JPA – jpql query select optional general Dao selection

I have retrieved the category object according to a valid JPA example:

return (ArrayList<Category>) getEntityManager().createQuery("from Category").getResultList();

The query is very short - I can't find any optional and unavailable rules in the guide Is this simplicity acceptable?

Secondly, I want to implement it in a general Dao, for example:

public interface DAO<E,K>
{
    List<E> getAll();
}

How do I rewrite the first query to apply to all types because I can't hard code "from category"?

Solution

>Yes, brevity is acceptable Although I prefer complete syntax because it is more "attractive" to those who have more SQL experience

public List<E> getAll(Class<E> entityClass) {
     Query query = enittyManager.createQuery("from " + entityClass.getName());
     query.getResultList();
}