bonjour , aidez moi a ressoudre ce probleme que j arrive pas a identifier la cible .
j essaye de faire une modifier en ejb/ jsf mais a chaque que je clic sur le bouton modifier cette excepton est elevé si quelqu un connais la cible de l erreur .
voici ma page jsf et l execption qu il genere
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                 <h:form>
            <h:panelGrid     columns="2" cellpadding="4"  styleClass="general"   >
                <h:outputLabel value="Nom Projet" for="livrableName"/>
                <h:outputText id="LivrableName"  value="#{livrableManager.editLivrable.livrableName}"/>
                <h:outputLabel value=" Description du livrable" for="LivrableDescription"/>
                <h:inputTextarea id="LivrableDescription" value="#{livrableManager.editLivrable.livrableDescription}" ></h:inputTextarea>
                <h:outputLabel value="Date Creation livrable" for="DateCRTLivrable"/>
                <h:inputText id="DateCRTLivrable" value="#{livrableManager.editLivrable.dateCRTLivrable}"> convertDate="javax.faces.convert.DateTimeConverter />
                <f:convertDateTime type="date"  />
                 <f:convertDateTime  type="Date"  pattern="dd/MM/yyyy"/>
                </h:inputText>
                <h:outputLabel value="Date  de  Livraison" for="DateLivraison"/>
                <h:inputText id="DateLivraison" value="#{livrableManager.editLivrable.dateLivraison}" >
                    convertDate="javax.faces.convert.DateTimeConverter />
                    <f:convertDateTime type="date"  />
                    <f:convertDateTime  type="Date"  pattern="dd/MM/yyyy"/>
                </h:inputText>
 
                 <h:outputLabel value="Naute Livrable"  for="Nature"/>
                 <h:selectOneMenu  id="Nature"  title="Nature"   value="#{livrableManager.editLivrable.nature}">
                          <f:selectItem itemValue="document"/>
                         <f:selectItem itemValue="logiciel"/>
                 </h:selectOneMenu>
                 <h:outputLabel value="Type  Livrable "  for="Type"/>
                 <h:selectOneMenu id="type" title="Type"  value="#{livrableManager.editLivrable.type}">
                  <f:selectItem itemValue="Specification"/>
                        <f:selectItem itemValue="Conception"/>
                        <f:selectItem itemValue="Test"/>
                 </h:selectOneMenu>
 
                 <h:outputLabel value=" Statut Livrable"  for="Status"/>
                 <h:selectOneMenu   id="Status"  title="Statut"   value="#{livrableManager.editLivrable.status}">
                     <f:selectItem itemValue="Initialise"/>
                        <f:selectItem itemValue="en evolution"/>
                        <f:selectItem itemValue="Abandonné"/>
                         <f:selectItem itemValue="Validé"/>
                    </h:selectOneMenu >
                  <h:outputLabel value="Projet"  for="ProjetLIVID_FK"/>
                  <h:selectOneMenu   id="ProjetLIVID_FK"  title="projet"   value="#{livrableManager.projetID}">
                      <f:selectItems  id="selctProjet"  value="#{livrableManager.projetLivItems}" />
                    </h:selectOneMenu >
                 <h:outputLabel value="Version Livrable"  for="VERSIONLIVID_FK"/>
                 <h:selectOneMenu   id="VERSIONLIVID_FKk"  title="Statut"   value="#{livrableManager.versionLivID}">
                     <f:selectItems  id="selectSatut"  value="#{livrableManager.versionLivItem}" />
                    </h:selectOneMenu >
                    <h:commandButton  value="Mettre à Jour"  action="#{livrableManager.modifierLivrable}" />
             </h:panelGrid>
        </h:form>
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javax.el.PropertyNotFoundException: /ModifierLivrable.xhtml @128,120 value="#{livrableManager.editLivrable.livrableDescription}": Target Unreachable, 'null' returned null
	at com.sun.faces.facelets.el.TagValueExpression.getType(TagValueExpression.java:93)
	at com.sun.faces.renderkit.html_basic.HtmlBasicInputRenderer.getConvertedValue(HtmlBasicInputRenderer.java:95)
	at javax.faces.component.UIInput.getConvertedValue(UIInput.java:1008)
	at javax.faces.component.UIInput.validate(UIInput.java:934)
	at javax.faces.component.UIInput.executeValidate(UIInput.java:1189)
	at javax.faces.component.UIInput.processValidators(UIInput.java:691)
	at javax.faces.component.UIComponentBase.processValidators(UIComponentBase.java:1080)
	at javax.faces.component.UIForm.processValidators(UIForm.java:243)
	at javax.faces.component.UIComponentBase.processValidators(UIComponentBase.java:1080)
	at javax.faces.component.UIComponentBase.processValidators(UIComponentBase.java:1080)
	at javax.faces.component.UIViewRoot.processValidators(UIViewRoot.java:1180)
	at com.sun.faces.lifecycle.ProcessValidationsPhase.execute(ProcessValidationsPhase.java:76)
	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.StandardWrapperValve.invoke(StandardWrapperValve.java:279)
	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:662)
merci d avance