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Migration Guide 2.1.x to 2.2.x

The 2.2 release contains several structural changes that require some simple, mechanical source-level changes in client code.

When migrating from 1.3.x to 2.1.x you should first follow the instructions for migrating 1.3.x to 2.0.x and then :ref:`2.0.x to 2.1.x <migration-2.1>`.

Immutable everywhere

Akka has in 2.2 been refactored to require scala.collection.immutable data structures as much as possible, this leads to fewer bugs and more opportunity for sharing data safely.

Search Replace with
akka.japi.Util.arrayToSeq akka.japi.Util.immutableSeq

If you need to convert from Java to scala.collection.immutable.Seq or scala.collection.immutable.Iterable you should use akka.japi.Util.immutableSeq(…), and if you need to convert from Scala you can simply switch to using immutable collections yourself or use the to[immutable.<collection-type>] method.

API changes to FSM and TestFSMRef

The timerActive_? method has been deprecated in both the FSM trait and the TestFSMRef class. You should now use the isTimerActive method instead. The old method will remain throughout 2.2.x. It will be removed in Akka 2.3.

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