Java is the backbone of so many enterprise apps out there. It’s got a lot of momentum. While I prefer the syntax of other languages I could easily see my knowledge of Java/spring being a value add the rest of my career
Java is great. It doesn't duck the hard problems the way many other programming languages do. If you want to use threads it "just works". It's incorporated many of the best features of ML family programming languages and after working with Scala, Kotlin and other alternatives I love creating DSLs in Java.