Integrate r9381 into GWT 2.1 branch.
Disallow persisted entities with null version properties because it breaks RequestFactory update semantics.


git-svn-id: https://google-web-toolkit.googlecode.com/svn/releases/2.1@9382 8db76d5a-ed1c-0410-87a9-c151d255dfc7
6 files changed