Assuming you meant specifically the Java language, Kotlin for JVM may also be a good option. Solid set of language features that puts it at least on par with C#, and allows you to write more DRY code than you can with Java language. As with any JVM language, you get all the benefits of the JVM. IDE support is great (at least with IntelliJ IDEA). It's an officially supported Android development language, putting it further into the mainstream. Also, as with other non-Java JVM languages, releases are not tied to JVM releases (I still use Java 8 for my Kotlin projects, while using the latest Kotlin version).

For browser or Node.js, TypeScript is the way to go IMHO. Node.js and it's ecosystem have it's issues, but TypeScript is quite nice and a considerable improvement over JavaScript, while being close enough to JS where it fits nicely into the ecosystem. Only downside is that it adds a compile step that can potentially grow to be time-consuming.