ac = (org.nutz.mvc.ActionContext) {javax.servlet.http.HttpServletRequest=org.apache.catalina.connector.RequestFacade@9379e0e, nutz.mvc.module=main.oltAction@3bd72989, nutz.mvc.path.suffix=, nutz.mvc.error=org.nutz.dao.DaoException: java.lang.NullPointerException, javax.servlet.http.HttpServletResponse=org.apache.catalina.connector.ResponseFacade@7b8360de, javax.servlet.ServletContext=org.apache.catalina.core.ApplicationContextFacade@927979e, nutz.mvc.method.args=[Ljava.lang.Object;@74e24386, nutz.mvc.pathArgs=[], nutz.mvc.method=public java.lang.Object main.oltAction.hbhwdata(), nutz.mvc.path=/vlanolt/hbhwdata, nutz.mvc.refer_object=null}

报有空值？