Do you own the domain rakugakibox.net? If not, please read:
You may also choose a groupId that reflects your project hosting, in this case, something like com.github.akihyro
Today, I created the domain "rakugakibox.net".
This url is my web site: http://rakugakibox.net (redirect)
Configuration has been prepared, now you can:
I have just promoted my first release:
Central sync is activated for net.rakugakibox. After you successfully release, your component will be published to Central, typically within 10 minutes, though updates to search.maven.org can take up to two hours.