hibernate和Java.util.set问题

i 'm trying the hibernate tutorials from their main site and wanted to change thing a bit to know how many to many relationship work with java.util.set interface.My mappings are correct and i can insert in and from the tables EVENT, PERSON and the mapping table PERSON_EVENT.Now i've inserted some dummy values in the tables and add their mappings in the mapping table.I wanted to display all the events of all the person who are register to an event or more. with this code :i 'm trying the hibernate tutorials from their