JPA com erro

Associado   
/*  
 * To change this template, choose Tools | Templates  
 * and open the template in the editor.  
 */  
package persistencia;   
  
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 Rafael Ferreira  
 */  
@Entity  
@Table(name = "associado")   
@NamedQueries({@NamedQuery(name = "Associado.findByAssCodigo",    
               query = "SELECT a FROM Associado a WHERE a.assCodigo = :assCodigo"),   
@NamedQuery(name = "Associado.findByAssNome",   
            query = "SELECT a FROM Associado a WHERE a.assNome = :assNome")   
})   
public class Associado implements Serializable {   
  
    private static final long serialVersionUID = 1L;   
    @Id  
    @Column(name = "ass_codigo", nullable = false)   
    private Integer assCodigo;   
    @Column(name = "ass_nome")   
    private String assNome;   
  
    public Associado() {   
    }   
    public Associado (Integer codigo, String nome){   
        setAssCodigo(codigo);   
        setAssNome(nome);   
    }   
  
    public Associado(Integer assCodigo) {   
        this.assCodigo = assCodigo;   
    }   
  
    public Integer getAssCodigo() {   
        return assCodigo;   
    }   
  
    public void setAssCodigo(Integer assCodigo) {   
        this.assCodigo = assCodigo;   
    }   
  
    public String getAssNome() {   
        return assNome;   
    }   
  
    public void setAssNome(String assNome) {   
        this.assNome = assNome;   
    }   
  
    @Override  
    public int hashCode() {   
        int hash = 0;   
        hash += (assCodigo != null ? assCodigo.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 Associado)) {   
            return false;   
        }   
        Associado other = (Associado) object;   
        if ((this.assCodigo == null && other.assCodigo != null) || (this.assCodigo != null && !this.assCodigo.equals(other.assCodigo))) {   
            return false;   
        }   
        return true;   
    }   
  
    @Override  
    public String toString() {   
        return "persistencia.Associado[assCodigo=" + assCodigo + "]";   
    }   
}  [/code

  
[code]package persistencia;   
  
import javax.persistence.EntityManager;   
import javax.persistence.EntityManagerFactory;   
import javax.persistence.EntityTransaction;   
import javax.persistence.Persistence;   
  
/**  
 *  
 * @author Administrador  
 */  
public class Main {   
  
    /**  
     * @param args the command line arguments  
     */  
    public static void main(String[] args) {   
        Associado associado = new Associado();   
        associado.setAssCodigo(new Integer(1));   
        associado.setAssNome("Teste");   
        salva(associado);    
           
       
    }   
       
  
    public static  void persist(Object object) {   
        EntityManagerFactory emf = javax.persistence.Persistence.createEntityManagerFactory("persistencia");   
        EntityManager em = emf.createEntityManager();   
        em.getTransaction().begin();   
        try {   
            em.persist(object);   
            em.getTransaction().commit();   
        } catch (Exception e) {   
            e.printStackTrace();   
            em.getTransaction().rollback();   
        } finally {   
            em.close();   
        }   
    }   
       
    public static void salva(Object object){   
           
        EntityManagerFactory emf = Persistence.createEntityManagerFactory("persistencia");   
        EntityManager em = emf.createEntityManager();   
        EntityTransaction tx = em.getTransaction();   
        tx.begin();   
        em.persist(object);   
        tx.commit();   
        em.close();   
           
           
           
    }   
  
}  
Main

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persistence   
  
<?xml version="1.0" encoding="UTF-8"?>   
<persistence version="1.0" xmlns="http://java.sun.com/xml/ns/persistence" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/persistence [url]http://java.sun.com/xml/ns/persistence/persistence_1_0.xsd">[/url]   
  <persistence-unit name="persistencia" >   
    <provider>oracle.toplink.essentials.PersistenceProvider</provider>   
    <class>persistencia.Associado</class>   
    <properties>   
      <property name="toplink.jdbc.user" value="postgres"/>   
      <property name="toplink.jdbc.password" value="postgres"/>   
      <property name="toplink.jdbc.url" value="jdbc:postgresql://localhost:5432/jpa"/>   
      <property name="toplink.jdbc.driver" value="org.postgresql.Driver"/>   
    </properties>   
  </persistence-unit>   
</persistence>  
persistence

<?xml version="1.0" encoding="UTF-8"?>
<persistence version="1.0" xmlns="http://java.sun.com/xml/ns/persistence" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/persistence [url]http://java.sun.com/xml/ns/persistence/persistence_1_0.xsd">[/url]
  <persistence-unit name="persistencia" >
    <provider>oracle.toplink.essentials.PersistenceProvider</provider>
    <class>persistencia.Associado</class>
    <properties>
      <property name="toplink.jdbc.user" value="postgres"/>
      <property name="toplink.jdbc.password" value="postgres"/>
      <property name="toplink.jdbc.url" value="jdbc:postgresql://localhost:5432/jpa"/>
      <property name="toplink.jdbc.driver" value="org.postgresql.Driver"/>
    </properties>
  </persistence-unit>
</persistence>