I tried building the project using Maven Bundle Plugin 3.5.0 and it failed with this error:
Manifest org.jboss.xnio:xnio-api:jar:3.6.2.Final : Header contains name field after attribute or directive: null from osgi.service;effective:=active;filter:="(objectClass=org.xnio.Xnio)";. Name fields must be consecutive, separated by a ';' like a;b;c;x=3;y=4
After a quick investigation I found that removing the trailing semicolon at the "Require-Capability" rule solves the problem. I attached the patch here.
Well, now I wonder why Maven is not pulling the latest version of this plugin...