When binding Wildfly to an ephemeral port (i.e., by specifying port 0), Wildfly does not log the port that it actually binds to, but instead logs the port as 0.

09:11:18,955 INFO [org.wildfly.extension.undertow] (MSC service thread 1-1) WFLYUT0006: Undertow HTTP listener default listening on 127.0.0.1:0

Instead, Wildfly should log the ephemeral port that it actually bound to:

09:11:58,769 INFO [org.wildfly.extension.undertow] (MSC service thread 1-7) WFLYUT0006: Undertow HTTP listener default listening on 127.0.0.1:52928