Erro em persistencia com Hibernate

import Lib.DataBase.ListaTarefa;

import Lib.GUI.TarefaTabela;

import javax.persistence.EntityManager;

import javax.persistence.EntityManagerFactory;

import javax.swing.JOptionPane;

/** Creates new form Main */
public Main() {
    initComponents();
}[/color]

listaTarefa.setId(identificadorTF.getText());
    listaTarefa.setTitulo(tituloTF.getText());
    listaTarefa.setReponsavel(reponsavelTF.getText());
    listaTarefa.setDescricao(descricaoTF.getText());
    
    persist(listaTarefa);
}[/color]

[color=darkblue]    private void AtualizaTabelaActionPerformed(java.awt.event.ActionEvent evt) {

tarefaTabela.setModel(new TarefaTabela());

}

public static void main(String args[]) {

java.awt.EventQueue.invokeLater(new Runnable() {

public void run() {

new Main().setVisible(true);

}

});

}

// Variables declaration - do not modify                     
private javax.swing.JButton AtualizaTabela;
private javax.swing.JButton adicionaJB;
private javax.swing.JPanel adicionarTarefa;
private javax.swing.JLabel descricaoJL;
private javax.swing.JTextField descricaoTF;
private javax.swing.JLabel identificadorJL;
private javax.swing.JTextField identificadorTF;
private javax.swing.JLabel jLabel1;
private javax.swing.JScrollPane jScrollPane1;
private javax.swing.JTabbedPane jTabbedPane1;
private javax.swing.JTextField reponsavelTF;
private javax.swing.JLabel responsavelJL;
private javax.swing.JTable tarefaTabela;
private javax.swing.JLabel tituloJL;
private javax.swing.JTextField tituloTF;
private javax.swing.JPanel visualizaTarefa;
// End of variables declaration                   

public void persist(Object object) {
    
    EntityManagerFactory emf = javax.persistence.Persistence.createEntityManagerFactory("ListaTarefaPU");
    EntityManager em = emf.createEntityManager();
    em.getTransaction().begin();
    try {
        em.persist(object);
        em.getTransaction().commit();
        JOptionPane.showMessageDialog(this,"Tarefa Adicionada.");
        
    } catch (Exception e) {
        e.printStackTrace();
        em.getTransaction().rollback();
    } finally {
        em.close();
    }
}

[color=darkred]@Entity

@Table(name = “LISTA_TAREFA”)

@NamedQueries({

@NamedQuery(name = “ListaTarefa.findById”, query = “SELECT l FROM ListaTarefa l WHERE <a href="http://l.id">l.id</a> = :id”),

@NamedQuery(name = “ListaTarefa.findByTitulo”, query = “SELECT l FROM ListaTarefa l WHERE l.titulo = :titulo”),

@NamedQuery(name = “ListaTarefa.findByReponsavel”, query = “SELECT l FROM ListaTarefa l WHERE l.reponsavel = :reponsavel”),

@NamedQuery(name = “ListaTarefa.findByDescricao”, query = “SELECT l FROM ListaTarefa l WHERE l.descricao = :descricao”)

})

public class ListaTarefa implements Serializable {

private static final long serialVersionUID = 1L;

@Id

@Column(name = “ID”, nullable = false)

private String id;

@Column(name = “TITULO”)

private String titulo;

@Column(name = “REPONSAVEL”)

private String reponsavel;

@Column(name = “DESCRICAO”)

private String descricao;[/color][b]