Yes, this is datanucleus-appengine issue 80 (Recursive relation does
not work). I have starred this issue, along with 29 others.

I could not wait for the fix, so I have already worked around this
issue by having all my entities of this type:
  ·  having the same entity group parent (of a different class)
  ·  using an ArrayList<[Entity]> of key values to store each entity's
"children"
  ·  using a key value to store each entity's "parent" (null for the
root instance, even though it still has a entity group parent).

This is not ideal for me, but it works well.

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