Hibernate: 
    select
        entitya0_.ID as id1_0_,
        entitya0_.ENTITY_B as entity_b2_0_ 
    from
        ENTITY_A entitya0_ 
    inner join
        ENTITY_B entityb1_ 
            on entitya0_.ENTITY_B=entityb1_.ID 
    where
        0<(
            select
                count(*) 
            from
                REFERENCED_ENTITY referenced2_ 
            where
                referenced2_.foo=1 
                and referenced2_.ID=entityb1_.REF_NUMBER
        )