config.setProperty("drools.resource.scanner.interval", "1");
ResourceFactory.getResourceChangeScannerService().configure(config);
// create knowledge agent
KnowledgeAgent kagent = KnowledgeAgentFactory.newKnowledgeAgent("xls agent");
kagent.applyChangeSet(ResourceFactory.newFileResource(xlsChangeset));
KnowledgeBase kbase = kagent.getKnowledgeBase();
// ---------------------------------------------------------------
// start scanning service - scanner's thread throws exception here
// ---------------------------------------------------------------