Does anyone have any recommendation for an open source solution for a robust CMS application that has a fully featured ECommerce module? I have been looking into Drupal with Ubercart -- but it looks like Ubercart is not fully up to speed with Drupal 7, and the other modules for Ecommerce don't look as robust. The CMS system should support CMIS as both client and server, and be able to run in a cloud computing environment.
The system could be written in any standard web programming language, although Java would be my preference. I'm posting this question here because it seems that all CMS systems provide ECommerce as an afterthought, rather than a core feature.