hello,
I ask me a question. as I have a list of tasks (the new ones and the old ones) when I execute this lines:
Iterator itr1 = taskinstances.iterator();
 System.out.println("iterator ok");
 while(itr1.hasNext()) {
 System.out.println("creation taskinstance");
 taskinstance=(TaskInstance)itr1.next();
 // taskinstance = processInstance.getTaskMgmtInstance().createTaskInstance();
 taskinstance.isSignalling();
 if("ernie"==taskinstance.getActorId()){
 System.out.println("TASK ERNIE ARE:.ERNIE................:"+taskinstance.getName());
 }
 else if("bert"==taskinstance.getActorId()){
 System.out.println("task BERT ARE:.BERT....................:"+taskinstance.getName());
 }
 else{
 System.out.println("THE TASK ARE NOT ALLOWED TO YOUR USER .. the task is :"+taskinstance.getName()+" to the user "+taskinstance.getActorId());
 taskinstance.getSwimlaneInstance().setActorId("bert");
 System.out.println("Changement effectué.. the task is :"+taskinstance.getName()+" to the user "+taskinstance.getActorId());
 }I think that perhaps I create a new swimlane each time. 
So I will put my file code in order to see you if you see why I have the task already signal and the new one. 
thank you for you help in advance 
antitrust 1982 
my code: 
(this is a java file which is executed when I pass from a jsp to an another one) 
package com.opensymphony.webwork.portlet.tutorial;
import java.util.Collection;
import java.util.Iterator;
import java.util.Map;
import java.util.Date;
import java.util.Set;
import org.jbpm.db.JbpmSession;
import org.jbpm.db.JbpmSessionFactory;
import org.jbpm.graph.exe.*;
import org.jbpm.taskmgmt.def.*;
import org.jbpm.graph.def.ProcessDefinition;
import org.jbpm.graph.exe.ExecutionContext;
import org.jbpm.graph.exe.ProcessInstance;
import org.jbpm.graph.exe.Token;
import org.jbpm.taskmgmt.exe.Assignable;
import org.jbpm.taskmgmt.exe.PooledActor;
import org.jbpm.taskmgmt.exe.SwimlaneInstance;
import org.jbpm.taskmgmt.exe.TaskInstance;
import org.jbpm.taskmgmt.exe.TaskMgmtInstance;
import org.jbpm.taskmgmt.log.SwimlaneLog;
import javax.naming.InitialContext;
import org.hibernate.SessionFactory;
import com.opensymphony.xwork.ActionContext;
import com.opensymphony.xwork.ActionSupport;
import org.jbpm.*;
import org.jbpm.identity.hibernate.IdentitySession;
import javax.rmi.PortableRemoteObject;
public class Renseignement extends ActionSupport{
 private String currentNode;
 private String date;
 private String societe;
 private String redacteur;
 private String tdemand;
 ExecutionContext ec=null;
 static JbpmConfiguration jbpmConfiguration = null;
 static ProcessDefinition processDefinition= null;
 JbpmContext jbpmContext=null;
 TaskInstance taskinstance=null;
 Token token=null;
 public void setCurrentNode(String currentNode) {
 System.out.println("set currentNode");
 this.currentNode = currentNode;
 }
 public String getCurrentNode() {
 System.out.println("get currentNode");
 return currentNode;
 }
 public void setDate(String date) {
 this.date = date;
 }
 public String getDate() {
 return date;
 }
 public void setSociete(String societe) {
 this.societe = societe;
 }
 public String getSociete() {
 return societe;
 }
 public void setRedacteur(String redacteur) {
 this.redacteur = redacteur;
 }
 public String getRedacteur() {
 return redacteur;
 }
 public void setTdemand(String tdemand) {
 this.tdemand = tdemand;
 }
 public String getTdemand() {
 return tdemand;
 }
 @Override
 public String execute() throws Exception {
 ProcessInstance processInstance = null;
 Map session = (Map) ActionContext.getContext().get("session");
 JbpmContext jbpmContext1= (JbpmContext) session.get("jbpmContext");
 processInstance=(ProcessInstance) session.get("process");
 System.out.println("actorid: "+jbpmContext1.getActorId());
 System.out.println("processdefiniton from session");
 ProcessDefinition pd = (ProcessDefinition)session.get("processDefiniton");
 System.out.println("ok");
 SwimlaneInstance si= (SwimlaneInstance)session.get("si");
 System.out.println( si.getName());
 System.out.println("avant la création du collection");
 System.out.println("NOM DU SWIMLANE : "+si.getName());
 Collection taskinstances = (Collection) si.getTaskMgmtInstance().getTaskInstances();
 System.out.println("ca fonctionne le MAP");
 Iterator itr1 = taskinstances.iterator();
 System.out.println("iterator ok");
 while(itr1.hasNext()) {
 System.out.println("creation taskinstance");
 taskinstance=(TaskInstance)itr1.next();
 taskinstance.isSignalling();
 if("ernie"==taskinstance.getActorId()){
 System.out.println("TASK ERNIE ARE:.ERNIE................:"+taskinstance.getName());
 }
 else if("bert"==taskinstance.getActorId()){
 System.out.println("task BERT ARE:.BERT....................:"+taskinstance.getName());
 }
 else{
 System.out.println("THE TASK ARE NOT ALLOWED TO YOUR USER .. the task is :"+taskinstance.getName()+" to the user "+taskinstance.getActorId());
 taskinstance.getSwimlaneInstance().setActorId("bert");
 System.out.println("Changement effectué.. the task is :"+taskinstance.getName()+" to the user "+taskinstance.getActorId());
 }
 }
 try{
 token = taskinstance.getToken();
 token.signal();
 token.signal();
 }
 finally{
 }
 System.out.println("############## save token good#######");
 // jbpmContext.save(processInstance);
 System.out.println("############## save process good#######");
 System.out.println("USER .........................."+jbpmContext1.getActorId());
 this.setCurrentNode(currentNode);
 Date date1 = new Date();
 this.setDate(date1.toGMTString());
 //session.put("tdemand",this.getTdemand());
 //session.put("societe",this.getSociete());
 //session.put("date",this.getDate());
 //session.put("redateur", this.getRedacteur());
 // session.put("processName",nameProcess);
 //session.put("processDefiniton",processDefinition);
 session.put("ec",ec);
 session.put("si",si);
 session.put("process",processInstance);
 //session.put("jbpmContext",jbpmContext);
 return SUCCESS;
 }
}
It appear in my console these lines: 
actorid: ernie
processdefiniton from session
ok
FONCIA
avant la cr?®ation du collection
NOM DU SWIMLANE : FONCIA
ca fonctionne le MAP
iterator ok
creation taskinstance
task BERT ARE:.BERT....................:DeclarationSinistre
creation taskinstance
task BERT ARE:.BERT....................:ControlePrime
creation taskinstance
TASK ERNIE ARE:.ERNIE................:start
creation taskinstance
TASK ERNIE ARE:.ERNIE................:EnregistrementSinistre
############## save token good#######
############## save process good#######
USER ..........................ernie
set currentNode
#### execute
firstNAmle : null
get currentNode