Is it possible to access a local HSQL database from Ruby as well as from Java? (separately of course, not concurrent) The Ruby SQL toolkit called Sequel, for example, claims to have "adapters" for JDBC, so I think the answer is yes, yes? =)
If the answer is "kind of" or something, is there a better RDBMS that would allow straightforward access from both languages? Ideally I would want support for server-side DB's as well...