严重: Exception starting filter struts2 --Unable to load configuration

1. 严重: Exception starting filter struts2
2. Unable to load configuration. - [unknown location]
3. at com.opensymphony.xwork2.config.ConfigurationManager.getConfiguration(ConfigurationManager.java:58)
4. at org.apache.struts2.dispatcher.Dispatcher.init_PreloadConfiguration(Dispatcher.java:371)
5. at org.apache.struts2.dispatcher.Dispatcher.init(Dispatcher.java:424)
6. at org.apache.struts2.dispatcher.FilterDispatcher.init(FilterDispatcher.java:213)
7. at org.apache.catalina.core.ApplicationFilterConfig.getFilter(ApplicationFilterConfig.java:275

tomcat  和struts2 版本不兼容造成的

       我的解决办法是 struts2  2.1.6  ---> 删除掉  选择

我的解决办法是  

struts2  2.1.8  网页可以正常运作出来  

但是   出现了空的异常   

我的解决办法是  

SEVERE: Exception starting filter struts2

java.lang.NullPointerException

at com.opensymphony.xwork2.util.FileManager$FileRevision.needsReloading(FileManager.java:209)

at com.opensymphony.xwork2.util.FileManager.fileNeedsReloading(FileManager.java:60)

at com.opensymphony.xwork2.config.providers.XmlConfigurationProvider.needsReload(XmlConfigurationProvider.java:325)

at org.apache.struts2.config.StrutsXmlConfigurationProvider.needsReload(StrutsXmlConfigurationProvider.java:168)

at com.opensymphony.xwork2.config.ConfigurationManager.conditionalReload(ConfigurationManager.java:220)

at com.opensymphony.xwork2.config.ConfigurationManager.getConfiguration(ConfigurationManager.java:61)

at org.apache.struts2.dispatcher.Dispatcher.getContainer(Dispatcher.java:819)

at org.apache.struts2.dispatcher.ng.InitOperations.initStaticContentLoader(InitOperations.java:77)

at org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter.init(StrutsPrepareAndExecuteFilter.java:52)

at org.apache.catalina.core.ApplicationFilterConfig.initFilter(ApplicationFilterConfig.java:279)

at org.apache.catalina.core.ApplicationFilterConfig.getFilter(ApplicationFilterConfig.java:260)

at org.apache.catalina.core.ApplicationFilterConfig.<init>(ApplicationFilterConfig.java:105)

at org.apache.catalina.core.StandardContext.filterStart(StandardContext.java:4830)

at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5510)

at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150)

at org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:901)

at org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:877)

at org.apache.catalina.core.StandardHost.addChild(StandardHost.java:649)

at org.apache.catalina.startup.HostConfig.deployDirectory(HostConfig.java:1245)

at org.apache.catalina.startup.HostConfig$DeployDirectory.run(HostConfig.java:1895)

at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:471)

at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:334)

at java.util.concurrent.FutureTask.run(FutureTask.java:166)

at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)

at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)

at java.lang.Thread.run(Thread.java:722)

这个问题 我思考下

我的解决办法是