Using Maven to deploy to Maven Central

mvn-deploy.sh

mvn -s settings.xml clean javadoc:jar source:jar gpg:sign -Dgpg.passphrase=your_passphrase deploy

mvn-install.sh

mvn clean javadoc:jar source:jar gpg:sign -Dgpg.passphrase=your_passphrase install

pom-distributionManagement.xml

<distributionManagement>
  <repository>
    <id>sonatype</id>
    <url>https://oss.sonatype.org/service/local/staging/deploy/maven2</url>
  </repository>
</distributionManagement>

pom-plugins.xml

<build>
  <plugins>
    <plugin>
      <groupId>org.apache.maven.plugins</groupId>
      <artifactId>maven-javadoc-plugin</artifactId>
      <executions>  
        <execution>
          <id>attach-javadocs</id>
          <goals>
            <goal>jar</goal>
          </goals>
        </execution>
      </executions>
    </plugin>
    <plugin>
      <artifactId>maven-source-plugin</artifactId>
      <executions>
        <execution>
          <id>attach-sources</id>
          <goals>
            <goal>jar</goal>
          </goals>
        </execution>
      </executions>
    </plugin>
  </plugins>
</build>

settings.xml

<settings xmlns="http://maven.apache.org/SETTINGS/1.0.0"
  xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
  xsi:schemaLocation="http://maven.apache.org/SETTINGS/1.0.0
                      http://maven.apache.org/xsd/settings-1.0.0.xsd">
  <servers>
    <server>
      <id>sonatype</id>
      <username>your_username</username>
      <password>your_password</password>
    </server>
  </servers>

</settings>