As leszek says I think you have a few things confused: DataNucleus is a JDO/JPA implementation that can run within AppEngine.
AppEngine provides 2 persistence mechanisms, BigTable and VFS (Virtual File System). You cannot configure your GoogleApp to use an external RDBMS, nor can you host an RDBMS within your GoogleApp. Also note that with each DB record, BigTable effectively stores not only the data but also the metadata for the table. Ie all the column names are stored alongside the column data, for each record. So a Gigabyte of data will commonly consume 10GB of space within BigTable. Using GWT on your client is orthogonal, to the persistence on the server. However, if you have a clean JPA (non-Hibernate specific) implementation you might have a way continue to use JPA within your GoogleApp by using a H2 RDBMS implementation running on top of VFS. See http://groups.google.com/group/google-appengine-java/browse_thread/thread/fce7750aad2845ff?hl=en and http://groups.google.com/group/gaevfs/browse_thread/thread/c23b8af5791b3a4 On a side note, Andy (aka Datanucleus) you need to chill dude. Users are reporting problems with Datanucleus because they are feeling pain. Barking at them is not the way to win support and market share for Datanucleus, quite the opposite. William --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to the Google Groups "Google App Engine for Java" group. To post to this group, send email to [email protected] To unsubscribe from this group, send email to [email protected] For more options, visit this group at http://groups.google.com/group/google-appengine-java?hl=en -~----------~----~----~----~------~----~------~--~---
