Pb avec la récupération de la ligne selection

BJR à tous,
je travaille avec eclipse europa, hibernate2 et jsf. Oracle comme SGBD

En fait j'arrive pas é récupérer la ligne selectionnée dans un composant <h:datatable>:


page1.jsp

<h:dataTable  border="1" width="885" cellspacing="1" rules="all" value="#{programme.listToDataModel}" var="prg"  >
	<h:column>
	<f:facet name="header" >
	<h:outputText value="Num" />
	</f:facet>
	<h:outputText value="#{programme.num}"/>
	</h:column>
	<h:column>
	<f:facet name="header">
	<h:outputText value="Réf" />
	</f:facet>
	<h:outputText value="#{prg.idProgramme}" />
	</h:column>
	<h:column>
	<f:facet name="header">
	<h:outputText value="Désignation" />
         </f:facet>
        <h:outputText value="#{prg.designationProgramme}" />
	</h:column>
	<h:column>
	<f:facet name="header">
	<h:outputText value="Objet" />
	</f:facet>
	<h:outputText value="#{prg.objetProgramme}" />
	</h:column>
	<h:column>
	<f:facet name="header">
	<h:outputText value="Montant" />
	</f:facet>
	<h:outputText value="#{prg.montantProgramme}" />
	</h:column>
	<h:column>
	<f:facet name="header">
	<h:outputText value="Docs" />
	</f:facet>
	<h:commandLink hreflang="ges_docs_details.jsf"  action="#{documentsprogramme.getSelectedRow}" >
	<img src="images/navbits_finallink.gif" height="18" border="0" />
	</h:commandLink>
 	</h:column>
<:H:datatable>

page1 doit renvoyer vers ---> page2.jsp

documentsprogramme.java

	private List<Documents> ListeDocProg;
	private DataModel dataModel;
	private Programme o;

	public List<Documents> getListeDocumentsProg(Integer IdProgramme ){
		
		try { 
		      Session session = HibernateUtil.currentSession(); 
		      
		      ListeDocProg= new ArrayList<Documents>();
		      List list = session.find("from DocumentsProgramme where id_programme="+IdProgramme); 
		      Iterator it = list.iterator(); 
		      
		      while(it.hasNext()) { 
		    	  Documents doc = (Documents)it.next(); 
		    	  ListeDocProg.add(doc);				        
		      } 
		      
		      HibernateUtil.closeSession(); 
		 } catch (HibernateException e) { 
		      e.printStackTrace(); 
		 }  
		 return ListeDocProg;
	}

	public Object getRowData(){
         return dataModel.getRowData();
     }
	
	public String getSelectedRow(){
		
		try {   
			o = new Programme();
			o =(Programme) dataModel.getRowData();
			int index = dataModel.getRowIndex();

			//Programme p=new Programme();
			System.out.print("hiiiiiii"+o.getIdProgramme());

		}catch (Exception npe) {            
			//this.o = new Programme();
			npe.printStackTrace();
		}    

		return "ok";
	}

Programme.java

	public List<Programme> getListeProgrammes(){
		
		
		/*~~lecture de la liste des programmes existants à partir de la table Programe ~~*/
		try { 
		      Session session = HibernateUtil.currentSession(); 
		      
		      ListeProgrammes= new ArrayList<Programme>();
		      List list = session.find("from Programme"); 
		      Iterator it = list.iterator(); 
		      
		      while(it.hasNext()) { 
		    	  Programme prg = (Programme)it.next(); 
		    	  ListeProgrammes.add(prg);				        
		      } 
		      
		      HibernateUtil.closeSession(); 
		 } catch (HibernateException e) { 
		      e.printStackTrace(); 
		 }  
		 return ListeProgrammes;
	}

	public DataModel getListToDataModel(){
		
		if (dataModel == null)
			dataModel= new ListDataModel();

		ListeProgrammes=getListeProgrammes();
		dataModel.setWrappedData(ListeProgrammes);
		return dataModel;
	}

	public int getNum() {
		Num++;
		return Num;
	}

La liste des programme s'affiche, mais qd je clique sur la commandLink, j'ai pas le print dans la console, et de plus, j'ai un message d'erreur:

java.lang.NullPointerException
	at com.safaqat.hibernate.Documentsprogramme.getSelectedRow(Documentsprogramme.java:69)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
	at java.lang.reflect.Method.invoke(Unknown Source)
	at org.apache.el.parser.AstValue.invoke(AstValue.java:152)
	at org.apache.el.MethodExpressionImpl.invoke(MethodExpressionImpl.java:276)
	at org.apache.jasper.el.JspMethodExpression.invoke(JspMethodExpression.java:68)
	at javax.faces.component.MethodBindingMethodExpressionAdapter.invoke(MethodBindingMethodExpressionAdapter.java:88)
	at com.sun.faces.application.ActionListenerImpl.processAction(ActionListenerImpl.java:102)
	at javax.faces.component.UICommand.broadcast(UICommand.java:387)
	at javax.faces.component.UIData.broadcast(UIData.java:926)
	at javax.faces.component.UIViewRoot.broadcastEvents(UIViewRoot.java:458)
	at javax.faces.component.UIViewRoot.processApplication(UIViewRoot.java:763)
	at com.sun.faces.lifecycle.InvokeApplicationPhase.execute(InvokeApplicationPhase.java:82)
	at com.sun.faces.lifecycle.Phase.doPhase(Phase.java:100)
	at com.sun.faces.lifecycle.LifecycleImpl.execute(LifecycleImpl.java:118)
	at javax.faces.webapp.FacesServlet.service(FacesServlet.java:265)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
	at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:233)
	at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:175)
	at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:128)
	at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)
	at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
	at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:286)
	at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:844)
	at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:583)
	at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:447)
	at java.lang.Thread.run(Unknown Source)

ca fait plus d'une semaine que je suis bloquée sur ce pb, merci d'avance