FULL PRODUCT VERSION :
javac 9-ea
java version "9-ea"
Java(TM) SE Runtime Environment (build 9-ea+115)

ADDITIONAL OS VERSION INFORMATION :
Microsoft Windows [Version 6.1.7601]

A DESCRIPTION OF THE PROBLEM :
Running these commands on Windows locks the command window with no visible typing:

Scanner in = new Scanner(System.in);
String input = in.nextLine();

STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
See above. This seems to be a multi-process communication issue.

EXPECTED VERSUS ACTUAL BEHAVIOR :
EXPECTED -
String input should be assigned the value I type at the keyboard followed by Enter.
ACTUAL -
command window locks up

REPRODUCIBILITY :
This bug can be reproduced always.

---------- BEGIN SOURCE ----------
see above - these are input lines to Jshell
---------- END SOURCE ----------