H2 DB has been mentioned as yet another embedded DB for us to support.
Judging from this [1], we can solve Modeler preferences DB concurrency problems using H2 "socket" locks. I was thinking of writing a similar socket-based mechanism for HSQLDB, but since somebody has already done it, we should use it. So an adapter for H2 (CAY-884) becomes an even more attractive proposition.
Andrus[1] http://www.h2database.com/html/frame.html?advanced.html% 23file_locking_protocols&main
