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copied!<p><strong>Edit:</strong> Looks like somebody created a <a href="http://jruby-rack.appspot.com/" rel="nofollow noreferrer">sample JRuby-Rails application</a> - this should be an easy starting point. Sample code is <a href="http://github.com/nicksieger/jruby-rack/tree/master/examples/rails" rel="nofollow noreferrer">here</a>.</p> <p>It appears that there are a few projects being worked on to create App Engine adapters for the <a href="http://datamapper.org" rel="nofollow noreferrer">DataMapper</a> ORM. <a href="http://blog.s21g.com/articles/1426" rel="nofollow noreferrer">This one</a> should work with the current version of DataMapper (0.9.11), and <a href="http://code.google.com/p/appengine-jruby/" rel="nofollow noreferrer">this one</a> requires the 0.10.0 version in development. They're both pretty new (to be expected, given how recently the App Engine Java announcement was made), so I can't vouch for their current quality, of course.</p> <p>Using DataMapper with Rails requires a bit of extra configuration; see <a href="http://blog.teksol.info/2008/10/16/how-to-use-datamapper-from-rails-including-migrations-and-tests" rel="nofollow noreferrer">this blog post</a> for more information. This will be made less onerous by Rails 3, which is intended to be ORM agnostic after the merge with Merb. If Rails 2.3 + DataMapper presents problems, one can also consider other Ruby web frameworks (<a href="http://merbivore.com" rel="nofollow noreferrer">Merb</a>, <a href="http://www.sinatrarb.com/" rel="nofollow noreferrer">Sinatra</a>, etc.).</p> <p><a href="http://github.com/knowtheory/reggae/tree/master" rel="nofollow noreferrer">This library</a> may also prove helpful in setting up a JRuby web app on GAE. I haven't tested any of these out, so YMMV.</p>

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