I tried setting the model of a ListMultipleChoice to a HashSet (by using
a CompoundPropertyModel and the id of the HashSet). The list of possible
choices was an ArrayList. It shows my selected choices nicely. But I'm
getting an error when I want to save the data. So I'm guessing the LMC
doens't like cooperating with a HashSet, but then why does it allow the
HashSet to determine which values in the list to select? Or am I doing
something else wrong?
Here's the top of the stacktrace:
WicketMessage: Error calling method: public void
nl.lunaris.bookdb.model.database.User.setFriends(java.util.Set) on
object: User: Test
Root cause:
java.lang.IllegalArgumentException: argument type mismatch
Regards,
Linda
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