this is a really good point. Of course, the preferred way in Drools 6 to configure both KieBases and KieSessions should be through the kmodule.xml. Anyway I am realizing we are not providing a way in kie-api  to create a KieBaseConfiguration or KieSessionConfiguration programmatically. At the moment the only way to create them is using the KnowledgeBaseFactory that however is part of the old api and for this reason is in kie-internal so it shouldn't be intended to be invoked by end-users.