public Long save(BaseEntity instance) {
if (instance.getId() == null) {
em.persist(instance);
} else {
instance = em.merge(instance);
em.flush();
}
return instance.getId();
}
public void remove(BaseEntity instance) {
if (em.contains(instance)) {
em.remove(instance);
} else {
BaseEntity persistentInstance = em.find(instance.getClass(), instance.getId());
if (persistentInstance != null) {
em.remove(persistentInstance);
}
}
}