I have a simple cell with

for (int i = 0; i < 20; i++) { System.out.println(i); Thread.sleep(1000); }

I hit the interrupt button in Jupyter expecting it will interrupt the command.
However the cell runs to completion and prints this in the console output:

[I 13:47:24.582 NotebookApp] Kernel interrupted: bcb8133c-58d3-4727-911c-2fca4dc40d5b
Sep 20, 2018 1:47:24 PM io.github.spencerpark.jupyter.channels.ShellChannel lambda$bind$16
SEVERE: Unhandled message: none