Hi,

how can i write an annotation for the following case:
In my Entity Bean i have a oneToN mapping on itself.
How can i check if the entered value is existing in the database?


Example:
Folder A as Child exists with the field "Folder Parentfodler".

Action: I add Folder B as Parent.
How can i check if the parent Folder also exists in the Table "Folder" in the database?

Is there already an validation annotation for this case?
How would you check this?

Thx