Hi,
I'd suggest to have a build property that specified which database to use
and to default it to Hypersonic SQL.
Hypersonic SQL is nice because:
1/ It's small: a single JAR
2/ It doesn't need to be started
3/ It's fast (in-memory mode)
So it's perfect for testing.
We still need the ability to switch to MySQL using a build property though
but at least anyone building the XWiki project will succeed...
WDYT?
-Vincent