> When I do this, the main entity will not be updated in the datastore > since I never actually modified the member itself
Shouldn't make the slightest bit of difference. GAE/J ought to replace that List with a wrapper that intercepts update operations. It hasn't done that. http://code.google.com/p/datanucleus-appengine/issues/detail?id=144&colspec=ID%20Stars%20Type%20Status%20Priority%20FoundIn%20TargetRelease%20Owner%20Summary You could call "JDOHelper.makeDirty()" on that field to try to force it to mark it dirty, but the root cause is GAE/J
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