JSF EclipseLink-I can't write information to MySQL database

I am using JSF in a faculty subject and the professor passed an activity. But I am not being able to record information from a form. The connection is made, I can even perform queries in JPQL direct from Netbeans, but when I try to write information entered by a form the following error appears:

Javax.persistence.PersistenceException: Exception [EclipseLink-4002] (Eclipse Persistence Services-2.6.1.v20150605-31e8258): org.eclipse.persistence.exceptions.DatabaseException internal Exception: java.sql.SQLException: Error in allocating a connection. Cause: Connection could not be allocated because: java.lang.ClassCastException: java.math.BigInteger cannot be cast to java.lang.Long Error Code: 0

I am using Java connector V5.1.47. When I try to use a more updated connector I can not perform the connection to the database. Even with MySQL configured not to use encryption on root password. Because when I used it, the connection was not carried out because of this encryption.

Update

Here's my persistence.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="RestManagerPU" transaction-type="JTA">
    <jta-data-source>java:app/RestManager</jta-data-source>
    <exclude-unlisted-classes>false</exclude-unlisted-classes>
    <properties>
      <property name="javax.persistence.schema-generation.database.action" value="create"/>
    </properties>
  </persistence-unit>
</persistence>

And here is the DAOHelper, where the error occurs:

*
 * To change this license header, choose License Headers in Project Properties.
 * To change this template file, choose Tools | Templates
 * and open the template in the editor.
 */
package DAO;

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

/**
 *
 * @author leand
 */
public class DAOHelper {
    public EntityManager getEM(){
        EntityManagerFactory emf = Persistence.createEntityManagerFactory("RestManagerPU");
        return emf.createEntityManager();
    }
}

Error occurs on line:

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