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  • JSR 166 
    • jsr166x - included in JDK 1.6, does not contain ForkJoin
    • jsr166y - compiled with JDK 1.6, included in JDK 1.7. jsr166y jar has fixes past what is in the JDK 1.6.
    • jsr166e - compiled with JDK 1.87, to be included in JDK 1.8. jsr166e jar has fixes past what is in JDK 1.7. 
  • Scala solution
    • Repackage known version of jsr166y as scala.concurrent and include in the Scala language (Akka makes use of it from there)
      • Covers JDK 1.6+ (good) but does not contain the very latest updates for JDK 1.8 that are in jsr166e (bad)
      • When they have a version of Scala that requires JDK 1.7, they will presumably update to jsr166e
    • Akka has pluggable executor providers and using a custom one allows you to make use of jsr166e if you need it