由于struts低版本有漏洞，公司要求升级到2.3.32，pom.xml中修改过版本后，运行tomcat报错SEVERE: Error filterStart，网上查了有很多说法，都不成功，最后发现localhost.2017-03-09.log 这个日志中有报错：
java.lang.NoSuchFieldError: VERSION_2_3_0 at org.apache.struts2.views.freemarker.FreemarkerManager.createConfiguration(FreemarkerManager.java:331) at org.apache.struts2.views.freemarker.FreemarkerManager.init(FreemarkerManager.java:282) at org.apache.struts2.views.freemarker.FreemarkerManager.getConfiguration(FreemarkerManager.java:269) at org.apache.struts2.dispatcher.DefaultDispatcherErrorHandler.init(DefaultDispatcherErrorHandler.java:47) at org.apache.struts2.dispatcher.Dispatcher.init(Dispatcher.java:488) at org.apache.struts2.dispatcher.ng.InitOperations.initDispatcher(InitOperations.java:74) at org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter.init(StrutsPrepareAndExecuteFilter.java:57) at 然后百度一把，感谢http://www.cnblogs.com/lr393993507/p/5466476.html 文章指出了解决方法，更新freemarker 到2.3.23，然后重新编译，部署，一切正常~