In order to create a release of project artifacts and publish to maven central repo follow these steps:

• prepare the release (run tests, etc.)

• remove SNAPSHOT from versions in top-level POM

• commit the changes

• create a tag git tag -a releases/X.Y.Z -m "tagged X.Y.Z"

• perform a build for deployment (you need the PGP key and pgp/gpg installed) mvn clean deploy -P mmm.deploy

• go to OSS Nexus and login to verify that the deployed bundle appears in the queue

• click on close to verify and close the queue

• click on release to release the queue so it will be staged to central

• For further details see OSSRH guide