use https for maven central
use https for maven central

Maven central moved to HTTPS and returns HTTP 501 on HTTP requests.
https://blog.sonatype.com/central-repository-moving-to-https

IronJacamar build then fails with errors like:
[ivy:retrieve]  SERVER ERROR: HTTPS Required url=http://repo1.maven.org/maven2/org/apache/ant/ant/1.8.1/ant-1.8.1.jar

ironjacamar/ironjacamar,ironjacamar/ironjacamar,ironjacamar/ironjacamar