Auto Completar uma Jtable

Bem, estou quebrando a cabeça com o Hibernate.
estou tentando fazer de um jeito que quando a janela for aberta ele já preencha a tabela com os dados já existentes no banco.
mas... bem, vejam os códigos.

Onde deveria preencher:

private void formWindowOpened(java.awt.event.WindowEvent evt) {                                  
        jTextFieldId.setFocusable(false);
        jTextFieldId.setEditable(false);
        jTextFieldClienteNovo.setVisible(false);
        jTextFieldResponsavelNovo.setVisible(false);

        

        //Tabela Preenchida
        OrdemServicoDao<OrdemServico> osDao = new HibernateOrdemServicoDao();
        ResponsavelDao<Responsavel> respDao = new HibernateResponsavelDao();
        OrdemServico os = new OrdemServico();
      //Responsavel resp = new Responsavel();
        for(Integer i = 0; i < osDao.listar().size(); i++) {
        	for (Integer z = 0; z <respDao.listar().size(); z++) {
        os.setId(osDao.listar().get(i).getId());
        os.setResponsavel(osDao.listar().get(i).getResponsavel());
      //os.setResponsavel(respDao.listar().get(z));
        os.setCliente(osDao.listar().get(i).getCliente());
        os.setTeamViewerId(osDao.listar().get(i).getTeamViewerId());
        os.setAmmy(osDao.listar().get(i).getAmmy());
        os.setDescricao(osDao.listar().get(i).getDescricao());
        os.setData(osDao.listar().get(i).getData());
        os.setHora(osDao.listar().get(i).getHora());
        
        for(Integer x = 1; x < osDao.listar().size(); x++) {
        	for (Integer y = 1; y <osDao.listar().size(); y++) {
        		jTableOrdemServico.setValueAt(os.getId(), x, y);
        	}
        }
        
        }
        }
    
    }

Onde está o método está:

package br.gs.dao;

import java.lang.reflect.ParameterizedType;
import java.util.List;

public class HibernateGenericDao<T> implements DaoGenerico<T> {

	@Override
	public T inserir(T t) {
		HibernateUtil.getSessao().save(t);
		return t;		
	}

	@Override
	public T alterar(T t) {
		HibernateUtil.getSessao().update(t);
		return t;
	}

	@Override
	public T excluir(T t) {
		HibernateUtil.getSessao().delete(t);
		return t;
	}
	
	@SuppressWarnings("unchecked")
	@Override
	public List<T> listar() {
		return HibernateUtil.getSessao().createCriteria(getClassEntidade()).list();
	}
	
	@SuppressWarnings("unchecked")
	protected Class<T> getClassEntidade() {
		return (Class<T>) ((ParameterizedType) getClass().getGenericSuperclass()).getActualTypeArguments()[0];
	}

}

Classe OrdemServico:

package br.gs.domain;

import java.io.Serializable;
import java.util.Date;
import javax.persistence.*;

@Entity
@Table (name = "ordem_servico")
public class OrdemServico implements Serializable {	
	
	//Attributes
	
	/**
	 * 
	 */
	private static final long serialVersionUID = 1L;

	@Id
	@GeneratedValue (strategy = GenerationType.AUTO)
	private Long id;
	
	@Column (name = "cliente", nullable = false)
	private String cliente;
	
	@Column (name = "teamviewer_id")
	private String teamViewerId;

	@Column (name = "ammy")
	private String ammy;
	
	@Column (name = "descricao", nullable = false)
	private String descricao;
	
	@Column (name = "data", nullable = false)
    @Temporal(javax.persistence.TemporalType.DATE)
	private Date data;
	
	@Column (name = "hora", nullable = false)
	@Temporal(TemporalType.TIME)
	private Date hora;
	
	@ManyToOne
    @JoinColumn (name = "id_responsavel")
	private Responsavel responsavel;
	
	
	//Getters and Setters

	public Long getId() {
		return id;
	}

	public void setId(Long id) {
		this.id = id;
	}

	public String getTeamViewerId() {
		return teamViewerId;
	}

	public void setTeamViewerId(String teamViewerId) {
		this.teamViewerId = teamViewerId;
	}

	public String getAmmy() {
		return ammy;
	}

	public void setAmmy(String ammy) {
		this.ammy = ammy;
	}

	public String getDescricao() {
		return descricao;
	}

	public void setDescricao(String descricao) {
		this.descricao = descricao;
	}

	public Date getData() {
		return data;
	}

	public void setData(Date data) {
		this.data = data;
	}

    public Responsavel getResponsavel() {
        return responsavel;
    }

    public void setResponsavel(Responsavel responsavel) {
        this.responsavel = responsavel;
    }

	public String getCliente() {
		return cliente;
	}

	public void setCliente(String cliente) {
		this.cliente = cliente;
	}

	public Date getHora() {
		return hora;
	}

	public void setHora(Date hora) {
		this.hora = hora;
	}  
		
}

Classe Responsavel:

package br.gs.domain;

import java.io.Serializable;
import java.util.List;
import javax.persistence.*;

@Entity
@Table (name = "responsavel")
public class Responsavel implements Serializable {
	
	//Attributes
	
	private static final long serialVersionUID = 1L;

	@Id
	@GeneratedValue (strategy = GenerationType.AUTO)
	private Long id;
	
	@Column(name = "nome", nullable = false, unique = true)
	private String nome;
	
	@OneToMany(mappedBy="responsavel", fetch = FetchType.EAGER)
	List<OrdemServico> ordens;
	
	//Getters and Setters
	
	public Long getId() {
		return id;
	}

	public void setId(Long id) {
		this.id = id;
	}

	public String getNome() {
		return nome;
	}

	public void setNome(String nome) {
		this.nome = nome;
	}

    public List<OrdemServico> getOrdens() {
        return ordens;
    }

    public void setOrdens(List<OrdemServico> ordens) {
        this.ordens = ordens;
    }	

}

Hibernate.cfg:

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE hibernate-configuration PUBLIC "-//Hibernate/Hibernate Configuration DTD 3.0//EN" "http://hibernate.sourceforge.net/hibernate-configuration-3.0.dtd">
<hibernate-configuration>
  <session-factory>
    <property name="hibernate.dialect">org.hibernate.dialect.PostgreSQLDialect</property>
    <property name="hibernate.connection.driver_class">org.postgresql.Driver</property>
    <property name="hibernate.connection.url">jdbc:postgresql://localhost:5432/gs</property>
    <property name="hibernate.connection.username">gs</property>
    <property name="hibernate.connection.password">123456</property>
    <property name="hibernate.hbm2ddl.auto">update</property>
    <property name="hibernate.show_sql">true</property>
    <property name="hibernate.format_sql">true</property>
    
    <mapping class="br.gs.domain.OrdemServico"></mapping>
    <mapping class="br.gs.domain.Responsavel"></mapping>
  </session-factory>
</hibernate-configuration>

E o maldito Erro:

log4j:WARN No appenders could be found for logger (org.hibernate.cfg.annotations.Version).
log4j:WARN Please initialize the log4j system properly.
Exception in thread "AWT-EventQueue-0" java.lang.NullPointerException
	at br.gs.dao.HibernateGenericDao.listar(HibernateGenericDao.java:29)
	at br.gs.vision.Principal.formWindowOpened(Principal.java:392)
	at br.gs.vision.Principal.access$0(Principal.java:379)
	at br.gs.vision.Principal$1.windowOpened(Principal.java:88)
	at java.awt.AWTEventMulticaster.windowOpened(Unknown Source)
	at java.awt.Window.processWindowEvent(Unknown Source)
	at javax.swing.JFrame.processWindowEvent(Unknown Source)
	at java.awt.Window.processEvent(Unknown Source)
	at java.awt.Component.dispatchEventImpl(Unknown Source)
	at java.awt.Container.dispatchEventImpl(Unknown Source)
	at java.awt.Window.dispatchEventImpl(Unknown Source)
	at java.awt.Component.dispatchEvent(Unknown Source)
	at java.awt.EventQueue.dispatchEventImpl(Unknown Source)
	at java.awt.EventQueue.access$000(Unknown Source)
	at java.awt.EventQueue$3.run(Unknown Source)
	at java.awt.EventQueue$3.run(Unknown Source)
	at java.security.AccessController.doPrivileged(Native Method)
	at java.security.ProtectionDomain$1.doIntersectionPrivilege(Unknown Source)
	at java.security.ProtectionDomain$1.doIntersectionPrivilege(Unknown Source)
	at java.awt.EventQueue$4.run(Unknown Source)
	at java.awt.EventQueue$4.run(Unknown Source)
	at java.security.AccessController.doPrivileged(Native Method)
	at java.security.ProtectionDomain$1.doIntersectionPrivilege(Unknown Source)
	at java.awt.EventQueue.dispatchEvent(Unknown Source)
	at java.awt.EventDispatchThread.pumpOneEventForFilters(Unknown Source)
	at java.awt.EventDispatchThread.pumpEventsForFilter(Unknown Source)
	at java.awt.EventDispatchThread.pumpEventsForHierarchy(Unknown Source)
	at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
	at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
	at java.awt.EventDispatchThread.run(Unknown Source)

Se alguém puder me ajude...
obrigado.!

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