Stitch observe component applied over DB entities

[Name Surname]

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package rs.domaci.components;

import org.apache.tapestry5.PersistenceConstants;
import org.apache.tapestry5.annotations.Persist;
import org.apache.tapestry5.hibernate.annotations.CommitAfter;
import org.apache.tapestry5.ioc.annotations.Inject;
import com.entities.Ticket;
import com.services.logic.BizLogic;

import java.util.ArrayList;
import java.util.Date;
import java.util.List;

import org.apache.tapestry5.Block;
import org.apache.tapestry5.annotations.InjectComponent;
import org.apache.tapestry5.annotations.Property;
import org.apache.tapestry5.corelib.components.Zone;
import rs.domaci.entities.TypeOfTicket;

/**
 *
 * @author 
 */
public class ListTickets{

    @Inject
    private BizLogic businessLogic;
    @Property
    @Persist(PersistenceConstants.FLASH)
    private Ticket ticket;
    @Property
    @Persist(PersistenceConstants.FLASH)
    private List<Ticket> ticketss;
    @InjectComponent
    private Zone zonee;

    void setupRender() {
        ticketss= getTickets();
    }

    /**
     * This event is fired by the observe mixin
     */
    @CommitAfter
    @SuppressWarnings("unchecked")
    Block onFilter(String datumZaPromjenu, String tipDrawTiketa) {
        //Date parsedDatum = parseDate(datumZaPromjenu);
        List<Tiket> filtered = new ArrayList<Tiket>();
        for (Tiket tiketaa : tiketi) {
            //boolean include = datumZaPromjenu == null || 
phone.name.toLowerCase().contains(name.toLowerCase());
            boolean include = datumZaPromjenu == null || 
datumZaPromjenu.equals(tiketaa.getTicketDate());
            include &= tipDrawTiketa == null || 
tipDrawTiketa.equals(tiketaa.getTicketDrawTicket());
            if (include) {
                filtered.add(tiketaa);
            }
        }
        tiketi = filtered;
        return zonaZaTikete.getBody();
    }

    Date parseDate(String s) {
        try {
            return s == null ? null : new Date(s);
        } catch (NumberFormatException e) {
            // ignore invalid decimals
            return null;
        }
    }


    @CommitAfter
    @SuppressWarnings("unchecked")
    public List<Ticket> getTickets() {
        return businessLogic.listAllTickets();
    }
}



I am trying to run Stitch observe demo, however unsuccesfully.  The thing is 
that I would like to filter my list that is pulled from db by date and type of 
ticket params. How can I do so?