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If you are proficient in C# and have to switch to Java for a while you will be pretty frustrated.

Totally agree. Show some C# code to a Java dev and he will be fascinated.

And a Scala dev will find it strangely familiar :).

Agree. When I tried to learn Scala I found it very similar to C#, only changes the name map -> select, filter -> where and so on.

the JVM is not lacking of alternative languages, the JVM is not just Java.