JPA and Threads in play framework

Question

I\'m trying to create a multithreading server. The problem is that I get the following error: play.exceptions.JPAException: The JPA context is not initialized. JPA Entit

Answer 1

I am guessing your thread is kicked off before Play has a chance to start the JPA Entity Manager.

If your Model class is annotated with @Entity, then the entity manager would have been created and your error would not appear.

So, you have a couple of options. Either,

1. You can create a PlayPlugin, with a lower priority than the Play standard onApplicationStart processes.
2. You can kickstart your thread from a bootstrap job. This will ensure that Play has had a chance to start up correctly before you start interacting with the server. To see more about bootstrap jobs, see http://www.playframework.org/documentation/1/jobs#concepts

Personally, I would go with option 2. It is better documented, and play plugins are meant more for extending the framework rather than changing the order of processing.