JPA 2 + Criteria API - Defining a subquery

I try to convert a sql query to Criteria API without success so far. I can create two separate queries which return the values I need, but I don't know how to combine them in a single query.

Here is the sql statement which works:

select company.*, ticketcount.counter from company

    join 

(select company, COUNT(*) as counter from ticket where state<16 group by company) ticketcount

on company.compid = ticketcount.company;

This Criteria query returns the inner query results:

CriteriaBuilder cb = em.getCriteriaBuilder();

CriteriaQuery<intCompany> qTicket = cb.createQuery(intCompany.class);

Root<Ticket> from = qTicket.from(Ticket.class);

Path groupBy = from.get("company");        

Predicate state = cb.notEqual(from.<State>get("state"), getStateById(16));        

qTicket.select(cb.construct(

    intCompany.class, cb.count(from),from.<Company>get("company")))

        .where(state).groupBy(groupBy);                

em.createQuery(qTicket).getResultList();

In the application I defined a small wrapper/helper class:

public  class intCompany{

    public Company comp;

    public Long opentickets;

    public intCompany(Long opentickets,Company comp){

        this.comp = comp;

        this.opentickets = opentickets;

    }

    public intCompany(){



    }

}

So does anyone has an idea how to get this working?