A lot of that source is Java and thus accepted by javac, though looking at it

https://docs.oracle.com/javase/7/docs/technotes/tools/window...

  -encoding encoding
    Set the source file encoding name, such as EUC-JP and UTF-8. If 
    -encoding is not specified, the platform default converter is used.

where that last bit about the platform default converter is something I'd expect from a language that comes out of a squishier (like Python or POSIX) culture.