The combination of the nxrm3-maven-plugin (required for staged deployment workflows when JBoss Nexus moves to Nexus 3) and the maven-gpg-plugin (required for artifact signing required to sync artifacts to Maven Central when JBoss Nexus moves to Nexus 3) fails for modules with plugins that attach zips to the project without any classifier. This is because the maven-gpg-plugin attaches the zip signature the project with an empty string classifier, and nxrm3-maven-plugin rejects such an artifact.

Work around this by changing the modules that attach zips with no classifier such that they instead publish the zip file as the file for the main project artifact.