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The classpath parsing code in lib/duby.rb line:240

  when '--classpath', '-c'
    args.shift
   args.shift.split(RbConfig::CONFIG['PATH_SEPARATOR']).each do |path|
      $CLASSPATH << path
    end

PATH_SEPARATOR on Ubuntu returns '' as it is not set and thus the parsing fails to correctly parse out the classpath.

This needs a default value of ';' (semi-colon) under Windows and ':' (colon) on *nix. Also where class paths are hardcoded to use ':' (see rake tasks) this should be generated to use the correct delimiter for each OS.

FYI: the error you get on linux is:
llinux:~/duby$ ../jruby/bin/jruby -S rake compile
mkdir -p dist
mkdir -p build
Compiling Ruby sources
Generating Java class DubyCommand to build/org/jruby/duby/DubyCommand.java
javac -d build -cp ../jruby/lib/jruby.jar:. build/org/jruby/duby/DubyCommand.java
Compiling Duby sources
org/jruby/duby/ant/compile.duby:2: cannot load Java class org.jruby.duby.DubyCommand
import org.jruby.duby.DubyCommand
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

An example, with the Android API:

hello = self
btn.setOnClickListener do
  def onClick(v)
    return if hello.txt.getText.toString.length == 0
    hello.addMessage("hellotester", Hello(v.getContext).txt.getText.toString)
    message = Bundle.new
    message.putString("say", Hello(v.getContext).txt.getText.toString)
    Message m = Message.obtain
    m.setData(message)
    hello.client.handler.sendMessage(m)
    hello.txt.setText("")
  end
end

hello is not accessible. Workaround here is to use Hello(v.getContext) (where Hello is the name of the class).

It is currently possible to access the command line arguments when writing a Duby script like this

class MyClass
  def self.main(args:String[])
     puts args
  end
end

But it's not possible to use ARGV like it is in Ruby. This script will currently fail:

puts ARGV

It would be cool if ARGV would be available outside explicitly declared classes.
In the generated java code, args is available at the moment, but at compile time, the type of args cannot be inferred. I guess it could be enough to globally declare args as String[] but I prefer the usage of ARGV outside of an explicit main method.

Accessing nested classes currently tries to call the nested class as a method on the parent, rather than just getting that class.

Current workaround is to import the nested class itself, via this syntax:

import "Child", "com.example.Parent$Child"

And then just use Child.