"text".isutf8
TypeError: no implicit conversion of Fixnum into String
from org/jruby/RubyString.java:5300:in force_encoding' from /xxx/.rvm/rubies/jruby-9.0.0.0/lib/ruby/stdlib/kconv.rb:193:inisutf8'
from /xxx/.rvm/rubies/jruby-9.0.0.0/lib/ruby/stdlib/kconv.rb:281:in isutf8' from (irb):7:in'
from org/jruby/RubyKernel.java:979:in eval' from org/jruby/RubyKernel.java:1292:inloop'
from org/jruby/RubyKernel.java:1099:in catch' from org/jruby/RubyKernel.java:1099:incatch'
from /xxx/.rvm/rubies/jruby-9.0.0.0/bin/irb:13:in `'