public void addNewUser(String userId, String groupId, AbstractComponent mysandbox, AbstractComponent dropbox) {
String userDropboxesId = platform.getUserDropboxes().getComponentId();
EntityManager em = entityManagerFactory.createEntityManager();
try {
em.getTransaction().begin();
Disciplines group = em.find(Disciplines.class, groupId);
if (group == null) {
group = new Disciplines();
group.setDisciplineId(groupId);
em.persist(group);
}
MctUsers user = new MctUsers();
user.setUserId(userId);
user.setDisciplineId(group);