Guice-persist was based on warp-persist which had the concept of finder methods.
http://code.google.com/p/google-guice/wiki/GuicePersist
was based on
http://code.google.com/p/warp-persist/
I can see that there is an annotation for @Finder in guice-persist similar to warp-persist but there is no documentation.
Yes, you need to add the finders to the JpaPersistModule
when you create it:
Module persistModule = new JpaPersistModule(...)
.addFinder(SomeFinder.class)
.addFinder(OtherFinder.class);