Java+jpa+hibernate

//Classe principal   
  
/*  
* To change this template, choose Tools | Templates  
* and open the template in the editor.  
*/   
  
package testejpa;   
  
import javax.persistence.*;   
  
/**  
*  
* @author Arquiris  
*/   
public class Main {   
  
    /**  
     * @param args the command line arguments  
     */   
    public static void main(String[] args) {   
           
         
           
       EntityManagerFactory factory;   
       EntityManager manager;   
         
       factory = Persistence.createEntityManagerFactory("testeJPAPU");   
       manager = factory.createEntityManager();   
       EntityTransaction tx = manager.getTransaction();   
         
       try {   
             
            tx.begin();   
               
            Fabricante fab = new Fabricante();   
       
            fab.setNmFabricante("Teste");   
         
           manager.persist(fab);   
           tx.commit();   
           System.out.println("Fabricante inserido com sucesso!");   
       }catch(Exception ex) {   
           tx.rollback();   
           System.out.println("Erro ao tentar inserir fabricante\nErro: " + ex.getMessage());   
       }   
    }   
  
}   
  
//Classe Fabricante   
  
/*  
* To change this template, choose Tools | Templates  
* and open the template in the editor.  
*/   
  
package testejpa;   
  
import java.io.Serializable;   
import java.util.Date;   
import javax.persistence.Column;   
import javax.persistence.Entity;   
import javax.persistence.GeneratedValue;   
import javax.persistence.GenerationType;   
import javax.persistence.Id;   
import javax.persistence.NamedQueries;   
import javax.persistence.NamedQuery;   
import javax.persistence.SequenceGenerator;   
import javax.persistence.Table;   
import javax.persistence.Temporal;   
import javax.persistence.TemporalType;   
  
/**  
*  
* @author Arquiris  
*/   
@Entity   
@Table(name = "FABRICANTE")   
@SequenceGenerator(name = "fabricante_seq", sequenceName = "seq_fabricante")     
@NamedQueries({@NamedQuery(name = "Fabricante.findByCdFabricante", query = "SELECT f FROM Fabricante f WHERE f.cdFabricante = :cdFabricante"), @NamedQuery(name = "Fabricante.findByNmFabricante", query = "SELECT f FROM Fabricante f WHERE f.nmFabricante = :nmFabricante"), @NamedQuery(name = "Fabricante.findByDtCadastro", query = "SELECT f FROM Fabricante f WHERE f.dtCadastro = :dtCadastro")})   
public class Fabricante implements Serializable {   
    private static final long serialVersionUID = 1L;   
    @Id   
    @GeneratedValue(strategy=GenerationType.AUTO, generator="fabricante_seq")   
    @Column(name = "CD_FABRICANTE", nullable = false)         
    private Integer cdFabricante;   
    @Column(name = "NM_FABRICANTE")   
    private String nmFabricante;   
    @Column(name = "DT_CADASTRO")   
    @Temporal(TemporalType.DATE)   
    private Date dtCadastro;   
  
    public Fabricante() {   
    }   
     
    public Fabricante(Integer cdFabricante) {   
        this.cdFabricante = cdFabricante;   
    }   
  
    public Integer getCdFabricante() {   
        return cdFabricante;   
    }   
  
    public void setCdFabricante(Integer cdFabricante) {   
        this.cdFabricante = cdFabricante;   
    }   
  
    public String getNmFabricante() {   
        return nmFabricante;   
    }   
  
    public void setNmFabricante(String nmFabricante) {   
        this.nmFabricante = nmFabricante;   
    }   
  
    public Date getDtCadastro() {   
        return dtCadastro;   
    }   
  
    public void setDtCadastro(Date dtCadastro) {   
        this.dtCadastro = dtCadastro;   
    }   
  
    @Override   
    public int hashCode() {   
        int hash = 0;   
        hash += (cdFabricante != null ? cdFabricante.hashCode() : 0);   
        return hash;   
    }   
  
    @Override   
    public boolean equals(Object object) {   
        // TODO: Warning - this method won't work in the case the id fields are not set   
        if (!(object instanceof Fabricante)) {   
            return false;   
        }   
        Fabricante other = (Fabricante) object;   
        if ((this.cdFabricante == null && other.cdFabricante != null) || (this.cdFabricante != null && !this.cdFabricante.equals(other.cdFabricante))) {   
            return false;   
        }   
        return true;   
    }   
  
    @Override   
    public String toString() {   
        return "testejpa.Fabricante[cdFabricante=" + cdFabricante + "]";   
    }   
  
}