[google-appengine] Separate sets of system properties for production and development

I am trying to use two sets of system properties for an App Engine application. Is there a way to specify the development properties somewhere and the production properties somewhere else so that depending on the execution environment the correct set is loaded? I am new to App Engine, and this

[google-appengine] JPA question - Parent Child relationship

What is the meaning of this error message? I get this message when updating "Tenant" Attempt was made to manually set the id component of a Key primary key. If you want to control the value of the primary key, set the name component instead. this is my entity class @Entity public class Tenant

[google-appengine] How to build one to one relationship using JPA?

I have two entity class, Tenant and Contact. is it the right way? if not can anyone share a sample. @Entity public class Tenant { @Version() private Long version; @Id @GeneratedValue(strategy = GenerationType.IDENTITY) private Long tenantId; @OneT