Infrastructure and Middleware Community Summit in Mainz in June. This is all about Oracle Infrastructure and Middleware topics and has a great Speaker lineup for the German Oracle sphere. Matthias Marschall will present a Keynote on DevOps and the one day event will have plenty of content in basically two separate tracks for everybody.
I'm giving a two hour Hands on Lab about JAX-RS and Server Send Events with GlassFish server. There is still time to register for both the Summit and the lab.
Looking forward meeting you there!