When using jshell from Java 12.0.1 on Windows 10, I cannot easily work with the command history by using the up/down arrows. This is best shown using a screencast of my command prompt.:

https://i.imgur.com/nu6aa5R.gifv

After entering the "var i = 1;" command, I'm trying to repeat that command by simply hitting the up arrow key on my machine. It then displays random characters (first "a", then "OA"). Once I delete those characters, I can access the actual commands I executed previously.