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432562 (1) [Avatar] Offline
Hi. I've came across such claim in the Preface:
But Scala and Java programs have to be built as separate projects, or at least separate modules, whereas Kotlin and Java classes can be mixed inside the same module.

Unfortunately, I have to point out that this is not true - such feature isn't unique to Kotlin. I've worked on a few projects where Java files lived in the same module with Scala files, some where with Maven, some with sbt. In some of the projects Java functionality was gradually migrated to Scala without a "big bang" transition.