Java EE 6 - BPM Solution (Business process management)

Hello,
i'm looking for a BPM solution in java (maybe with a graphical editor).

I'm using a Java EE6 app with glassfish 3 and i would like to use Business Process Management BPM.

I see jBPM (jboss), bonita and openESB, but i don't know witch is the best choice for my EE 6 + glassfish app.

Do you know witch is a valid solution (best if not paid)?
Thank you

Iacopo