Sorry, it seems to me I guess what's wrong. I tried to build project from source in workspace, and added seam jars not entirely, "on demand" by compilation problems. Whereas the classic seam project created by seam-gen (Eclipse "Seam Web Project" tab) loads all them in Web App Libraries. So all I need is to create seam project from scratch by jboss-tools and put existing source in it, flood over, so say, no idea how it should sound in english. Yes?