[EJB3 Entity] persist ManyToOne

salut,
j'ai deux entités profil et role je voudrai persiter un profil qui va faire référence à un role déjà créé. L'entité role est bien crée et sa persistence marche mais quand je veux ajouter un profil avec un role qui existe j'ai cette erreur
type Rapport d'exception

Message

DescriptionLe serveur a rencontré une erreur interne () qui l'a empêché de remplir cette requête.

Code:

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Exception 
 
javax.servlet.ServletException: viewId:/BackOffice/indexProfil.jsf - View /BackOffice/indexProfil.jsf could not be restored.
Cause racine 
 
javax.faces.application.ViewExpiredException: viewId:/BackOffice/indexProfil.jsf - View /BackOffice/indexProfil.jsf could not be restored.

l'exception en détail

Code:

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GRAVE: JSF1054: (Phase ID: RESTORE_VIEW 1, View ID: ) Exception thrown during phase execution: javax.faces.event.PhaseEvent[source=com.sun.faces.lifecycle.LifecycleImpl@139de8b]
GRAVE: StandardWrapperValve[Faces Servlet]: PWC1406 : servlet.service() pour le servlet Faces Servlet a émis une exception.
javax.faces.application.ViewExpiredException: viewId:/BackOffice/indexProfil.jsf - View /BackOffice/indexProfil.jsf could not be restored.
	at com.sun.faces.lifecycle.RestoreViewPhase.execute(RestoreViewPhase.java:185)
	at com.sun.faces.lifecycle.Phase.doPhase(Phase.java:100)
	at com.sun.faces.lifecycle.RestoreViewPhase.doPhase(RestoreViewPhase.java:103)
	at com.sun.faces.lifecycle.LifecycleImpl.execute(LifecycleImpl.java:118)
	at javax.faces.webapp.FacesServlet.service(FacesServlet.java:244)
	at org.apache.catalina.core.ApplicationFilterChain.servletService(ApplicationFilterChain.java:427)
	at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:315)
	at org.apache.catalina.core.StandardContextValve.invokeInternal(StandardContextValve.java:287)
	at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:218)
	at org.apache.catalina.core.StandardPipeline.doInvoke(StandardPipeline.java:648)
	at org.apache.catalina.core.StandardPipeline.doInvoke(StandardPipeline.java:593)
	at com.sun.enterprise.web.WebPipeline.invoke(WebPipeline.java:94)
	at com.sun.enterprise.web.PESessionLockingStandardPipeline.invoke(PESessionLockingStandardPipeline.java:98)
	at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:222)
	at org.apache.catalina.core.StandardPipeline.doInvoke(StandardPipeline.java:648)
	at org.apache.catalina.core.StandardPipeline.doInvoke(StandardPipeline.java:593)
	at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:587)
	at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:1096)
	at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:166)
	at org.apache.catalina.core.StandardPipeline.doInvoke(StandardPipeline.java:648)
	at org.apache.catalina.core.StandardPipeline.doInvoke(StandardPipeline.java:593)
	at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:587)
	at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:1096)
	at org.apache.coyote.tomcat5.CoyoteAdapter.service(CoyoteAdapter.java:288)
	at com.sun.enterprise.web.connector.grizzly.DefaultProcessorTask.invokeAdapter(DefaultProcessorTask.java:647)
	at com.sun.enterprise.web.connector.grizzly.DefaultProcessorTask.doProcess(DefaultProcessorTask.java:579)
	at com.sun.enterprise.web.connector.grizzly.DefaultProcessorTask.process(DefaultProcessorTask.java:831)
	at com.sun.enterprise.web.connector.grizzly.DefaultReadTask.executeProcessorTask(DefaultReadTask.java:341)
	at com.sun.enterprise.web.connector.grizzly.DefaultReadTask.doTask(DefaultReadTask.java:263)
	at com.sun.enterprise.web.connector.grizzly.DefaultReadTask.doTask(DefaultReadTask.java:214)
	at com.sun.enterprise.web.portunif.PortUnificationPipeline$PUTask.doTask(PortUnificationPipeline.java:380)
	at com.sun.enterprise.web.connector.grizzly.TaskBase.run(TaskBase.java:265)
	at com.sun.enterprise.web.connector.grizzly.ssl.SSLWorkerThread.run(SSLWorkerThread.java:106)

voici la méthode ajouter de profil

Code:

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public String ajouter() {		 
		 loc=new SessionBeanRole() ;
	     profil.setRole(loc.RoleFindOnly(this.getIdrole())); 
		  profil.setStatutProfil("E");
		  profillocal.persistEntity(profil);
	      profil.setIdProfil(0);
 
	      return "ajouter";
	  }

Merci de m'aider