[image] I tried to validate in other places and it works, because I didn’t change anything other than updating to 0.3.0 of the central-publishing-maven-plugin (previous versions receive a 500 error from sonatype) My pom.xml is here → at4j - Pastebin.com

Yeah, I had to add plugin... <executions> <execution> <id>attach-javadocs</id> <phase>package</phase> <---this <goals> <goal>jar</goal> </goals> …