j'ai un probleme dans l'ajout a travers mon formulaire
voila les erreurs qui s'affichent :
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org.hibernate.id.IdentifierGenerationException: ids for this class must be manually assigned before calling save(): com.stage.model.Langueparlee
	at org.hibernate.id.Assigned.generate(Assigned.java:52)
	at org.hibernate.event.internal.AbstractSaveEventListener.saveWithGeneratedId(AbstractSaveEventListener.java:118)
	at org.hibernate.event.internal.DefaultSaveOrUpdateEventListener.saveWithGeneratedOrRequestedId(DefaultSaveOrUpdateEventListener.java:204)
	at org.hibernate.event.internal.DefaultSaveEventListener.saveWithGeneratedOrRequestedId(DefaultSaveEventListener.java:55)
	at org.hibernate.event.internal.DefaultSaveOrUpdateEventListener.entityIsTransient(DefaultSaveOrUpdateEventListener.java:189)
	at org.hibernate.event.internal.DefaultSaveEventListener.performSaveOrUpdate(DefaultSaveEventListener.java:49)
	at org.hibernate.event.internal.DefaultSaveOrUpdateEventListener.onSaveOrUpdate(DefaultSaveOrUpdateEventListener.java:90)
	at org.hibernate.internal.SessionImpl.fireSave(SessionImpl.java:670)
	at org.hibernate.internal.SessionImpl.save(SessionImpl.java:662)
	at org.hibernate.internal.SessionImpl.save(SessionImpl.java:658)
	at com.stage.DAO.LangueparleeDAOImpl.addLangueparlee(LangueparleeDAOImpl.java:23)
	at com.stage.service.LangueparleeServiceImpl.addLangueparlee(LangueparleeServiceImpl.java:29)
	at com.stage.bean.LangueparleeBean.addLangueparlee(LangueparleeBean.java:155)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
	at java.lang.reflect.Method.invoke(Method.java:597)
	at org.apache.el.parser.AstValue.invoke(AstValue.java:262)
	at org.apache.el.MethodExpressionImpl.invoke(MethodExpressionImpl.java:278)
	at com.sun.faces.facelets.el.TagMethodExpression.invoke(TagMethodExpression.java:105)
	at javax.faces.component.MethodBindingMethodExpressionAdapter.invoke(MethodBindingMethodExpressionAdapter.java:87)
	at com.sun.faces.application.ActionListenerImpl.processAction(ActionListenerImpl.java:102)
	at org.springframework.faces.webflow.FlowActionListener.processAction(FlowActionListener.java:71)
	at org.springframework.faces.model.SelectionTrackingActionListener.processAction(SelectionTrackingActionListener.java:55)
	at javax.faces.component.UICommand.broadcast(UICommand.java:315)
	at javax.faces.component.UIViewRoot.broadcastEvents(UIViewRoot.java:790)
	at javax.faces.component.UIViewRoot.processApplication(UIViewRoot.java:1282)
	at com.sun.faces.lifecycle.InvokeApplicationPhase.execute(InvokeApplicationPhase.java:81)
	at com.sun.faces.lifecycle.Phase.doPhase(Phase.java:101)
	at com.sun.faces.lifecycle.LifecycleImpl.execute(LifecycleImpl.java:198)
	at javax.faces.webapp.FacesServlet.service(FacesServlet.java:646)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:305)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
	at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:224)
	at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:169)
	at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:472)
	at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:168)
	at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:98)
	at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:927)
	at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:118)
	at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:407)
	at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:987)
	at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:579)
	at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:309)
	at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
	at java.lang.Thread.run(Thread.java:619)
code du formulaire :
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<!-- langueparlee Add -->
		<h:form dir="ltr" id="langueparleeAddForm">
 
			<p:dialog header="Ajouter Langueparlee" widgetVar="langueparleeAdd"
				resizable="false" id="langueparleeAdd" showEffect="fade"
				hideEffect="explode" modal="true">
				<h:panelGrid columns="2" id="langueparleePanelAdd">
 
 
					<h:outputLabel value="libelle :" />
					<p:inputText id="libelle"
						value="#{LangueparleeBean.langueparlee.libelle}">
					</p:inputText>
 
 
					<f:facet name="footer">
						<p:spacer height="50px;"></p:spacer>
 
						<p:commandButton id="add" value="Ajouter"
							action="#{LangueparleeBean.addLangueparlee}" type="submit"
							update="langueparleeForm" ajax="true" />
						<p:commandButton value="Annuler" type="reset"
							oncomplete="langueparleeAdd.hide()" />
					</f:facet>
 
				</h:panelGrid>
			</p:dialog>
		</h:form>
classe java :
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@Entity
@Table(name = "LANGUEPARLEE")
public class Langueparlee implements java.io.Serializable {
	@Id
	@Column(name = "idlangueparlee")
	@GeneratedValue(strategy = GenerationType.AUTO)
	private BigDecimal idlangueparlee;
	private String libelle;
	private Set<Niveaulangueparlee> niveaulangueparlees = new HashSet<Niveaulangueparlee>(
			0);
 
	public Langueparlee() {
	}
 
	public Langueparlee(BigDecimal idlangueparlee) {
		this.idlangueparlee = idlangueparlee;
	}
 
	public Langueparlee(BigDecimal idlangueparlee, String libelle,
			Set<Niveaulangueparlee> niveaulangueparlees) {
		this.idlangueparlee = idlangueparlee;
		this.niveaulangueparlees = niveaulangueparlees;
 
	}
 
	@Id
	@Column(name = "IDLANGUEPARLEE", unique = true, nullable = false, precision = 22, scale = 0)
	public BigDecimal getIdlangueparlee() {
		return this.idlangueparlee;
	}
 
	public void setIdlangueparlee(BigDecimal idlangueparlee) {
		this.idlangueparlee = idlangueparlee;
	}
 
	public String getLibelle() {
		return libelle;
	}
 
	public void setLibelle(String libelle) {
		this.libelle = libelle;
	}
 
	@OneToMany(fetch = FetchType.LAZY, mappedBy = "langueparlee")
	public Set<Niveaulangueparlee> getNiveaulangueparlees() {
		return this.niveaulangueparlees;
	}
 
	public void setNiveaulangueparlees(
			Set<Niveaulangueparlee> niveaulangueparlees) {
		this.niveaulangueparlees = niveaulangueparlees;
	}
 
}
Pouvez vous m'aider svp et merci d'avance