# File addon/buildr/nailgun.rb, line 76
      def ctor(on_class, *args)
        parameters = []
        classes = []
        args.each do |obj|
          case obj
          when nil
            classes.push(nil)
            parameters.push(nil)
          when Hash
            vclass = obj.keys.first
            value = obj[vclass]
            classes.push(vclass.java_class)
            parameters.push(value)
          else
            parameters.push obj
            classes.push obj.class.java_class
          end
        end
        on_class = [on_class.java_class].to_java(java.lang.Class)[0]
        ctor = on_class.getDeclaredConstructor(classes.to_java(java.lang.Class))
        ctor.setAccessible(true)
        ctor.newInstance(parameters.to_java(java.lang.Object))
      end