What is a KJAR? Updated 2018-02-27T19:15:20+00:00 Red Hat JBoss BPM Suite and BRMS both use an artifact packaging known as a "KJAR", or knowledge artifact, since version 6. What is this file type? What separates it from a standard JAR file? Subscriber content preview. For full access to the Red Hat Knowledgebase, please log in.Not a subscriber? Learn more about the benefits of Red Hat Subscriptions.