Hi, I met this problem. Firt I must descrip my situation: I write two entity bean, one map for user table and one map for role table. One user could have many roles. So I build one to many relation ship between them. But when I use Users.getRoles() method, the collection returned is null. I have the two table on MSSQLServer, and several data in them. BTW, I use JBuilder7 to write the two beans.