Warn if not JDK8

Author: monkstone

lib/jruby_art/runner.rb

@@ -152,6 +152,8 @@ def show_help
 
     def show_version
       require 'erb'
+      require_relative 'helpers/version_error'
+      warn 'JDK8 is preferred' unless ENV_JAVA['java.specification.version'] == '1.8'
       template = ERB.new <<-EOF
         JRubyArt version <%= JRubyArt::VERSION %>
         Ruby version <%= RUBY_VERSION %>

library/color_group/color_group.rb

@@ -9,7 +9,7 @@ def initialize(p5cols)
   end
 
   def self.from_web_array(web)
-    ColorGroup.new(ColorUtil.web_array(web))
+    ColorGroup.new(ColorUtil.web_array(web.to_java(:string)))
   end
 
   def shuffle!