How to convert Java collection / list to Scala seq?

Question

I am trying to create an instance of the Kafka Scala class from Java code and has the following signature:

case class OffsetFetchRequest(groupId: String,
                          requestInfo: Seq[TopicAndPartition],
                          versionId: Short = OffsetFetchRequest.CurrentVersion,
                          correlationId: Int = 0,
                          clientId: String = OffsetFetchRequest.DefaultClientId)

I can send all the requested parameters except Seq[TopicAndPartition].

On the Java side, I have the following code:

OffsetFetchRequest offsetFetchRequest = new OffsetFetchRequest(
                                                "someGroup", 
                                                topicAndPartitions, 
                                                (short)1, 
                                                1, 
                                                "clientId");

As expected, a is java.util.Listincompatible with Scala Seq. However, I have tried all types of conversion methods in JavaConversionsand JavaConverters, and I can not find anything that matches this case.

How to create Scala Seqfrom the usual java.util.Listor even java.util.Collection? Or am I getting it wrong?

Answer 1

scala.collection.JavaConversions.asScalaBuffer, Java Scala, toList seq.

, CyclicIterator.