I downloaded b89 and tried JShell, there is a show stopper with completion

When I type pri<tab>, I have to wait at least 30 seconds to see any completion happening.

And that is every time, not just the very first time.

Same if I type Syst<tab>, takes a long time.

I've pasted the thread dump below. See the issue in thread named: "main", which appears to be the culprit.

Thanks,
Michel