[Hibernate] many-to-many

There are 3 tables
=== Table1 ====
fooId
a

==== Table2 -====
barId
b

==== Table3 ==== (This table is joined from Table1 and Table2)
fooIdEx
barIdEx


===== a.java ===
....
private int foodId;
private String a;

private Set[b] bEnitty;
.......

===== b.java ======
......
private int barId;
private STring b;
............

===== a.hbm.xml (Mapping xml file) ======
.......





......

please refer to http://www.xylax.net/hibernate/manytomany.html