This is the error message shown in the java console
2018-11-29 13:50:16.942 java[36152:2928641] *** Assertion failure in -[NSEvent _initWithCGEvent:eventRef:], /BuildRoot/Library/Caches/com.apple.xbs/Sources/AppKit/AppKit-1671/AppKit.subproj/NSEvent.m:1969
java.io.IOException: Server returned...