Criteria criteria = session.createCriteria(Enquiry.class)
 .createAlias("lecture", "l")
 .createAlias("l.admin", "a")
 .add( Restrictions.eqProperty("a.id", userId) );

Criteria criteria = session.createCriteria(Enquiry.class)
 .createAlias("lecture", "l")
 .add( Restrictions.eqProperty("l.admin.id", userId) );

Criteria crit = session.createCriteria(Enquiry.class)
crit.createAlias("lecture.admin", "lectureAdmin");
crit.add(Expression.eq("lectureAdmin.id", userId));