common_converters.rb gets loaded twice causing errors

[korzry]

Depending on where the jrubyfx gem is installed, common_converters.rb gets loaded twice. When the gem is installed in GEM_HOME along side the ruby installation, no warnings are issues. When installed in the the user's home directory, the following warning are issue:

/net/sunshine/vol/homes/ryan_/.gem/jruby/2.3.0/gems/jrubyfx-1.1.1-java/lib/jrubyfx/utils/common_converters.rb:28: warning: already initialized constant ARG_CONVERTER_SUFFIX                                                                                     
/net/sunshine/vol/homes/ryan/.gem/jruby/2.3.0/gems/jrubyfx-1.1.1-java/lib/jrubyfx/utils/common_converters.rb:31: warning: already initialized constant NAME_TO_COLORS                                                                                           
/net/sunshine/vol/homes/ryan/.gem/jruby/2.3.0/gems/jrubyfx-1.1.1-java/lib/jrubyfx/utils/common_converters.rb:137: warning: already initialized constant CONVERTERS                                                                                              
/net/sunshine/vol/homes/ryan/.gem/jruby/2.3.0/gems/jrubyfx-1.1.1-java/lib/jrubyfx/utils/common_converters.rb:172: warning: already initialized constant ENUM_CACHE                                                                                              
/net/sunshine/vol/homes/ryan/.gem/jruby/2.3.0/gems/jrubyfx-1.1.1-java/lib/jrubyfx/utils/common_converters.rb:175: warning: already initialized constant ENUM_OVERRIDES  

This seems to be related to using require vs require_relative.

>> grep common_converters */*
core_ext/drag_event.rb:require 'jrubyfx/utils/common_converters'
core_ext/radial_gradient.rb:require 'jrubyfx/utils/common_converters'
utils/common_utils.rb:require_relative 'common_converters'

Notice that common_utils.rb uses require_relative. With jruby_9.1.2.0, the require and require_relative are not resolving to the same file causing common_converters to be loaded twice. Changing the require_relative to require solves this issue.