Erro utilizando JPA

Exception in thread "main" javax.persistence.PersistenceException: No persistence providers available for "openjpa" after trying the following discovered implementations: NONE 
at javax.persistence.Persistence.createEntityManagerFactory(Persistence.java:182) 
at javax.persistence.Persistence.createEntityManagerFactory(Persistence.java:72) 
at com.swe.cliente.model.Teste.lista(Teste.java:19) 
at com.swe.cliente.model.Teste.main(Teste.java:14)

package com.swe.cliente.model; 

import java.util.List; 
import java.util.Properties; 

import javax.persistence.EntityManager; 
import javax.persistence.EntityManagerFactory; 
import javax.persistence.Persistence; 
import javax.persistence.Query; 

public class Teste { 

public static void main(String[] args){ 
lista(); 
} 

public static void lista(){ 
Properties props = new Properties(); 
EntityManagerFactory factory = Persistence.createEntityManagerFactory("openjpa"); 

EntityManager em = factory.createEntityManager(); 
em.getTransaction().begin(); 
Query query = em.createQuery("select codigo, nome from swe.clientes"); 
List results = query.getResultList(); 

for (Object res : results){ 
Clientes cliente = (Clientes)res; 
System.out.println(cliente.toString()); 
} 
em.close(); 

} 

}

<?xml version="1.0" encoding="UTF-8"?> 
<persistence version="1.0"> 
<persistence-unit name="openjpa"> 
<provider>org.apache.openjpa.persistence.PersistenceProviderImpl</provider> 
<class>com.swe.cliente.model.Clientes</class> 
<properties> 
<property name="openjpa.ConnectionURL" value="jdbc:mysql://localhost:3306/swe"/> 
<property name="openjpa.ConnectionDriverName" value="com.mysql.jdbc.Driver"/> 
<property name="openjpa.ConnectionUserName" value="root"/> 
<property name="openjpa.ConnectionPassword" value="october"/> 
<property name="openjpa.Log" value="DefaultLevel=WARN, Tool=INFO"/> 
</properties> 
</persistence-unit> 
</persistence>

package com.swe.cliente.model; 

import java.io.Serializable; 
import java.sql.Date; 

import javax.persistence.Column; 
import javax.persistence.Entity; 
import javax.persistence.GeneratedValue; 
import javax.persistence.Id; 

@Entity 
public class Clientes implements Serializable{ 

@Id @GeneratedValue 
@Column (name="codigo") 
private int codigo; 

@Column (name="nome") 
private String nome; 

@Column (name="dt_cadastro") 
private Date dataCadastro; 

public Clientes(){ 

} 

public Clientes(String nome){ 
this.nome = nome; 
this.dataCadastro = new Date(System.currentTimeMillis()); 
} 

public int getCodigo() { 
return codigo; 
} 

public void setCodigo(int codigo) { 
this.codigo = codigo; 
} 

public String getNome() { 
return nome; 
} 

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

public Date getDataCadastro() { 
return dataCadastro; 
} 

public void setDataCadastro(Date dataCadastro) { 
this.dataCadastro = dataCadastro; 
} 

@Override 
public String toString(){ 
return "Nome "+nome+" Data Cadastro "+dataCadastro.toString(); 
} 
}

<?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 http://java.sun.com/xml/ns/persistence/persistence_1_0.xsd">
	<persistence-unit name="test"
		transaction-type="RESOURCE_LOCAL">
		<class>br.blog.wbdsjunior.test.Person</class>
		<properties>
			<property name="openjpa.ConnectionURL"
				value="jdbc:derby://localhost:1527/../data/test" />
			<property name="openjpa.ConnectionDriverName"
				value="org.apache.derby.jdbc.ClientDriver" />
			<property name="openjpa.ConnectionUserName"
				value="test" />
			<property name="openjpa.ConnectionPassword"
				value="test" />
			<property name="openjpa.Log"
				value="DefaultLevel=WARN,Tool=INFO" />
		</properties>
	</persistence-unit>
</persistence>

package br.blog.wbdsjunior.test;

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

@Entity
public class Person implements Serializable {
	private static final long serialVersionUID = 1L;
	@Id
	@GeneratedValue(strategy = GenerationType.IDENTITY)
	private Long id;

	@Column(nullable = false)
	private String name;

	public Person() {
	}

	public Person(String name) {
		this.name = name;
	}

	public Long getId() {
		return this.id;
	}

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

	public String getName() {
		return this.name;
	}

	public void setName(String name) {
		this.name = name;
	}

	@Override
	public int hashCode() {
		final int prime = 31;
		int result = 1;
		result = prime * result + ((id == null) ? 0 : id.hashCode());
		return result;
	}

	@Override
	public boolean equals(Object obj) {
		if (this == obj) {
			return true;
		}

		if (obj == null) {
			return false;
		}

		if (getClass() != obj.getClass()) {
			return false;
		}
		Person other = (Person) obj;

		if (id == null) {
			if (other.id != null) {
				return false;
			}
		} else if (!id.equals(other.id)) {
			return false;
		}
		return true;
	}

	@Override
	public String toString() {
		return "Person[id=" + id + ",name=" + name + "]";
	}
}

package br.blog.wbdsjunior.test;

import javax.persistence.EntityManager;
import javax.persistence.EntityManagerFactory;
import javax.persistence.Persistence;

public class Test {
	public static void main(String[] args) {
		EntityManagerFactory emf = Persistence.createEntityManagerFactory("test");
		EntityManager em = emf.createEntityManager();
		em.getTransaction().begin();

//		Person p = new Person("Wilson");
//		em.persist(p);

		Person p = em.find(Person.class, 1l);
		System.out.println(p);

		em.getTransaction().commit();
		em.close();
		emf.close();
	}
}