Generate Q-type from Class object in QueryDSL

Question

I have a method which returns the Class object of entity I want to query:

protected abstract Class<T> getEntityClass();

and later I would like to query this entity with QueryDSL

new JPAQuery<>(em).from(?????);

how can I achieve this?

Answer 1

I've just found out I can use PathBuilder:

PathBuilder<Person> pathBuilder = new PathBuilder(Person.class, "PERSON");

List<Person> fetch = new JPAQuery<Person>(em)
                .from(pathBuilder)
                .fetch();