JRuby 9k doesn't work with Puma and 4 Torque

My app works fine with jruby-1.7.12 with puma and 4 torque.

And I try the latest jruby-graal (9k) with puma and 4 torque.

But my server doesn't start with jruby-graal. This is where it gets stuck.

krunal@krunal-Lenovo-IdeaPad-U530-Touch:~/code/test$ rails s puma 
file:/home/krunal/.rvm/rubies/jruby-graal/lib/jruby.jar!/jruby/java/core_ext/object.rb:27 warning: ambiguous Java methods found, using isJavaIdentifierStart(int)
file:/home/krunal/.rvm/rubies/jruby-graal/lib/jruby.jar!/jruby/java/core_ext/object.rb:28 warning: ambiguous Java methods found, using isJavaIdentifierPart(int)
file:/home/krunal/.rvm/rubies/jruby-graal/lib/jruby.jar!/jruby/java/core_ext/object.rb:27 warning: ambiguous Java methods found, using isJavaIdentifierStart(int)
file:/home/krunal/.rvm/rubies/jruby-graal/lib/jruby.jar!/jruby/java/core_ext/object.rb:28 warning: ambiguous Java methods found, using isJavaIdentifierPart(int)