my rule just like this:
==================java code=====================
......
StatefulKnowledgeSession statefulKSession = kbase.newStatefulKnowledgeSession();
Map valueMap = new HashMap();
valueMap.put("year", "2012");
valueMap.put("cost", "88");
// valueMap.put("contactCarryFlag", "1");
statefulKSession.setGlobal("g_paramMap", paramMap);
// statefulKSession.insert(paramMap);
statefulKSession.insert(valueMap);
statefulKSession.fireAllRules();