Java EE (Java Enterprise Edition) General Discussion

Hi,

I want to create a simple application that uses JPA. The application will do only queries (not insert or update) and show the results with a simple custom web app. So good, so far. I can implement this :)

One thing that I also need is to update some values over time.
So, the question is, if I use another DB application/client (outside from EE Container) and update the records (that JPA application reads), do this will cause conflicts, race conditions or present not valid data??

The DB application client could be any DB client like TOAD.

My query is, if this behaviour is valid (with JPA) and if not what other options exist?
JDO or other persistence API has the same behaviour?

Thanks,
qiozas