I've created a possible solution to be able to create UL lists with Errai-UI, but before I push it to the main branch could you guys have a look at it? Because I'm not sure if this is a nice solution.

What I intended to do is create a specialised ListWidget that creates a UL element instead of a table. But when I was implementing it I found that it could be as simple as having a classifier. Any way have a look at the the commit https://github.com/edewit/errai/commit/4ab18e8637bfc594f457a2d7ceefe14354918223