Modelo Tabela + Hibernate

package com.wordpress.aohana.gecon.geral.modelos;

import com.wordpress.aohana.gecon.cadastros.item.ItemDAO;
import com.wordpress.aohana.gecon.geral.base.BaseDAO;
import com.wordpress.aohana.gecon.geral.entidades.Item;
import java.util.List;
import javax.swing.table.AbstractTableModel;

/**
 *
 * @author Adriano Ohana
 */
public class ModeloTabelaItem extends AbstractTableModel {

    BaseDAO dao = new ItemDAO();
    List<Item> lista;
    String[] colunas = {"Cód.","Nome"};

    public ModeloTabelaItem() {
        this.lista = dao.findByAll("select idItem, nome from Item");
    }

    @Override
    public int getColumnCount() {
        return colunas.length;
    }

    @Override
    public int getRowCount() {
        return lista.size();
    }

    @Override
    public String getColumnName(int columnIndex) {
        return colunas[columnIndex];
    }

    @Override
    public Object getValueAt(int rowIndex, int columnIndex) {
        Item item = this.lista.get(rowIndex);

        if(columnIndex == 0)
            return item.getIdItem();
        else if(columnIndex == 1)
            return item.getNome();
        else
            return null;
    }

}

package com.wordpress.aohana.gecon.geral.base;

import java.util.List;
import javax.persistence.EntityManager;
import javax.persistence.EntityManagerFactory;
import javax.persistence.Persistence;

/**
 * Classe Abstrata que implementa os metodos de persistencia da aplicaçao,
 * recebendo a Entidade necessaria atraves de um generico <T>.
 *
 * @author Adriano Ohana
 * @since Abril 15, 2009
 */
public abstract class BaseDAO<T> implements IBaseDAO<T> {

    private EntityManagerFactory emf = Persistence.createEntityManagerFactory("GECONPU");
    private EntityManager em = emf.createEntityManager();

    public void persist(T entidade) {
        em.getTransaction().begin();
        try {
            em.persist(entidade);
            em.getTransaction().commit();
        } catch (Exception e) {
            e.printStackTrace();
            em.getTransaction().rollback();
        } finally {
            em.close();
        }
    }

    public List<T> findByAll(String query) {
        try {
            return em.createQuery(query).getResultList();
        } catch(Exception e) {
            e.printStackTrace();
            return null;
        }
    }

}

Exception in thread "AWT-EventQueue-0" java.lang.ClassCastException: [Ljava.lang.Object; cannot be cast to com.wordpress.aohana.gecon.geral.entidades.Item
        at com.wordpress.aohana.gecon.geral.modelos.ModeloTabelaItem.getValueAt(ModeloTabelaItem.java:40)
        at javax.swing.JTable.getValueAt(JTable.java:2695)
        at javax.swing.JTable.prepareRenderer(JTable.java:5712)
        at javax.swing.plaf.basic.BasicTableUI.paintCell(BasicTableUI.java:2075)
        at javax.swing.plaf.basic.BasicTableUI.paintCells(BasicTableUI.java:1977)
        at javax.swing.plaf.basic.BasicTableUI.paint(BasicTableUI.java:1773)
        at javax.swing.plaf.ComponentUI.update(ComponentUI.java:143)
        at javax.swing.JComponent.paintComponent(JComponent.java:763)
        at javax.swing.JComponent.paint(JComponent.java:1027)
        at javax.swing.JComponent.paintChildren(JComponent.java:864)
        at javax.swing.JComponent.paint(JComponent.java:1036)
        at javax.swing.JViewport.paint(JViewport.java:747)
        at javax.swing.JComponent.paintChildren(JComponent.java:864)
        at javax.swing.JComponent.paint(JComponent.java:1036)
        at javax.swing.JComponent.paintChildren(JComponent.java:864)
        at javax.swing.JComponent.paint(JComponent.java:1036)
        at javax.swing.JComponent.paintChildren(JComponent.java:864)
        at javax.swing.JComponent.paint(JComponent.java:1036)
        at javax.swing.JComponent.paintChildren(JComponent.java:864)
        at javax.swing.JComponent.paint(JComponent.java:1036)
        at javax.swing.JLayeredPane.paint(JLayeredPane.java:564)
        at javax.swing.JComponent.paintChildren(JComponent.java:864)
        at javax.swing.JComponent.paintToOffscreen(JComponent.java:5129)
        at javax.swing.BufferStrategyPaintManager.paint(BufferStrategyPaintManager.java:277)
        at javax.swing.RepaintManager.paint(RepaintManager.java:1217)
        at javax.swing.JComponent.paint(JComponent.java:1013)
        at java.awt.GraphicsCallback$PaintCallback.run(GraphicsCallback.java:21)
        at sun.awt.SunGraphicsCallback.runOneComponent(SunGraphicsCallback.java:60)
        at sun.awt.SunGraphicsCallback.runComponents(SunGraphicsCallback.java:97)
        at java.awt.Container.paint(Container.java:1762)
        at javax.swing.RepaintManager.paintDirtyRegions(RepaintManager.java:814)
        at javax.swing.RepaintManager.paintDirtyRegions(RepaintManager.java:714)
        at javax.swing.RepaintManager.seqPaintDirtyRegions(RepaintManager.java:694)
        at javax.swing.SystemEventQueueUtilities$ComponentWorkRequest.run(SystemEventQueueUtilities.java:128)
        at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:209)
        at java.awt.EventQueue.dispatchEvent(EventQueue.java:597)
        at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:269)
        at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:184)
        at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:174)
        at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:169)
        at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:161)
        at java.awt.EventDispatchThread.run(EventDispatchThread.java:122)