org.apache.jasper.JasperException: xxxx.jsp(118,24) Attribute style invalid for tag formatNumber according to TLD

错误：org.apache.jasper.JasperException: /projm/projBudgetChangeOverview.jsp(118,24) Attribute style invalid for tag formatNumber according to TLD
原因：1、在struts标签里添加了struts不支持的属性或者某个属性名写错了;2、没有引用sturts2对应的标签库;3、jar没build;4、监听服务没启动