Thank you, Roy. I've updated jdo class and everything goes as
described.

On Oct 19, 6:24 pm, Roy Smith <[email protected]> wrote:
> The old entities will still be there. If your field types are objects (Long,
> Boolean, etc) they will return null. If they are base types (int, boolean)
> you will get an error.
>
> On Mon, Oct 19, 2009 at 3:15 PM, Artem Kuroptev <[email protected]> wrote:
>
> > I have a class with JDO annotations in it. There is a number of
> > entities of that class already in Data Store. I need to add a new
> > field to the class. Is it safe for the data to add a new field to JDO
> > class? Will my entities stay available with 'null' returned for the
> > new field or they will be erased?
>
> > Thanks in advance.
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