There are worlds between Java 8 and Scala and the gap is widening with every release.<p>Of course you can write Java in Scala and then the benefits over Java aren&#x27;t that high (but are still there), but Scala is so far ahead in terms of language compared to Java that most current Scala libraries just _can&#x27;t exist_ in Java.<p>Adoption these days seems to be great and accelerating, and given the growth of the library ecosystem there are more and more reasons to leverage the benefits of libraries written in Scala especially compared to legacy stuff written in Java.