The pom file deployed for the Confluence jar module, http://repository.atlassian.com/maven2/com/atlassian/confluence/confluence/2.5.6/confluence-2.5.6.pom, has an artifact id like this:

<artifactId>${confluence.artifactId}</artifactId>

This property is specified in the parent. It is okay when accessing it from a maven client, but it breaks other software such as artifactory.