I wrote a datanucleus javaTypes plugin (for joda-time LocalDate) based
on the org.datanuclues.store.types.ObjectStringConverter interface.
You probably know that this interface allows non-basic types to
declare their ability to marshal themselves to/from a String
representation for persistence. In
I'm sorry to report that we have not yet hooked in support for
ObjectStringConverter. It shouldn't be too difficult though and I can
definitely see how it would be useful. Please file an issue and we'll get
to it as soon as we can.
http://code.google.com/p/datanucleus-appengine/issues/list
Than