I have written some study material for the SCBCD 6 / OCPJBCD certification freely downloadable here:
http://www.slideshare.net/krizsan/ocp-jbcd-6-study-notes Chapter 13 is still not written yet but will be available in a near future.
I very much welcome feedback and suggestions - please do not hesitate to contact me either by replying to this topic or sending a private message.
The book has, once again, been updated after excellent feedback I have received on Slideshare (many thanks!).
A number of errors have been corrected and some unclear sections have been rewritten to become more understandable.
The book was written prior to Oracle supplying the detailed study objectives. It may not cover everything in these study objectives and should not be relied upon as the single source of information when preparing for the certification.