Unknown Entity bean class after hot-deploy

Vaadin 6 / 7 / 8
1

Every time that I do redeploy (on Netbeans) Eclipselink stops working. I have to restart Glass to make it work again.

ava.lang.IllegalArgumentException: Unknown Entity bean class: class com.traslado.modelo.Usuario, please verify that this class has been marked with the @Entity annotation.

There is an old reply to this in Stackoverflow:
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The issue is the old persistence unit with references to the old classes is remaining after your redeploy. Ensure the old EntityManagerFactory is getting closed. Glassfish should handle this for any managed factories such as in a SessionBean, but if you are managing your own factories you need to ensure these are closed.

but I couldn’t figure it out

persistence.xml

<?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="trasladoPU" transaction-type="RESOURCE_LOCAL">
        <provider>org.eclipse.persistence.jpa.PersistenceProvider</provider>
        <non-jta-data-source>trasladoDataPU</non-jta-data-source>
        <exclude-unlisted-classes>false</exclude-unlisted-classes>
        <properties>
            <property name="javax.persistence.schema-generation.database.action" value="drop-and-create"/>
        </properties>
    </persistence-unit>
</persistence>

This is how I retrieve an EntityManager

    public EntityManager getEntityManager() {
        //return JPAContainerFactory.createEntityManagerForPersistenceUnit("trasladoPU");
        HashMap properties = new HashMap();
        properties.put(PersistenceUnitProperties.CLASSLOADER, getClass().getClassLoader());
        emf = Persistence.createEntityManagerFactory("trasladoPU", properties);
        return emf.createEntityManager();
    }

No matter if I close the EMF after each EntityManager, the error is throws after every hot deploy