private static KnowledgeBase readKnowledgeBase(String drlFileName) {
KnowledgeBuilder kbuilder = KnowledgeBuilderFactory.newKnowledgeBuilder();
String configDir = CarbonUtils.getCarbonConfigDirPath();
Resource resource = ResourceFactory.newFileResource(configDir + File.separator + drlFileName );
kbuilder.add(resource, ResourceType.DRL);
KnowledgeBuilderErrors errors = kbuilder.getErrors();
if (errors.size() > 0) {
for (KnowledgeBuilderError error: errors) {
log.error(error.getMessage());