The Gartner Magic Quadrant has documented the new database landscape and how that landscape has changed. Last year marked a sea change as the 2014 Magic Quadrant became the first year EDB, as an open source relational database management system, was named a Leader. This year, EDB was again named a Leader. In fact, EDB is the only relational database vendor in the Leaders Quadrant that delivers both an open source and an enterprise-enhanced, open source based database solution that can be deployed on-premises or in the cloud. - See more here.

EDB Postgres and Red Hat JBoss do have joint customers