- Create an actor
- open the object inspector for that actor
- Reset or change the code and recompile while having the object inspector still open
This will throw an exception: java.lang.IllegalStateException: Not on FX application thread
Tested on Mac and Windows.
In BlueJ / former Greenfoot-versions the object inspector is / was closed when the code was compiled. I guess this is the way it should be.
Reported by Thomas Karp.