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When using JRuby and WEBrick, loading Rails takes so long that often the application is not yet ready when the Run action has launched a browser to display it, forcing the user to reload the page. Caused by that currently we assume that when WEBrick outputs 'Rails application started at 3000' the app is ready, but this is not the case.
*** Issue 142547 has been marked as a duplicate of this issue. ***
This is also happening under Glassfish V3 (as well as WEBrick and Mongrel) so I don't believe it's necessarily the "Rails application started at 3000' line that is quoted in the initial statement.