Java is rock stable and "complete". Not just the language itself. Build tools, JVM, profiling, dependency management. Everything is at least decent, most language problems were solved years ago. I have used many languages and nothing comes close to Java in the balance of speed, flexibility, ecosystem, and polish. If you're not sure which language will be best for a project, Java is perfect.

I work on a codebase with hundreds of thousands of lines that haven't been touched in 15 years. We're on Java 11 with plans to update to 17 later this year. Our 8->11 upgrade took me 3 days on a million+ line codebase. And when we released there were zero bugs related to the upgrade.

Java has the stability keep projects maintainable over decades. The only mainstream language with comparable backwards compatibility is C.