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Arun Gupta has posted some information about using Java DB / Apache Derby as part of a JRuby on Rails application on GlassFish. Java DB is bundled with GlassFish and can be used as a multi-user RDBMS, running embedded in the same JVM as GlassFish or as a standalone database server in its own host and JVM.
I heard the news from JRuby core developer Olivier Nutter at CommunityOne as I was setting up for my presentation with Kevin Henrikson from Zimbra.
Yes, so ThoughtWorks Studios will have their collaborative development project management solution named Mingle be the first commercially-distributed Rails application to run on JRuby.
Mingle 1.0 which should be released in June 07', will be running with a Jetty web front-end and an Apache Derby database back-end.
InfoQ blog on the subject reports that performance has not been a major concern. The current runtime easily supports hundreds of concurrent users with a simple cluster, and JRuby performance has been getting faster all the time. According to the team, experimental deployments have included 10 JRuby interpreters running in a single JVM process.
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