It might also depend on what you're trying to do. If you're trying to get a job on company (in your area) that uses Java (and you happen to like Java and the company) then go with Java. If you're trying to break into the consulting gig and there's lots of Kotlin jobs, then learn Kotlin ... substitute Kotlin and/or Java for whatever language applies. At the speed of how the tech world changes, I think there's certain advantage to being language agnostic. Each of these languages reached widespread adoption for a reason
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+1 on this. It all depends on the task to solve.
It might also depend on what you're trying to do. If you're trying to get a job on company (in your area) that uses Java (and you happen to like Java and the company) then go with Java. If you're trying to break into the consulting gig and there's lots of Kotlin jobs, then learn Kotlin ... substitute Kotlin and/or Java for whatever language applies. At the speed of how the tech world changes, I think there's certain advantage to being language agnostic. Each of these languages reached widespread adoption for a reason