problem with Dropdown List

[Mehmet.Kaplankiran]

Hello,

I have a problem with dropdown list.
Even if I select values in the Dropdown list (see picture below), the member 
variable docType is always null .
Unfortunately I have found no error. I hope you can see why this is.
Best regards, Mehmet



//################## class DocSearchPage ######################################
...
public class DocSearchPage extends MainTemplate
{
        private TDokar docType;
        ...
        public DocSearchPage()
        {
                add(getDocTypeDropDown("docType"));
                ...
                add(executeLink("execute"));
        }

        private TDokarDocTypeDropDownChoice getDocTypeDropDown(String id)
        {
                return new TDokarDocTypeDropDownChoice(id)
                {
                        @Override
                        protected List<TDokar> getTDokarList()
                        {
                                return getDocTypeList();
                        }

                        @Override
                        protected TDokar getTDokar()
                        {
                                return docType;
                        }

                        @Override
                        protected void setTDokar(TDokar dokart)
                        {
                                dokar = docType;
                        }
                };
        }

        private Link executeLink(String id)
        {
                return new Link(id)
                {
                        @Override
                        public void onClick()
                        {
                                disItemList = 
session().getUser().getUserDao().searchDIS(docType.getDokar(), ..);       
//docType is null
                        }
                };
        }

}

//######################## end DocSearchPage 
####################################



############################## class TDokarDocTypeDropDownChoice  #########
package de.t_systems.dks.eba.pages.docsearch;

import de.t_systems.dks.eba.beans.basedata.TDokar;
import org.apache.wicket.markup.html.form.DropDownChoice;
import org.apache.wicket.markup.html.form.IChoiceRenderer;
import org.apache.wicket.model.IModel;
import org.apache.wicket.model.Model;

import java.util.List;

public abstract class TDokarDocTypeDropDownChoice extends DropDownChoice
{

        public TDokarDocTypeDropDownChoice(String id)
        {
                super(id);
                setModel(model());
                setChoices(getTDokarList());
                setChoiceRenderer(RENDERER);
        }

        private IModel model()
        {
                return new Model()
                {
                        @Override
                        public Object getObject()
                        {
                                return getTDokar();
                        }

                        @Override
                        public void setObject(Object object)
                        {
                                setTDokar((TDokar) object);
                        }
                };
        }

        private static final IChoiceRenderer RENDERER = new IChoiceRenderer()
        {
                @Override
                public Object getDisplayValue(final Object object)
                {
                        TDokar dokar = (TDokar) object;
                        return dokar.getDokar();
                }

                @Override
                public String getIdValue(final Object object, final int index)
                {
                        return ((TDokar) object).getDokar();
                }
        };

        protected abstract TDokar getTDokar();
        protected abstract void setTDokar(TDokar tDokar);
        protected abstract List<TDokar> getTDokarList();
}


############################## TDokarDocTypeDropDownChoice  
#############''''''''''''''''''



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