Converting a Scala typed collection to Java with unlimited wildcard, etc. Collection <?>

Question

Problem: It is necessary to implement an interface from a third-party Java library in Scala

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Collection<?> getItemPropertyIds()

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My solution is to use ...<here goes Iterable>.asInstanceOf[java.util.Collection[_]]

 val props:Map[Object,Property] = ...
 override def getItemPropertyIds()=props.keys.asInstanceOf[java.util.Collection[_]]

Is there a better solution? Maybe with Predef implied?

Answer 1

Create scala. Use, use scala.collection.asJavaCollection () (may be implicit) to convert to java.util.Collection.

Answer 2

I will also try:

import scala.collection.JavaConversions
...
override def getItemPropertyIds() = JavaConversions.asCollection(props.keys)