There is a iText 7.0.7 method of table that works:
Table table = new Table(new float [] {4,1,3,4,3,3,3,3,1});
table.setWidthPercent(100);
But in iText 7.1.2 this method is not found:
table.setWidthPercent(100);
They know what the new method is or where it has moved, please.