XML : Invalid persistence.xml

I'm a beginner with JPA and encounter some difficulties I don't have any idea how to solve them. While reading many forums, I see that a lot of people also have the same.

I work with : Eclipse Mars / H2 database / GlassFish 4 / Maven The project I created is a : Simple JPA project

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The error I got is :

Exception in thread "main" javax.persistence.PersistenceException: Invalid persistence.xml. Error parsing XML (line-1 : column -1): cvc-elt.1 : Déclaration de l'élément 'persistence' introuvable.

It is said that the declaration of the persistence object is unfindable.

But my Persistence.xml exists and is set in the META-INF root.

  <?xml version="1.0" encoding="UTF-8"?>  <persistence xmlns="http://xmlns.jcp.org/xml/ns/persistence"               xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"               xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/persistence http://xmlns.jcp.org/xml/ns/persistence/persistence_2_1.xsd"           version="2.1">      <persistence-unit name="CITIZEN2P0" transaction-type="RESOURCE_LOCAL">          <provider>org.hibernate.ejb.HibernatePersistence</provider>          <class>com.citizen.entities.User</class>          <class>com.citizen.entities.Groupe</class>          <class>com.citizen.entities.Organisation</class>          <class>com.citizen.entities.Message</class>          <class>com.citizen.entities.RoleUserInGroup</class>          <class>com.citizen.entities.Courrier</class>          <properties>              <property name="javax.persistence.jdbc.driver" value="org.h2.Driver"/>              <property name="javax.persistence.jdbc.url" value="jdbc:h2:~/test"/>              <property name="javax.persistence.jdbc.user" value="sa"/>              <property name="javax.persistence.schema-generation.database.action" value="drop-and-create"/>          </properties>      </persistence-unit>  </persistence>    

In order to use the persistence.xml, I have a class with an Entity Manager Factory :

  package com.citizen.run;    import javax.persistence.EntityManager;  import javax.persistence.EntityManagerFactory;  import javax.persistence.EntityTransaction;  import javax.persistence.Persistence;    import com.citizen.entities.User;    public class Test {          public static void main(String[]argv) {                  EntityManagerFactory emf = Persistence.createEntityManagerFactory("CITIZEN2P0");                  EntityManager em = emf.createEntityManager();                  EntityTransaction transac = em.getTransaction();              transac.begin();              User user = new User();              user.setNomUser("nom4");              user.setPrenomUser("prenom4");              em.persist(user);              transac.commit();                em.close();                  emf.close();              }        }    

I really don't know what to do !!

Thanx for any help.