Would I? No. But should you? Maybe. Java is hardly the fastest moving language out there but it's still incredibly popular and heavily used in numerous circles,

Would I? No. But should you? Maybe. Java is hardly the fastest moving language out there but it's still incredibly popular and heavily used in numerous circles, will keep you employed, and has been modernizing enough to not be too much of a drag IMO (depending on the practices of the companies/teams where you end up using it). Java has a good story to tell in quite a few areas (mostly thanks to the JVM, to be fair) and doesn't deserve the reputation it tends to have in public fora. If you're going on to the JVM anyway, you'll benefit from at least doing some Java even if you end up doing Kotlin or Scala full-time.