Erro : Derby - Persistência

Estou estudando percistência no netbeans e estou fazendo um pequeno exemplo, porém está me dando um erro… alguém poderia me dar uma ajuada??

/*

• Aluno.java
• Created on 10/10/2007, 14:05:32
• To change this template, choose Tools | Templates
• and open the template in the editor.
  */

package lib.database;

import java.io.Serializable;

import javax.persistence.Column;

import javax.persistence.Entity;

import javax.persistence.Id;

import javax.persistence.NamedQueries;

import javax.persistence.NamedQuery;

import javax.persistence.Table;

/**
*

• @author valdomiro
  
  */
  
  @Entity
  
  @Table(name = “ALUNO”)
  
  @NamedQueries({@NamedQuery(name = “Aluno.findById”, query = “SELECT a FROM Aluno a WHERE a.id = :id”), @NamedQuery(name = “Aluno.findByMatricula”, query = “SELECT a FROM Aluno a WHERE a.matricula = :matricula”), @NamedQuery(name = “Aluno.findByNome”, query = “SELECT a FROM Aluno a WHERE a.nome = :nome”)})
  
  public class Aluno implements Serializable {
  
  @Id
  
  @Column(name = “ID”, nullable = false)
  
  private Integer id;
  
  @Column(name = “MATRICULA”, nullable = false)
  
  private int matricula;
  
  @Column(name = “NOME”)
  
  private String nome;
  

  public Aluno() {
  }

  public Aluno(Integer id) {
  
  this.id = id;
  
  }
  

  public Aluno(Integer id, int matricula) {
  
  this.id = id;
  
  this.matricula = matricula;
  
  }
  

  public Integer getId() {
  
  return id;
  
  }
  

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

  public int getMatricula() {
  
  return matricula;
  
  }
  

  public void setMatricula(int matricula) {
  
  this.matricula = matricula;
  
  }
  

  public String getNome() {
  
  return nome;
  
  }
  

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

  <a class="mention" href="/u/override">@Override</a>
  
  public int hashCode() {
  
  int hash = 0;
  
  hash += (id != null ? id.hashCode() : 0);
  
  return hash;
  
  }
  

  <a class="mention" href="/u/override">@Override</a>
  
  public boolean equals(Object object) {
  
  // TODO: Warning - this method won’t work in the case the id fields are not set
  
  if (!(object instanceof Aluno)) {
  
  return false;
  
  }
  
  Aluno other = (Aluno) object;
  
  if ((this.id == null && other.id != null) || (this.id != null && !this.id.equals(other.id))) {
  
  return false;
  
  }
  
  return true;
  
  }
  

  <a class="mention" href="/u/override">@Override</a>
  
  public String toString() {
  
  return “lib.database.Aluno[id=” + id + “]”;
  
  }
  

}

/*

• TestaPersistencia.java
• Created on 10/10/2007, 14:07:37
• To change this template, choose Tools | Templates
• and open the template in the editor.
  */

package teste.lib;

import javax.persistence.EntityManager;

import javax.persistence.EntityManagerFactory;

import javax.persistence.EntityTransaction;

import lib.database.Aluno;

/**
*

• @author valdomiro
  */
  public class TestaPersistencia {
  public static void main (String args[]){
  javax.persistence.EntityManagerFactory emf = javax.persistence.Persistence.createEntityManagerFactory(“AlunoGUIPU”);
  javax.persistence.EntityManager em = emf.createEntityManager();
  em.getTransaction().begin();
  try {
  EntityTransaction tx = em.getTransaction();
  tx.begin();
  Aluno aluno = new Aluno();
  aluno.setId(3);
  aluno.setMatricula(45645);
  aluno.setNome(“Alex”);
  em.persist(aluno);
  tx.commit();
  } catch (Exception e) {
  e.printStackTrace();
  em.getTransaction().rollback();
  } finally {
  em.close();
  emf.close();
  }
  }

}

Erro:

Exception in thread “main” Local Exception Stack:

Exception [TOPLINK-4003] (Oracle TopLink Essentials - 2.0 (Build b58g-fcs (09/07/2007))): oracle.toplink.essentials.exceptions.DatabaseException

Exception Description: Configuration error.  Class [org.apache.derby.jdbc.ClientDriver] not found.

at oracle.toplink.essentials.exceptions.DatabaseException.configurationErrorClassNotFound(DatabaseException.java:101)

at oracle.toplink.essentials.sessions.DefaultConnector.loadDriver(DefaultConnector.java:183)

at oracle.toplink.essentials.sessions.DefaultConnector.connect(DefaultConnector.java:98)

at oracle.toplink.essentials.sessions.DatasourceLogin.connectToDatasource(DatasourceLogin.java:184)

at oracle.toplink.essentials.internal.sessions.DatabaseSessionImpl.loginAndDetectDatasource(DatabaseSessionImpl.java:582)

at oracle.toplink.essentials.ejb.cmp3.EntityManagerFactoryProvider.login(EntityManagerFactoryProvider.java:280)

at oracle.toplink.essentials.internal.ejb.cmp3.EntityManagerSetupImpl.deploy(EntityManagerSetupImpl.java:229)

at oracle.toplink.essentials.internal.ejb.cmp3.base.EntityManagerFactoryImpl.getServerSession(EntityManagerFactoryImpl.java:93)

at oracle.toplink.essentials.internal.ejb.cmp3.base.EntityManagerFactoryImpl.createEntityManagerImpl(EntityManagerFactoryImpl.java:126)

at oracle.toplink.essentials.internal.ejb.cmp3.base.EntityManagerFactoryImpl.createEntityManagerImpl(EntityManagerFactoryImpl.java:120)

at oracle.toplink.essentials.internal.ejb.cmp3.EntityManagerFactoryImpl.createEntityManager(EntityManagerFactoryImpl.java:91)

at teste.lib.TestaPersistencia.main(TestaPersistencia.java:25)