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Re:Twitter: From Ruby on Rails to the JVM [video] by hello_moto on Saturday July 30, 2011 @04:28PM (#2826659)
Many people seem to refer only the scalability (performance, that is) side of the argument but only few who actually pointed out the developer's productivity of choosing Scala and Java for Twitter situation.

http://www.infoq.com/articles/twitter-java-use

Re:Twitter: From Ruby on Rails to the JVM [video] by schumihan on Saturday July 30, 2011 @10:21PM (#2827423)
Agreed. You can achieve very high productivity if you use Scala and Java properly.