kiesession startprocess stackoverflow hashmap

this is my processMain code: public class ProcessMain { public static final void main(String[] args) throws Exception { KieSession ksession = createKieSession(); Map<String, Object> params = new HashMap<String, Object>(); params.put("action", "CreateAgent"); ksession.startProcess("InterfaceLayer.bpmn",params); ksession.dispose(); } private static KieSession createKieSession() { KnowledgeBuilder kbuilder = KnowledgeBuilderFactory.newKnowledgeBuilder(); kbuilder.add(ResourceFactory.newClassPathResource("InterfaceLayer.bpmn"), ResourceType.BPMN2); KieBase kbase = kbuilder.newKnowledgeBase(); return kbase.newKieSession(); } }