KieBuilder kbuilder = ks.newKieBuilder(kfs);
kbuilder.buildAll();
assertEquals(0, kbuilder.getResults().getMessages().size());
KieBaseConfiguration conf = ks.newKieBaseConfiguration();
conf.setOption(RuleEngineOption.RETEOO);
KieBase kbase = ks.newKieContainer(kbuilder.getKieModule().getReleaseId()).newKieBase(conf);
KieSession ksession = kbase.newKieSession();
ksession.fireAllRules();
}