1. I added @Basic annotation with fetch type eager and it works. Till now I was pretty sure that embedded object are always fetched and I thought that this problem is related to the appengine.
2. Here is my persistence.xml file. Do you suggest that I should use transactions to get it working ? I'm using appengine for the first time and this app is actually testing app, I'm testing the new api Editors, RF. That's why i don't know much about appengine and its datastore.
<?xml version="1.0" encoding="UTF-8" standalone="no"?>
<property name="datanucleus.NontransactionalRead" value="true" />
<property name="datanucleus.NontransactionalWrite" value="true" />
<property name="datanucleus.ConnectionURL" value="appengine" />
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