Recently, NetBeans was not able to start up Mongrel automatically from a Rails project. I had to open up a console and manually start “script/server” - not what I expect when using an IDE.
I thought it was because of Rails 2.3.x - unsupported by Netbeans as I suspected.The actual reason behind it was the update to Ruby 1.8.7 in Snow Leopard!
Make sure to give that info to Netbeans via the “TOOLS” -> “RUBY PLATFORMS” window. Just delete your old Ruby record from the list left (don’t delete JRuby, though) and click the “AUTODETECT” button (red circled below):

After that, you’ll see the new Ruby 1.8.7 (see screenshot below). Click “Close” and voilá!

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