struts2 jar包导入Unable to load configuration. - bean问题 （404 源服务器未能找到目标资源的表示或者是不愿公开一个已经存在的资源表示。）

用eclipse配置好了struts2，一运行tomcat就报错，我这里原因是我吧struts2的jar包都放进去了，太多了所以报错，然后我去掉了大部分留下几个核心jar包，还是报错，

java.lang.NoClassDefFoundError: com/opensymphony/xwork2/ActionContext
at org.apache.struts2.dispatcher.ng.InitOperations.cleanup(InitOperations.java:114)
at org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter.init(StrutsPrepareAndExecuteFilter.java:69)
at org.apache.catalina.core.ApplicationFilterConfig.initFilter(ApplicationFilterConfig.java:283)
at org.apache.catalina.core.ApplicationFilterConfig.getFilter(ApplicationFilterConfig.java:264)
at org.apache.catalina.core.ApplicationFilterConfig.<init>(ApplicationFilterConfig.java:108)
at org.apache.catalina.core.StandardContext.filterStart(StandardContext.java:4546)
at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5191)
at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:183)
at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1412)
at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1402)
at java.base/java.util.concurrent.FutureTask.run(FutureTask.java:264)
at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1128)
at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:628)
at java.base/java.lang.Thread.run(Thread.java:830)
Caused by: java.lang.ClassNotFoundException: com.opensymphony.xwork2.ActionContext
at org.apache.catalina.loader.WebappClassLoaderBase.loadClass(WebappClassLoaderBase.java:1358)
at org.apache.catalina.loader.WebappClassLoaderBase.loadClass(WebappClassLoaderBase.java:1180)
... 14 more

原因是jar包不够，在Console可以看到具体缺少什么，这里从第一行可以看出缺少xwork2，再导入，然后就可以正常运行了。