Rails console issues using JRuby: no prompt character, no tab completion, broken arrow keys, etc

Question

I\'m having various issues with my Rails console under JRuby, including

• No prompt character
• Tab completion not working (literal tab gets insert

Answer 1

Running the console with the following fixed these sorts of problems for me:

jruby -Xlaunch.inproc=true -S rails c

If you don't like running that command every time, you can set an environment variable:

set JRUBY_OPTS=-Xlaunch.inproc=true

or

export JRUBY_OPTS=-Xlaunch.inproc=true

then

rails c

Answer 2

I had this issue with Windows and the fix was to increase the "Number of Buffers" in the Command prompt settings. Command Prompt -> Properties -> Options -> Number of Buffers Default is 4, I changed to 8 and all worked well (I think 5 would work though)