Problème communication entre les agents

Bonjour
prière de m'indiquer ma faute dans le code suivant plus précisément dans la méthode afficher du agent ProvAg il n'envoi pas la liste au autre agent juste il l'affiche:
Code:
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import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
 
import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.parsers.ParserConfigurationException;
import javax.xml.xpath.XPath;
import javax.xml.xpath.XPathConstants;
import javax.xml.xpath.XPathExpressionException;
import javax.xml.xpath.XPathFactory;
 
import jade.core.AID;
import jade.core.Agent;
import jade.core.behaviours.FSMBehaviour;
import jade.core.behaviours.OneShotBehaviour;
import jade.lang.acl.ACLMessage;
 
 
import org.w3c.dom.Document;
import org.w3c.dom.NodeList;
import org.xml.sax.SAXException;
 
public class ProvAg extends Agent {
	boolean stop = false;
	protected void setup(){
		System.out.println("Agent "+getLocalName()+" started.");
 
        FSMBehaviour ProvAg_beh= new FSMBehaviour();
        ProvAg_beh.registerFirstState(new attendreService(), "attendreService");
	ProvAg_beh.registerState(new afficher(), "afficher");
	ProvAg_beh.registerState(new fin(), "fin");
	ProvAg_beh.registerTransition("attendreService", "afficher",0);
	ProvAg_beh.registerTransition("afficher", "fin",1);
        ProvAg_beh.registerDefaultTransition("afficher","attendreService");
	addBehaviour(ProvAg_beh);
	  }
	/****************************************************/
	private class attendreService extends OneShotBehaviour{
		public void action() {
			System.out.println(" La methode attendreService avait ete appele");
			ACLMessage message = new ACLMessage(ACLMessage.INFORM);
		    message.addReceiver(new AID("InvAg", AID.ISLOCALNAME));  
		        if(!stop){
		        message.setContent("pret");
		        send(message);
		        block();
		      }else{
		        message.setContent("arret");
		        send(message);  
		      }    
		    }
	}
	/***************************************************/
	private class afficher extends OneShotBehaviour{
	      String  service;
	      public void action() {
			  System.out.println(" La methode afficher avait ete commence ");
	    	  ACLMessage messageRecu = receive();
			  if (messageRecu != null) {
			  System.out.println("InvAg j'ai recu le service:"+messageRecu.getContent());
			  service=(messageRecu.getContent());
			  }
        try {
            FileInputStream file = new FileInputStream(new File("c:\\Code\\clouds.xml"));
 
            DocumentBuilderFactory builderFactory = DocumentBuilderFactory.newInstance();
 
            DocumentBuilder builder =  builderFactory.newDocumentBuilder();
 
            Document xmlDocument = builder.parse(file);
 
            XPath xPath =  XPathFactory.newInstance().newXPath();
 
            System.out.println("La liste des clouds offrant le service demande:");
            String expression = "/Clouds/cloud[machine/Service/@id=" + service + "]/@idCloud";
            NodeList nodeList = (NodeList) xPath.compile(expression).evaluate(xmlDocument, XPathConstants.NODESET);
            for (int i = 0; i < nodeList.getLength(); i++) {
                String L=nodeList.item(i).getFirstChild().getNodeValue();
            ACLMessage message = new ACLMessage(ACLMessage.INFORM);
            message.addReceiver(new AID("InvAg", AID.ISLOCALNAME));				    		
            message.setContent(L+"");
            send(message);
            System.out.println("InvAg je vous ai envoyé la liste");
            }
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        } catch (SAXException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        } catch (ParserConfigurationException e) {
            e.printStackTrace();
        } catch (XPathExpressionException e) {
            e.printStackTrace();
        }  
			block();
		}
 
	}
 
	/****************************************/
	private class fin extends OneShotBehaviour{
	    public void action() {
	      System.out.println("fin de l'agent");
	      myAgent.doDelete();
	    }  
	  }
	}