like this

http://hostname/contextname/others/Home.xhtml

And to my surprise it did not give any exception and shows my Home page.

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