findbugs reported:
unread field in javafx.embed.swt.FXCanvas$HostContainer$2, line 737
The field is transferData, which is assigned to DropTargetEvent.dataTypes but is never read.
unread field in javafx.embed.swt.FXCanvas$HostContainer$2, line 737
The field is transferData, which is assigned to DropTargetEvent.dataTypes but is never read.