Problem with java_import on Android (Ruboto)

Simple java_imports now throw an exception:

Initializing JRuby...Done
>>[Running toast.rb]
org.jruby.exceptions.RaiseException: (NoMethodError) undefined method `name' for #<Java::JavaLang::Package:0x407a8580>
at Object.java_import(file:/mnt/asec/org.ruboto.irb-2/pkg.apk!/builtin/javasupport/core_ext/object.rb:61)
at #<Class:0x1405e96d0>.(root)(<script>:2)
=> null

The line:
import 'android.widget.Toast'

Same problem if it is java_import. Java::android.widget::Toast works fine. Same problem with core classes like java.lang.Thread. Can't duplicate when not on Android.

This works fine with JRuby 1.5.6 and JRuby 1.6.0.RC1. I tried to use the latest (today) code on github, but "ant gem" failed.