public static VersionsReader get(Session session) throws VersionsException 
{
        SessionImplementor sessionImpl = (SessionImplementor) session;
        EventListeners listeners = sessionImpl.getListeners();
        for (PostInsertEventListener listener : listeners.getPostInsertEventListeners()) {
            if (listener instanceof AuditEventListener) {
                if (arrayIncludesInstanceOf(listeners.getPostUpdateEventListeners(), AuditEventListener.class) &&
                        arrayIncludesInstanceOf(listeners.getPostDeleteEventListeners(), AuditEventListener.class)) {
                    return new AuditReaderImpl(((AuditEventListener) listener).getVerCfg(), session,
                            sessionImpl);
                }
            }
        }
        throw new VersionsException("You need install the org.hibernate.envers.event.VersionsEventListener " +
                "class as post insert, update and delete event listener.");
}

Create a versions reader associated with an open session. WARNING: Using Envers with Hibernate (not with Hibernate Entity Manager/JPA) is experimental, if possible, use VersionsReaderFactory#get(javax.persistence.EntityManager) .

 public static VersionsReader get(EntityManager entityManager) throws VersionsException 
{
        if (entityManager.getDelegate() instanceof Session) {
            return get((Session) entityManager.getDelegate());
        }
        if (entityManager.getDelegate() instanceof EntityManager) {
            if (entityManager.getDelegate() instanceof Session) {
                return get((Session) entityManager.getDelegate());
            }
        }
        throw new VersionsException("Hibernate EntityManager not present!");
}

Create a versions reader associated with an open entity manager.