Update basic.rb

[monkstone]

Since JRuby-9.2.11.xx need to explicitly import jruby, import javadoesn't work anymore (correct me if I'm wrong)

[headius]

@monkstone The 'java' import is fine, but it is required at boot by JRuby since 9.0 since we use Java integration for some Ruby internals.

The jruby require is necessary only for "internal" features of the JRuby module, like parsing or compiling code, accessing the raw Java object for a given Ruby object, or as in this case, accessing the current JRuby runtime with JRuby.runtime.

I don't see us ever changing the fact that java is loaded at boot, so this change seems appropriate.