Problème avec JPA

Bonjour tout le monde ,je dispose d'une table dans ma BD oracle ,a laquelle je voudrais accéder pour cela j'ai généré mon entité depuis la table
voici mon code

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import java.io.Serializable;
import javax.persistence.*;
 
import java.math.BigDecimal;
 
 
/**
 * The persistent class for the BILAN database table.
 * 
 */
@Entity
 
@NamedQueries( {
	@NamedQuery(name = "bilan.findAll", query = "from Bilan") })
public class Bilan implements Serializable {
	private static final long serialVersionUID = 1L;
 
	@EmbeddedId
	private BilanPK id;
 
	@Column(name="DATE_MAJ")
	private BigDecimal dateMaj;
 
	@Column(name="DATE_PURGE")
	private BigDecimal datePurge;
 
	private BigDecimal entete;
 
	private String info;
 
    public Bilan() {
    }
 
	public BilanPK getId() {
		return this.id;
	}
 
	public void setId(BilanPK id) {
		this.id = id;
	}
 
	public BigDecimal getDateMaj() {
		return this.dateMaj;
	}
 
	public void setDateMaj(BigDecimal dateMaj) {
		this.dateMaj = dateMaj;
	}
 
	public BigDecimal getDatePurge() {
		return this.datePurge;
	}
 
	public void setDatePurge(BigDecimal datePurge) {
		this.datePurge = datePurge;
	}
 
	public BigDecimal getEntete() {
		return this.entete;
	}
 
	public void setEntete(BigDecimal entete) {
		this.entete = entete;
	}
 
	public String getInfo() {
		return this.info;
	}
 
	public void setInfo(String info) {
		this.info = info;
	}
 
}

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import java.io.Serializable;
import javax.persistence.*;
 
/**
 * The primary key class for the BILAN database table.
 * 
 */
@Embeddable
public class BilanPK implements Serializable {
	//default serial version id, required for serializable classes.
	private static final long serialVersionUID = 1L;
 
	@Column(name="TYPE_BILAN")
	private long typeBilan;
 
	@Column(name="DATE_BILAN")
	private long dateBilan;
 
	@Column(name="TYPE_TABLE")
	private long typeTable;
 
	@Column(name="ID_EEC")
	private long idEec;
 
    public BilanPK() {
    }
	public long getTypeBilan() {
		return this.typeBilan;
	}
	public void setTypeBilan(long typeBilan) {
		this.typeBilan = typeBilan;
	}
	public long getDateBilan() {
		return this.dateBilan;
	}
	public void setDateBilan(long dateBilan) {
		this.dateBilan = dateBilan;
	}
	public long getTypeTable() {
		return this.typeTable;
	}
	public void setTypeTable(long typeTable) {
		this.typeTable = typeTable;
	}
	public long getIdEec() {
		return this.idEec;
	}
	public void setIdEec(long idEec) {
		this.idEec = idEec;
	}
 
	public boolean equals(Object other) {
		if (this == other) {
			return true;
		}
		if (!(other instanceof BilanPK)) {
			return false;
		}
		BilanPK castOther = (BilanPK)other;
		return 
			(this.typeBilan == castOther.typeBilan)
			&& (this.dateBilan == castOther.dateBilan)
			&& (this.typeTable == castOther.typeTable)
			&& (this.idEec == castOther.idEec);
 
    }
 
	public int hashCode() {
		final int prime = 31;
		int hash = 17;
		hash = hash * prime + ((int) (this.typeBilan ^ (this.typeBilan >>> 32)));
		hash = hash * prime + ((int) (this.dateBilan ^ (this.dateBilan >>> 32)));
		hash = hash * prime + ((int) (this.typeTable ^ (this.typeTable >>> 32)));
		hash = hash * prime + ((int) (this.idEec ^ (this.idEec >>> 32)));
 
		return hash;
    }
}

ma class main :

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import java.util.Iterator;
import java.util.List;
 
import javax.persistence.EntityManager;
import javax.persistence.EntityManagerFactory;
import javax.persistence.Persistence;
import javax.persistence.Query;
 
import org.apache.log4j.Logger;
 
public class BilanService {
 
    // private static final String PERSISTENCE_UNIT = "supe";
 
	private static Logger logger = Logger.getLogger(BilanService.class);
 
	public static void main(String[] args) {
		// TODO Auto-generated method stub
 
 
 
 
 
 
 
 
		logger.debug("** getBilan called...");
 
		EntityManagerFactory entityManagerFactory = Persistence
				.createEntityManagerFactory("testJPA");
 
		EntityManager em = entityManagerFactory.createEntityManager();
 
		Query findAllQuery = em.createNamedQuery("bilan.findAll");
 
		List<Bilan> bilan = findAllQuery.getResultList();
 
		Iterator stIterator=bilan.iterator();
		while(stIterator.hasNext()){
		Bilan st=(Bilan)stIterator.next();
		System.out.print("id:"+st.getId());
		System.out.print(" date maj:"+st.getDateMaj());
		System.out.print(" date purge:"+st.getDatePurge());
 
		System.out.println();
 
		}
 
 
 
 
		if (bilan != null)
			logger.debug("** Found " + bilan.size() + " records:");
 
 
	}
 
 
 
}

mon fichier persistence.xml

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<?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="testJPA">
		<provider>org.hibernate.ejb.HibernatePersistence</provider>
 
 
	<class>Bilan</class>
		<class>BilanPK</class>
 
 
	<properties>
			<property name="hibernate.connection.driver_class" value="oracle.jdbc.OracleDriver" />
			<property name="hibernate.connection.url" value="dbc:oracle:thin:@192.160.123.22:1521:supe" />
			<property name="hibernate.connection.username" value="db_supe" />
			<property name="hibernate.connection.password" value="plasupe" />
			<property name="hibernate.dialect" value="org.hibernate.dialect.Oracle9Dialect" />
 
 
			<property name="hibernate.show_sql" value="true" />
			<property name="hibernate.use_sql_comments" value="false" />
 
		</properties>
 
 
 
 
	</persistence-unit>
</persistence>

quand j'execute mon main ,j'obtiens l'erreur suivante :

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log4j:WARN No appenders could be found for logger (BilanService).
log4j:WARN Please initialize the log4j system properly.
log4j:WARN See http://logging.apache.org/log4j/1.2/faq.html#noconfig for more info.
Exception in thread "main" java.lang.SecurityException: class "javax.persistence.PersistenceContextType"'s signer information does not match signer information of other classes in the same package
	at java.lang.ClassLoader.checkCerts(Unknown Source)
	at java.lang.ClassLoader.preDefineClass(Unknown Source)
	at java.lang.ClassLoader.defineClass(Unknown Source)
	at java.security.SecureClassLoader.defineClass(Unknown Source)
	at java.net.URLClassLoader.defineClass(Unknown Source)
	at java.net.URLClassLoader.access$000(Unknown Source)
	at java.net.URLClassLoader$1.run(Unknown Source)
	at java.security.AccessController.doPrivileged(Native Method)
	at java.net.URLClassLoader.findClass(Unknown Source)
	at java.lang.ClassLoader.loadClass(Unknown Source)
	at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source)
	at java.lang.ClassLoader.loadClass(Unknown Source)
	at java.lang.ClassLoader.loadClassInternal(Unknown Source)
	at org.hibernate.ejb.EntityManagerFactoryImpl.createEntityManager(EntityManagerFactoryImpl.java:39)
	at org.hibernate.ejb.EntityManagerFactoryImpl.createEntityManager(EntityManagerFactoryImpl.java:34)
	at BilanService.main(BilanService.java:34)

j'arrive pas a comprendre ce probleme !!
merci d'avance pour votre aide