I was trying to run Weld servlet tests on Tomcat 9 embedded utilizing arquillian-container-tomcat.

Turns out this doesn't work because starting with Tomcat 9 there are no default connectors registered (e.g. Tomcat starts up and listens on no port) hence subsequent test execution fails.

As a fix a one-liner can be added to version 8 codebase - it causes no harm for Tomcat 8 and fixes Tomcat 9. I'll send a PR momentarily.

Just FYI, link to Tomcat BZ which issued this change.