What is Mirror in Maven settings.xml file?
<p>Correct me if I'm wrong, but a Mirror is used to redirect all traffic to a specific repository URL and block everything else (including Maven central repo).</p>

<p>Now what if I have a Mirror to <code>http://a.com:8081</code> and a repository to <code>http://b.com:8081</code>. Would the second URL ever get used? I assume the answer is a No. Can you have multiple Mirrors?</p>