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A fork of the actor library from Scala 2.7.7 that completely removes Scala's built-in copies of java.util.concurrent.* classes from its implementation and instead relies on their original versions in the standard Java library.


The built-in copies are from an old version of the Doug Lea's public-domain code. The Java runtimes ship with versions of the code that is kept up-to-date, with bugs being fixed and code begin enhanced. Simply by upgrading to a new Java runtime, the actor runtime will benefit from any improvements to the concurrent classes. We originally created this project because the Scala copy of a concurrent class had a bug that caused very high GC pressure; that bug was however long fixed in the original Java library class version.


In order to use this library instead of Scala actor library, import com.twitter.actors.* instead of scala.actors.* in your code. Neither the functionality nor the interface of the actor library have been changed in any way.

Attila Szegedi <>