Weld has Undertow integration, but our test for injection into servlet components uses very old Undertow version. With newer version, this actually fails for listeners as those are eagerly created before we have a chance to boostrap and start providing instances of listeners.

This is IMO a bug on Undertow side, for which I've created UNDERTOW-1772 issue and sent a PR.
On Weld side we'll need to update the Undertow version used for the test, update the test itself to register EnhancedListener and note this in release notes.
Here is a branch that shows how to update the test - undertowTestUpdate branch.