Problem with SWT on the newest macOS (Developer Installation)
If you happen to have a problem with your Developer installation on macOS mojave, that is related to the SWT plugin, then this might help you:
https://bugs.eclipse.org/bugs/show_bug.cgi?id=538377
Adding “-nosplash” to the program arguments in the run config works around the problem.
In this ticket, this configuration change should be implemented in the Oomph configuration such that new installations work out of the box.
(from redmine: issue id 3592, created on 2018-12-11, closed on 2019-09-30)