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publish_to_maven_central.md

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This is my first project that I publish in Maven central.

Workflow

Release to maven consists of two steps:

  1. artifact is pushed to https://oss.sonatype.org/#nexus-search;quick~phip1611
  2. they push it further to maven central

Current POM must contain a snapshot versions for a release! https://stackoverflow.com/questions/20054185/you-dont-have-a-snapshot-project-in-the-reactor-projects-list-when-using-jen -> replacement to next release-version is automatically done during "mvn release:prepare"

Maven doesn't care about branches. Release can be done from "any" branch.

Setup

  1. (ONCE) I created an account on sonatype.org (they work as distributor into maven central) https://issues.sonatype.org/browse/OSSRH-60727
  2. (PER MACHINE) I added login data in $HOME/.m2/settings.xml 
    <settings>
    <servers>
        <server>
            <!-- publishing to maven central-->
            <!-- via: https://issues.sonatype.org/browse/OSSRH-60727-->
            <id>ossrh</id>
            <username>phip1611</username>
            <password>****</password>
        </server>
    </servers>
</settings>
  3. (ONCE; COPY KEY TO OTHER MACHINES AND ADD IT TO GPG) I created a gpg key on my Mac (don't forget to bac it up!) public ID: 
    pub   rsa3072 2020-09-17 [SC]
                              389BB8340DA168D0
      D21DE8C7C1BE873DD10DCB13389BB8340DA168D0
uid                      Philipp Schuster (Maven Central publishing) <[email protected]>
sub   rsa3072 2020-09-17 [E]
  4. (PER MACHINE) add gpg key to $HOME/.m2/settings.xml 
    <profiles>
    <profile>
        <id>ossrh</id>
        <activation>
            <activeByDefault>true</activeByDefault>
        </activation>
        <properties>
             <!-- password for key: D21DE8C7C1BE873DD10DCB13389BB8340DA168D0
                  on local machine (in gpg keystore) -->
             <gpg.passphrase>****</gpg.passphrase>
        </properties>
    </profile>
</profiles>
  5. (ONCE) send pgp key to pgp.mit.edu server: gpg --keyserver pgp.mit.edu --send-key 389BB8340DA168D0 (didn't worked during mvn release:perform) gpg --keyserver keys.openpgp.org:11371 --send-key 389BB8340DA168D0
  6. (PER RELEASE) execute sh release.sh