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how to implement JPA

I have developed an application in Java that is registered on Google App Engine. I need to store some data on data store. But, I am completely unaware about its implementation. Actually, I have ...
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How to migrate data from Google AppEngine Datastore

How to migrate data from Google AppEngine's Datastore to other database (not Datastore)? There is appcfg.py download_data but it produces sqlite3 file with empty bulkloader_database_signature and ...