My query is something like this:

_CriteriaBuilder cb = = getEntityManager().getCriteriaBuilder();
CriteriaQuery<Table1> query = cb.createQuery(Table1.class);
Root<Table1> fr = query.from(Table1.class);
Fetch<Table1, Table2> ffc = fr.fetch(Table1_.table2s, JoinType.LEFT);
ffc.fetch(Table2_.table3s, JoinType.LEFT);
query.distinct(true);_

I'll send a test case.