Urgent: Can't get REPL to work anymore (for a live demo!)

[Roy van Rijn]

Tomorrow I've offered to do some live coding at a conference and show the
new REPL.
But when I did a clean install this afternoon as a test I suddenly got a
REPL that didn't work. So panic is starting to come in...!

This is what I now get:

roy:repl royvanrijn$ ./scripts/run.sh
|  Unexpected exception reading start-up: java.lang.NullPointerException

|  Welcome to JShell -- Version 0.610
|  Type /help for help

-> System.out.println("Test");
Exception in thread "main" java.lang.NullPointerException
at jdk.internal.jshell.impl.JDIExecution.commandExit(JDIExecution.java:79)
at jdk.internal.jshell.impl.JShellImpl.close(JShellImpl.java:139)
at jdk.internal.jshell.tool.JShellTool.closeState(JShellTool.java:351)
at jdk.internal.jshell.tool.JShellTool.start(JShellTool.java:222)
at jdk.internal.jshell.tool.JShellTool.start(JShellTool.java:198)
at jdk.internal.jshell.tool.JShellTool.main(JShellTool.java:188)

Any ideas on how I can fix this? I've looked at the recent checkins in hg,
but couldn't find anything related....?