You are not setting the value in the query.setParameter when trying to query the database

I have a problem when setting a value in query.setParameter . Using EcliseLink and MySQL, I made a query without setting parameters and it worked, what could it be?

Class where I try to query:

/*
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package br.com.redew.dao;

import br.com.redew.entidade.Funcionario;
import java.io.Serializable;
import javax.persistence.NoResultException;
import javax.persistence.NonUniqueResultException;
import javax.persistence.Query;

/**
 *
 * @author Desenvolvimento
 */
public class FuncionarioDao extends GenericoDao<Funcionario, Integer> implements Serializable {

    public Funcionario autenticar(Funcionario funcionario) throws NoResultException, NonUniqueResultException {
        Query query = getEm().createNamedQuery("Funcionario.autenticar");
        query.setParameter("email", funcionario.getEmail());
        query.setParameter("senha", funcionario.getSenha());
        return (Funcionario) query.getSingleResult();
    }
}

Generic Class:

/*
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 * and open the template in the editor.
 */
package br.com.redew.dao;

import java.io.Serializable;
import java.lang.reflect.ParameterizedType;
import java.util.List;
import javax.persistence.EntityManager;
import javax.persistence.EntityManagerFactory;
import javax.persistence.Persistence;
import javax.persistence.Query;

/**
 *
 * @author weder
 */
public class GenericoDao<T, ID> implements Serializable {

    private EntityManagerFactory emf;
    private EntityManager em;
    private Class<T> classe;

    public GenericoDao() {
        emf = Persistence.createEntityManagerFactory("br.com.redew_redew_war_1.0.0PU");
        em = emf.createEntityManager();
        classe = (Class<T>) ((ParameterizedType) getClass().getGenericSuperclass()).getActualTypeArguments()[0];
    }

    public T find(ID id) {
        return getEm().find(classe, id);
    }

    public Object insert(T Objeto) {
        getEm().getTransaction().begin();
        getEm().persist(Objeto);
        getEm().flush();
        getEm().getTransaction().commit();
        return Objeto;
    }

    public Object update(T Objeto) {
        getEm().getTransaction().begin();
        getEm().merge(Objeto);
        getEm().flush();
        getEm().getTransaction().commit();
        return Objeto;
    }

    public Object delete(T Objeto) {
        getEm().getTransaction().begin();
        getEm().remove(Objeto);
        getEm().flush();
        getEm().getTransaction().commit();
        return Objeto;
    }

    public List callNamedQuery(String namedQuery) {
        Query q = getEm().createNamedQuery(namedQuery);
        return q.getResultList();
    }

    public List callNativeNamedQuery(String query) {
        Query q = getEm().createNativeQuery(query);
        return q.getResultList();
    }

    public EntityManager getEm() {
        return em;
    }
}

Give this error:

  

Caused by: javax.persistence.PersistenceException: Exception [EclipseLink-4002]    (Eclipse Persistence Services - 2.6.1.v20150605-31e8258):    org.eclipse.persistence.exceptions.DatabaseException    Internal Exception:    com.mysql.jdbc.exceptions.jdbc4.MySQLNonTransientConnectionException: No    operations allowed after connection closed.    Error Code: 0    Call: SELECT id, email, name, password, phone, business_id FROM employee    WHERE ((email =?) AND (password =?))       bind = > [2 parameters bound]    Query: ReadAllQuery (name="Official.authenticate" referenceClass = Official    sql="SELECT id, email, name, password, phone, business_id FROM employee WHERE    ((email =?) AND (password =?))))