Hi, I think that this thread is useful. http://groups.google.com/group/google-appengine-java/browse_thread/thread/d13d469752c825e7
Look for past threads It may have useful information Hope this helps, thanks. > No, this is not expected behavior. Try rolling back your application and > seeing if this still occurs. I suspect something else is wrong - you just > need to narrow down the version of your application that causes this to > happen. > > 2010/4/27 Marcos Vinícius Soares <[email protected]> > > > > > I believe this is not allowed. Once you change a class you cannot retrieve > > the older objects anymore. In this case, you added a field to a class, but, > > what if you had removed two fields!? How is the framework supposed to treat > > this!? > > > Try rolling back your class and see if you can retrieve the old objects. I > > believe you will only be able to get them this way. > > > On Tue, Apr 27, 2010 at 4:22 PM, kghate <[email protected]> wrote: > > >> any ideas on what I am doing wrong? Please help! > > >> On Apr 27, 12:31 am, kghate <[email protected]> wrote: > >> > I am storing some persistent data and all is working fine, I have a > >> > simple data class per examples provided in the "Storing Data" section. > > >> > However, I noticed that all my stored data got reset to null when I > >> > added a couple new fields to be stored. > > >> > To give an example, my "employee" data class was storing firstName and > >> > DOB and had 5 entries. I added two more fields, lastName and > >> > isPermanent and found that my earlier 5 entries got reset to null. The > >> > new data class is working fine and all new entries are being stored as > >> > expected, but I lost existing entries. > > >> > What am I doing wrong here? Is this expected behavior? How do I ensure > >> > that existing data does not get reset when new persistent fields are > >> > added to the data class? > > >> > Please help! > > >> > -- > >> > 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]<google-appengine-java%[email protected]> > >> . > >> > For more options, visit this group athttp:// > >> groups.google.com/group/google-appengine-java?hl=en. > > >> -- > >> 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]<google-appengine-java%[email protected]> > >> . > >> For more options, visit this group at > >>http://groups.google.com/group/google-appengine-java?hl=en. > > > -- > > 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]<google-appengine-java%[email protected]> > > . > > For more options, visit this group at > >http://groups.google.com/group/google-appengine-java?hl=en. > > -- > Ikai Lan > Developer Relations, Google App Engine > Twitter:http://twitter.com/ikai > Delicious:http://delicious.com/ikailan > > ---------------- > Google App Engine links: > Blog:http://googleappengine.blogspot.com > Twitter:http://twitter.com/app_engine > Reddit:http://www.reddit.com/r/appengine > > -- > 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 > athttp://groups.google.com/group/google-appengine-java?hl=en. -- 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.
