hello,
please i just escuse me if my request is not very interesting...

i just want to show you something what i dont understand :
context : hibernate2.0, mySqL

i want ...to realize a many-to-many relation between two tables ...
"user" and "role"
(i try just like the doc example : work and author ...)

my problem was first :
i could add the first "role" in the user set. but i
couldnot add a second ...

so i test the method : set.contains() ..that show me that the set did not
want to add another "role" object (even if it's a different one ...)
i don't understand why...

after a little time now ...the problem is resolve..but i don't know why
...(object are add and are in my "user_role" mysql table ) but if i use
set.contains() it still says to me that the object is soon in the set...
a little disapointing think
and when i access to user.getRoles() it gives me only the first tuple of my user-role link....

should i post my code ??
perhaps i should not use a java.util.set ....

another think is that i can not use the <many-tomany> <column name=""...> format ..the parser says to me that column must have a "=" after it ...

thanks for every replies to my request....

It sounds like you may not be implementing equals() and hashCode() in the class stored in the Set. Also, you should post the relevant mappings if you have not resolved the problem.

From one newbie to another, properly implementing equals() and hashCode() is critical when working with Collections in Hibernate. That is one of the first things to check.

I had to also implement the Comparable interface for the objs stored in Set but right now can't remember why. You might want to think about this if hashCode & equals doesn't solve the problem.

Jeff

Jeff, you might need Comparable if it was a sorted set. Otherwise you don't need it.