2. Easy to find programmers?
3. Great networking and concurrency libraries?
4. Simple language with an amazing virtual machine?
5. Ecosystem has several good other languages that interop from good to amazing with Java including Scala, Clojure, JRuby, Groovy, and Kotlin.
After writing "good to amazing", you put an ordered list which many readers will subliminally rank in the order you provided, with the "amazing" languages on the right. I've tried 4 of those 6 languages, and would rank them in a different order.
> Ecosystem has several good other languages that interop from good to amazing
The ecosystem also has several other languages that interop from bad to amazing, just like other ecosystems.