Thank you Maciej for your answer. But I think that my problem is not related to any empty field. The problem of storage arises as soon as you define twice a persistent field which is a list of the same type, as I explained earlier. The only work-around I found is to duplicate the listed persistent class (B), and have a "List<B'> list1" and a "List<B''> list2" (B' and B'' being copy-classes of B): but since, you cannot properly persist derived classes from persistent ones, I need to duplicate the code, which is a shame! If someone by Google can explain this restriction, this would help us a lot, and prevent from duplicating persistent classes...
Thank you for your help. Regards, Édouard --~--~---------~--~----~------------~-------~--~----~ 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 google-appengine-java@googlegroups.com To unsubscribe from this group, send email to google-appengine-java+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/google-appengine-java?hl=en -~----------~----~----~----~------~----~------~--~---
