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1.FormManager,java load workgroupForm: xstream have Type limit.must set allowTypes when xstream update 1.4.20
2.Request.java: when chatbot.enabled =false default. chatBot is null so throw NLP exception.
3.WorkgroupUtils.java when set custom dispatchers must in the first of dispatcher List. because RequestQueue.java gets first dispather to the default dispather class in dispatcher List.