Use Double instead of double. Double is an Object --> can be null.
fabrizio On Feb 5, 3:23 am, dreamy <dreamy2c...@...> wrote: > I have create lot of Object in past. when I add a property " private > double price;" to this object today .but i query the record again,the > exception is throw: > > java.lang.NullPointerException: Datastore entity with kind > PurchaseBilling and key PurchaseBilling(178) has a null property named > price. This property is mapped to > com.datong.drp.model.PurchaseBilling.price, which cannot accept null > values. > > I must clear all data and insert again? is there any other method to > add this property? -- 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.
