Document getter/setter not the same (collection vs List)

Hello,

I'm trying to compile a class which will become a web service, I'm using
Netbeans 5.5 and when i try to compile the following code:

"
    @WebMethod
    public Document getUserTrainingPlan(@WebParam(name="userId") String
userId) {
        
       UserPlan[] availableUserPlans =
AngelSelectQuery.doGetAvailbleUserPlans(userId);
            
       Document doc = new Document();
       Element plans = new Element("plans");
                       
       for  ( int i = 0; i < availableUserPlans.length; i++) {
          Element plan = new Element("plan").setAttribute("id",
availableUserPlans[i].getPlan().getPlanId());
          plan.addContent(new
Element("creationDate").setText(angel.webapp.utils.Date4Jsp.getDate(availableUserPlans[i].getPlan().getCreationDate())));
          plan.addContent(new
Element("name").setText(availableUserPlans[i].getPlan().getPlanName()));
          plan.addContent(new
Element("creator").setText(availableUserPlans[i].getPlan().getCreator().getGeneralInfo()));
          plan.addContent(new
Element("duration").setText(availableUserPlans[i].getPlan().getDuration()));
                plan.addContent(new
Element("avgSpeed").setText(availableUserPlans[i].getPlan().getAverageSpeed()));
                
          plans.addContent(plan);
            }
  
          doc.addContent(plans);
            
            // Debug
            try {
                XMLOutputter outp = new XMLOutputter();
                outp.output(doc, System.out);
            } catch (Exception e){
                System.out.println("Erreur xml: " + e.toString());
            }
        
        return doc;
        
    }
"

it gives me the following error:

"error: The type of the getter is java.util.List but that of the setter is
java.util.Collection. They have to be the same.
        this problem is related to the following location:
                at org.jdom.Document.getContent (Unknown Source)
                at org.jdom.Document (Unknown Source)
                at
angel.ws.jaxws.GetUserTrainingPlanResponse._return(GetUserTrainingPlanResponse.java:17)
                at
angel.ws.jaxws.GetUserTrainingPlanResponse(GetUserTrainingPlanResponse.java:14)
        this problem is related to the following location:
                at org.jdom.Document.setContent (Unknown Source)
                at org.jdom.Document (Unknown Source)
                at
angel.ws.jaxws.GetUserTrainingPlanResponse._return(GetUserTrainingPlanResponse.java:17)
                at
angel.ws.jaxws.GetUserTrainingPlanResponse(GetUserTrainingPlanResponse.java:14)
error: The type of the getter is java.util.List but that of the setter is
java.util.Collection. They have to be the same.
        this problem is related to the following location:
                at org.jdom.Element.getContent (Unknown Source)
                at org.jdom.Element (Unknown Source)
                at org.jdom.Document.getRootElement (Unknown Source)
                at org.jdom.Document (Unknown Source)
                at
angel.ws.jaxws.GetUserTrainingPlanResponse._return(GetUserTrainingPlanResponse.java:17)
                at
angel.ws.jaxws.GetUserTrainingPlanResponse(GetUserTrainingPlanResponse.java:14)
        this problem is related to the following location:
                at org.jdom.Element.setContent (Unknown Source)
                at org.jdom.Element (Unknown Source)
                at org.jdom.Document.getRootElement (Unknown Source)
                at org.jdom.Document (Unknown Source)
                at
angel.ws.jaxws.GetUserTrainingPlanResponse._return(GetUserTrainingPlanResponse.java:17)
                at
angel.ws.jaxws.GetUserTrainingPlanResponse(GetUserTrainingPlanResponse.java:14)
error: org.jdom.Namespace does not have a no-arg default constructor.
        this problem is related to the following location:
                at org.jdom.Namespace (Unknown Source)
                at org.jdom.Element.getNamespace (Unknown Source)
                at org.jdom.Element (Unknown Source)
                at org.jdom.Document.getRootElement (Unknown Source)
                at org.jdom.Document (Unknown Source)
                at
angel.ws.jaxws.GetUserTrainingPlanResponse._return(GetUserTrainingPlanResponse.java:17)
                at
angel.ws.jaxws.GetUserTrainingPlanResponse(GetUserTrainingPlanResponse.java:14)
3 errors
error: compilation failed, errors should have been reported
"

What should I do ? I wouldn't like to rewrite jdom ;)

Cheers,
Joel
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