The problem was the file ssl-domain-service.xml.
Following the WiKi, I named the file ssl-domain.xml.
Some frustrating days after my first try I had a look at the attachments in the Wiki, there the file was named ssl-domain-service.xml
After I renamed it to ssl-domain-service.xml, JBoss started without any problems.
Maybe someone responsible for the Wiki should correct this, could be a annoying experience for someone new to JBoss like me.
Any user with a login can edit the wiki to correct such issues. I have corrected this however.