Problem getting the collection objects in Toplinks using JDeveloper11g

Hi All
I am working the Toplinks in JDeveloper11g. I am using the Java Objects From Tables to create the Toplink map .
The problem is I am unable to work with the collection objects. I am getting the collection objects like addtocollection and removefromcollection. when I am dragging the collection object into the form and running the application it is giving errors.
Can any one help me out how to work with this collection objects.
Thanks in advance
Madhavi.

look at the java.util.SortedMap interface, and the classes that implement it. or, re-think your design. why do you want the entries sorted? do you really want that, or do you assume you do? is a Map the right collection here? I'm not saying it isn't, I'm just saying that the sorting requirement sounds like an assumption you need to challenge. generally, we get data out of a Map by explicitly asking for it by key

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