How to create a scala.collection.immutable.Seq from a Java List in Java?

Question

I'm trying to get Akka going in my Java project, and I'm hung up on a small issue with the Seq type(s) from Scala. I'm able to convert my Java List of ActorRef into a scala.collection.Seq, but the Akka API I'm trying to use requires a scala.collection.immutable.Seq. How can I make one?

Code:

static class Router extends UntypedLoadBalancer {     private final InfiniteIterator<ActorRef> workers;      public Router(List<ActorRef> workers) {         Seq workerSeq = asScalaBuffer(workers);          // how to get from the scala.collection.Seq above to the instance of         // scala.collection.immutable.Seq required by CyclicIterator below?         this.workers = new CyclicIterator<ActorRef>();     }      public InfiniteIterator<ActorRef> seq() {         return workers;     } } 

Answer 1

You can use scala.collection.JavaConversions.asScalaBuffer to convert the Java List to a Scala Buffer, which has a toList method, and a Scala List is a collection.immutable.Seq.

Answer 2

The akka Java documentation for routers as well as the ScalaDoc for CyclicIterator both suggest that the CyclicIterator constructor takes a List.