# coding: utf-8

# 'α'.bytes => [206, 177]
class C_α
  p self.to_s.bytes
end

$ jruby blah.rb
[67, 95, 206, 177]

$ jrubyc --java blah.rb
Encoding::CompatibilityError: incompatible encodings: ASCII-8BIT and UTF-8
                          static_init at /Users/xxxxxx/.rbenv/versions/jruby-9.1.9.0/lib/ruby/stdlib/jruby/compiler/java_class.rb:396
                                 to_s at /Users/xxxxxx/.rbenv/versions/jruby-9.1.9.0/lib/ruby/stdlib/jruby/compiler/java_class.rb:492
  block in compile_files_with_options at /Users/xxxxxx/.rbenv/versions/jruby-9.1.9.0/lib/ruby/stdlib/jruby/compiler.rb:155
                                 open at org/jruby/RubyIO.java:1156
  block in compile_files_with_options at /Users/xxxxxx/.rbenv/versions/jruby-9.1.9.0/lib/ruby/stdlib/jruby/compiler.rb:154
                                 each at org/jruby/RubyArray.java:1734
  block in compile_files_with_options at /Users/xxxxxx/.rbenv/versions/jruby-9.1.9.0/lib/ruby/stdlib/jruby/compiler.rb:144
  block in compile_files_with_options at /Users/xxxxxx/.rbenv/versions/jruby-9.1.9.0/lib/ruby/stdlib/jruby/compiler.rb:297
                                 each at org/jruby/RubyArray.java:1734
           compile_files_with_options at /Users/xxxxxx/.rbenv/versions/jruby-9.1.9.0/lib/ruby/stdlib/jruby/compiler.rb:281
                         compile_argv at /Users/xxxxxx/.rbenv/versions/jruby-9.1.9.0/lib/ruby/stdlib/jruby/compiler.rb:94
                               <main> at /Users/xxxxxx/.rbenv/versions/jruby-9.1.9.0/bin/jrubyc:5

$ jrubyc blah.rb
$ jruby blah.class
LoadError: blah.class is not compiled Ruby; use java_import to load normal classes

$ jruby -v
jruby 9.1.9.0 (2.3.3) 2017-05-15 28aa830 Java HotSpot(TM) 64-Bit Server VM 25.121-b13 on 1.8.0_121-b13 +jit [darwin-x86_64]
$ uname -a
Darwin mac-mini.local 15.6.0 Darwin Kernel Version 15.6.0: Mon Jan  9 23:07:29 PST 2017; root:xnu-3248.60.11.2.1~1/RELEASE_X86_64 x86_64