When creating EntityManagerFactory with the Persistence unit the program stops JAVA

I have a problem with my web application that I am developing using JPA, which worked fine until yesterday.
With the help of Java DEBUG I have executed line by line and I noticed that the problem is sometimes in the EntityManagerFactory , and other times in the JPA controller of the entity when going through the method getEntityManager(). Al To say problem I mean that simply after executing that line of code does not advance to the next one, the program simply does not do anything.

I do not know why this happens. Here is my JPA controller, believe it with the assistant that brings netbeans.

The method I use is findEmpresaEntities()

public class UsuarioJpaController implements Serializable {

public UsuarioJpaController(UserTransaction utx, EntityManagerFactory emf) {
    this.utx = utx;
    this.emf = emf;
}
private UserTransaction utx = null;
private EntityManagerFactory emf = null;

public EntityManager getEntityManager() {

    return emf.createEntityManager();

}

public void create(Usuario usuario) throws RollbackFailureException, Exception {
    EntityManager em = null;
    try {
        utx.begin();
        em = getEntityManager();
        em.persist(usuario);
        utx.commit();
    } catch (Exception ex) {
        try {
            utx.rollback();
        } catch (Exception re) {
            throw new RollbackFailureException("An error occurred attempting to roll back the transaction.", re);
        }
        throw ex;
    } finally {
        if (em != null) {
            em.close();
        }
    }
}

public void edit(Usuario usuario) throws NonexistentEntityException, RollbackFailureException, Exception {
    EntityManager em = null;
    try {
        utx.begin();
        em = getEntityManager();
        usuario = em.merge(usuario);
        utx.commit();
    } catch (Exception ex) {
        try {
            utx.rollback();
        } catch (Exception re) {
            throw new RollbackFailureException("An error occurred attempting to roll back the transaction.", re);
        }
        String msg = ex.getLocalizedMessage();
        if (msg == null || msg.length() == 0) {
            Integer id = usuario.getIdusuario();
            if (findUsuario(id) == null) {
                throw new NonexistentEntityException("The usuario with id " + id + " no longer exists.");
            }
        }
        throw ex;
    } finally {
        if (em != null) {
            em.close();
        }
    }
}

public void destroy(Integer id) throws NonexistentEntityException, RollbackFailureException, Exception {
    EntityManager em = null;
    try {
        utx.begin();
        em = getEntityManager();
        Usuario usuario;
        try {
            usuario = em.getReference(Usuario.class, id);
            usuario.getIdusuario();
        } catch (EntityNotFoundException enfe) {
            throw new NonexistentEntityException("The usuario with id " + id + " no longer exists.", enfe);
        }
        em.remove(usuario);
        utx.commit();
    } catch (Exception ex) {
        try {
            utx.rollback();
        } catch (Exception re) {
            throw new RollbackFailureException("An error occurred attempting to roll back the transaction.", re);
        }
        throw ex;
    } finally {
        if (em != null) {
            em.close();
        }
    }
}

public List<Usuario> findUsuarioEntities() {
    return findUsuarioEntities(true, -1, -1);
}

public List<Usuario> findUsuarioEntities(int maxResults, int firstResult) {
    return findUsuarioEntities(false, maxResults, firstResult);
}

private List<Usuario> findUsuarioEntities(boolean all, int maxResults, int firstResult) {
    EntityManager em = getEntityManager();
    try {
        CriteriaQuery cq = em.getCriteriaBuilder().createQuery();
        cq.select(cq.from(Usuario.class));
        Query q = em.createQuery(cq);
        if (!all) {
            q.setMaxResults(maxResults);
            q.setFirstResult(firstResult);
        }
        return q.getResultList();
    } finally {
        em.close();
    }
}

public Usuario findUsuario(Integer id) {
    EntityManager em = getEntityManager();
    try {
        return em.find(Usuario.class, id);
    } finally {
        em.close();
    }
}

public int getUsuarioCount() {
    EntityManager em = getEntityManager();
    try {
        CriteriaQuery cq = em.getCriteriaBuilder().createQuery();
        Root<Usuario> rt = cq.from(Usuario.class);
        cq.select(em.getCriteriaBuilder().count(rt));
        Query q = em.createQuery(cq);
        return ((Long) q.getSingleResult()).intValue();
    } finally {
        em.close();
    }
}

}

This class is where I create the EMF

public class BusinessProcedure {

public static boolean validateUser(UsuarioTO miUsuario){

    boolean flag = false;

    EntityManagerFactory emf = Persistence.createEntityManagerFactory("ControlAdministrativoPU");

    UsuarioJpaController usuarioDAO = new UsuarioJpaController(null,emf);

    List<Usuario> lista = usuarioDAO.findUsuarioEntities();

    for (Usuario u :lista) {

                if(miUsuario.getRfc().equals(u.getRfc()) && miUsuario.getPass().equals(u.getPass()) && miUsuario.getUsuario().equals(u.getUsuario()) ) {flag = true; break;}
                else flag = false;

            }

    emf.close();

    return flag;

}

Here is Persitence.xml

<?xml version="1.0" encoding="UTF-8"?>
<persistence version="2.1" 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">
  <persistence-unit name="ControlAdministrativoPU" transaction-type="JTA">
    <jta-data-source>java:app/MySQLControl</jta-data-source>
        <exclude-unlisted-classes>false</exclude-unlisted-classes>
  </persistence-unit>
</persistence>

Someone will know how to solve this, some recommendations?

Thanks