Spring Roo Addon for deploying to OpenShift Express. Please refer to my blog for installing and creating a Spring MongoDB application http://xebee.xebia.in/2012/01/09/running-spring-java-mongodb-apps-on-openshift-express-using-spring-roo-openshift-express-addon/. You can also refer to my blog for more openshift relate blogs http://whyjava.wordpress.com/tag/openshift/