I have just tried to add a float variable (not sure if variable is the
correct term) to an existing datastore class, and Im getting an error
now when trying to retrieve the data:

com.google.gwt.user.server.rpc.UnexpectedException: Service method
'public abstract java.lang.String[][]
com.ideba.net.client.AppointmentService.getAppointments
(java.util.Date,java.util.Date) throws
com.ideba.net.client.NotLoggedInException' threw an unexpected
exception: java.lang.NullPointerException: Datastore entity with kind
Appointment and key Appointment(130) has a null property named Paid.
This property is mapped to com.ideba.net.server.Appointment.Paid,
which cannot accept null values.

This is understandable, but I cant work out how to get around this
issue.

Ive tried setting the constructor to initiate it, but i didnt expect
that to work really as the existing data is already there!

Ive also tried to create a function to work through the database
setting this variable to 0, but it came back with the same error...

does anyone have any tips how to deal with this?

Thanks,
J
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