fix(registration): correctly annotate with JMX port number

[andrewazores]

Fixes #153

[tthvo]

Looks good! Fixed the issue (PORT annotation?).

Wondering why previously it does not behave correctly as it seemed to work?

[andrewazores]

$ jshell
|  Welcome to JShell -- Version 17.0.7
|  For an introduction type: /help intro

jshell> URI.create("service:jmx:rmi:///jndi/rmi://localhost:1234/jmxrmi")
$1 ==> service:jmx:rmi:///jndi/rmi://localhost:1234/jmxrmi

jshell> URI.create("service:jmx:rmi:///jndi/rmi://localhost:1234/jmxrmi").getPort()
$2 ==> -1

jshell> URI.create("service:jmx:rmi:///jndi/rmi://localhost:1234/jmxrmi").getSchemeSpecificPart()
$3 ==> "jmx:rmi:///jndi/rmi://localhost:1234/jmxrmi"

The JMX service URL format's port number is not actually the URI's port number, but embedded within the "scheme-specific part" of the URI. So, the regular .getPort() method simply returns -1 instead of what would be expected as the JMX port number. The rest of everything in this call chain works fine and puts the value into the right place, I just overlooked that this value will be wrong in the "prefer JMX" case.

[tthvo]

Ahh okayy that makes sense! Thanks for explaining!