Fix a concurrent modification error in the session
Fix a concurrent modification error in the session

jhstatewide/jruby-rack,jhstatewide/jruby-rack,jhstatewide/jruby-rack,atambo/jruby-rack,jruby/jruby-rack,jruby/jruby-rack,janrain/jruby-rack,jruby/jruby-rack,atambo/jruby-rack,atambo/jruby-rack,atambo/jruby-rack,janrain/jruby-rack,jruby/jruby-rack,jhstatewide/jruby-rack,jruby/jruby-rack,janrain/jruby-rack,jruby/jruby-rack,janrain/jruby-rack