non duplicated list

[julia]

Hello,

I have customer and customer type entity class. I used ManyToMany bi direction relationship. When I add new customer, I can add duplicated customer type. I don't want duplicated customer type in customer. Customer types are not duplicated for one customer.
I would like to know how can I do.

Thanks.

[phillipuniverse]

You will need to have a CustomPersistenceHandler which extends CustomPersistenceHandlerAdapter for the CustomerType entity. Override the canHandleFetch() and fetch() methods in this implementation and filter out the types that are already added for that customer.