Ruby class inheritance not supported by jrubyc --java

The Java code generated by jrubyc --java does not appear to support Ruby class inheritance. Given the following simple example:

class A
  def my_class; self.class.name end
end

class B < A
end

The generated class in B.java inherits from RubyObject rather than A, rendering the B class completely broken in Java.

On a somewhat related note, module inclusion doesn't seem to work either. A class with include M doesn't get M's methods in the generated Java code.