Home/ Questions/Q 558945
In Process

The Archive Base Latest Questions

Editorial Team
  • 0
Asked: 2026-05-13T12:11:07+00:00

I’m using the Google app engine and JDO. What is the best way to

  • 0

I’m using the Google app engine and JDO. What is the best way to update a JDO class definition without having to wipe the data store contents first?

I’m not sure if this is specific to JDO on GAE, but I noticed that when I simply change the name of one of my persistent fields from svotes to votes, an exception is thrown (java.lang.NoSuchFieldError: svotes).

I expect once my site goes live I might want to make some changes to my JDO class definitions, such as adding a field or something. Any suggestions for how to update the data definitions without having to wipe the database?

Share

Leave an answer

You must login to add an answer.

Need An Account,

1 Answer

  1. Editorial Team

    Apparently Google has a python related article about updating the schema: http://code.google.com/appengine/articles/update_schema.html. The guidelines can be applied to java too.

    • 0