j'ai suivi un tuto pour faire une appli web CRUD http://netbeans.org/kb/docs/web/jsf20-crud.html
après avoir généré les entités et les pages xhtml pour chaque entité conformement au tuto, j'ai une erreur à l'éxecution:
Stack Trace
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java.lang.NullPointerException
    at javax.faces.component.UIComponentBase.getRenderer(UIComponentBase.java:1268)
    at javax.faces.component.UIComponentBase.decode(UIComponentBase.java:788)
    at org.ajax4jsf.component.AjaxViewRoot$1.invokeRoot(AjaxViewRoot.java:396)
    at org.ajax4jsf.component.AjaxViewRoot.processPhase(AjaxViewRoot.java:229)
    at org.ajax4jsf.component.AjaxViewRoot.processDecodes(AjaxViewRoot.java:409)
    at com.sun.faces.lifecycle.ApplyRequestValuesPhase.execute(ApplyRequestValuesPhase.java:78)
    at com.sun.faces.lifecycle.Phase.doPhase(Phase.java:101)
    at com.sun.faces.lifecycle.LifecycleImpl.execute(LifecycleImpl.java:118)
    at javax.faces.webapp.FacesServlet.service(FacesServlet.java:312)
    at org.apache.catalina.core.StandardWrapper.service(StandardWrapper.java:1523)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:343)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:215)
    at org.ajax4jsf.webapp.BaseXMLFilter.doXmlFilter(BaseXMLFilter.java:178)
    at org.ajax4jsf.webapp.BaseFilter.handleRequest(BaseFilter.java:290)
    at org.ajax4jsf.webapp.BaseFilter.processUploadsAndHandleRequest(BaseFilter.java:390)
    at org.ajax4jsf.webapp.BaseFilter.doFilter(BaseFilter.java:517)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:256)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:215)
    at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:277)
    at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:188)
    at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:641)
    at com.sun.enterprise.web.WebPipeline.invoke(WebPipeline.java:97)
    at com.sun.enterprise.web.PESessionLockingStandardPipeline.invoke(PESessionLockingStandardPipeline.java:85)
    at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:185)
    at org.apache.catalina.connector.CoyoteAdapter.doService(CoyoteAdapter.java:325)
    at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:226)
    at com.sun.enterprise.v3.services.impl.ContainerMapper.service(ContainerMapper.java:165)
    at com.sun.grizzly.http.ProcessorTask.invokeAdapter(ProcessorTask.java:791)
    at com.sun.grizzly.http.ProcessorTask.doProcess(ProcessorTask.java:693)
    at com.sun.grizzly.http.ProcessorTask.process(ProcessorTask.java:954)
    at com.sun.grizzly.http.DefaultProtocolFilter.execute(DefaultProtocolFilter.java:170)
    at com.sun.grizzly.DefaultProtocolChain.executeProtocolFilter(DefaultProtocolChain.java:135)
    at com.sun.grizzly.DefaultProtocolChain.execute(DefaultProtocolChain.java:102)
    at com.sun.grizzly.DefaultProtocolChain.execute(DefaultProtocolChain.java:88)
    at com.sun.grizzly.http.HttpProtocolChain.execute(HttpProtocolChain.java:76)
    at com.sun.grizzly.ProtocolChainContextTask.doCall(ProtocolChainContextTask.java:53)
    at com.sun.grizzly.SelectionKeyContextTask.call(SelectionKeyContextTask.java:57)
    at com.sun.grizzly.ContextTask.run(ContextTask.java:69)
    at com.sun.grizzly.util.AbstractThreadPool$Worker.doWork(AbstractThreadPool.java:330)
    at com.sun.grizzly.util.AbstractThreadPool$Worker.run(AbstractThreadPool.java:309)
    at java.lang.Thread.run(Thread.java:619)
component tree
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<AjaxViewRoot id="_viewRoot" immediate="false" inView="true" locale="fr_FR" renderRegionOnly="false" rendered="true" selfRendered="false" submitted="false" transient="false">
    javax_faces_location_HEAD
 
    <ComponentResourceContainer id="javax_faces_location_HEAD" inView="true" rendered="true" transient="false">
 
        <UIOutput id="j_idt5" inView="true" rendered="true" transient="false"/>
 
    </ComponentResourceContainer>
 
    <UIOutput id="j_idt3" inView="true" rendered="true" transient="false"/>
 
    <UIOutput id="j_idt6" inView="true" rendered="true" transient="false">
 
        <HtmlForm enctype="application/x-www-form-urlencoded" id="j_idt8" inView="true" prependId="true" rendered="true" submitted="false" transient="false">
 
            <HtmlCommandLink disabled="false" id="j_idt9" immediate="false" inView="true" rendered="true" transient="false"/>
 
        </HtmlForm>
 
        <HtmlForm enctype="application/x-www-form-urlencoded" id="j_idt10" inView="true" prependId="true" rendered="true" submitted="false" transient="false">
 
            <HtmlCommandLink disabled="false" id="j_idt11" immediate="false" inView="true" rendered="true" transient="false"/>
 
        </HtmlForm>
 
        <HtmlForm enctype="application/x-www-form-urlencoded" id="j_idt12" inView="true" prependId="true" rendered="true" submitted="false" transient="false">
 
            <HtmlCommandLink disabled="false" id="j_idt13" immediate="false" inView="true" rendered="true" transient="false"/>
 
        </HtmlForm>
 
        <HtmlForm enctype="application/x-www-form-urlencoded" id="j_idt14" inView="true" prependId="true" rendered="true" submitted="false" transient="false">
 
            <HtmlCommandLink disabled="false" id="j_idt15" immediate="false" inView="true" rendered="true" transient="false"/>
 
        </HtmlForm>
 
        <HtmlForm enctype="application/x-www-form-urlencoded" id="j_idt16" inView="true" prependId="true" rendered="true" submitted="false" transient="false">
 
            <HtmlCommandLink disabled="false" id="j_idt17" immediate="false" inView="true" rendered="true" transient="false"/>
 
        </HtmlForm>
 
        <HtmlForm enctype="application/x-www-form-urlencoded" id="j_idt18" inView="true" prependId="true" rendered="true" submitted="false" transient="false">
 
            <HtmlCommandLink disabled="false" id="j_idt19" immediate="false" inView="true" rendered="true" transient="false"/>
 
        </HtmlForm>
 
        <HtmlForm enctype="application/x-www-form-urlencoded" id="j_idt20" inView="true" prependId="true" rendered="true" submitted="false" transient="false">
 
            <HtmlCommandLink disabled="false" id="j_idt21" immediate="false" inView="true" rendered="true" transient="false"/>
 
        </HtmlForm>
 
        <HtmlForm enctype="application/x-www-form-urlencoded" id="j_idt22" inView="true" prependId="true" rendered="true" submitted="false" transient="false">
 
            <HtmlCommandLink disabled="false" id="j_idt23" immediate="false" inView="true" rendered="true" transient="false"/>
 
        </HtmlForm>
 
        <HtmlForm enctype="application/x-www-form-urlencoded" id="j_idt24" inView="true" prependId="true" rendered="true" submitted="false" transient="false">
 
            <HtmlCommandLink disabled="false" id="j_idt25" immediate="false" inView="true" rendered="true" transient="false"/>
 
        </HtmlForm>
 
    </UIOutput>
 
</AjaxViewRoot>
Scopds variables
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Name    Value
j_idt22    j_idt22
j_idt22:j_idt23    j_idt22:j_idt23
View AttributesName    Value
None
Request AttributesName    Value
ajaxContext    org.ajax4jsf.context.AjaxContextImpl@667469
Flash AttributesName    Value
None
Session AttributesName    Value
None
Application AttributesName    Value
csfcff    com.sun.faces.context.flash.ELFlash@64d325
merci pour votre aide