Java. Lang. noclassdeffounderror: COM/opensymphony/xwork2/config/filemanagerprovider

Severe: exception starting filter struts2
Java. Lang. noclassdeffounderror: COM/opensymphony/xwork2/config/filemanagerprovider
At org. Apache. struts2.dispatcher. Dispatcher. init_filemanager (dispatcher. Java: 336)
At org. Apache. struts2.dispatcher. Dispatcher. INIT (dispatcher. Java: 463)
At org. Apache. struts2.dispatcher. Ng. initoperations. initdispatcher (initoperations. Java: 74)
At org. Apache. struts2.dispatcher. Ng. Filter. strutsprepareandexecutefilter. INIT (strutsprepareandexecutefilter. Java: 51)
At org. Apache. Catalina. Core. applicationfilterconfig. getfilter (applicationfilterconfig. Java: 295)
At org. Apache. Catalina. Core. applicationfilterconfig. setfilterdef (applicationfilterconfig. Java: 422)
At org. Apache. Catalina. Core. applicationfilterconfig. <init> (applicationfilterconfig. Java: 115)
At org. Apache. Catalina. Core. standardcontext. filterstart (standardcontext. Java: 3838)
At org. Apache. Catalina. Core. standardcontext. Start (standardcontext. Java: 4488)
At org. Apache. Catalina. Core. containerbase. addchildinternal (containerbase. Java: 791)
At org. Apache. Catalina. Core. containerbase. addchild (containerbase. Java: 771)
At org. Apache. Catalina. Core. standardhost. addchild (standardhost. Java: 546)
At org. Apache. Catalina. startup. hostconfig. deploydirectory (hostconfig. Java: 1041)
At org. Apache. Catalina. startup. hostconfig. deploydirectories (hostconfig. Java: 964)
At org. Apache. Catalina. startup. hostconfig. deployapps (hostconfig. Java: 502)
At org. Apache. Catalina. startup. hostconfig. Start (hostconfig. Java: 1277)
At org. Apache. Catalina. startup. hostconfig. lifecycleevent (hostconfig. Java: 321)
At org. Apache. Catalina. util. lifecyclesupport. firelifecycleevent (lifecyclesupport. Java: 119)
At org. Apache. Catalina. Core. containerbase. Start (containerbase. Java: 1053)
At org. Apache. Catalina. Core. standardhost. Start (standardhost. Java: 785)
At org. Apache. Catalina. Core. containerbase. Start (containerbase. Java: 1045)
At org. Apache. Catalina. Core. standardengine. Start (standardengine. Java: 443)
At org. Apache. Catalina. Core. standardservice. Start (standardservice. Java: 519)
At org. Apache. Catalina. Core. standardserver. Start (standardserver. Java: 710)
At org. Apache. Catalina. startup. Catalina. Start (Catalina. Java: 581)
At sun. Reflect. nativemethodaccessorimpl. invoke0 (native method)
At sun. Reflect. nativemethodaccessorimpl. Invoke (nativemethodaccessorimpl. Java: 39)
At sun. Reflect. delegatingmethodaccessorimpl. Invoke (delegatingmethodaccessorimpl. Java: 25)
At java. Lang. Reflect. method. Invoke (method. Java: 597)
At org. Apache. Catalina. startup. Bootstrap. Start (Bootstrap. Java: 289)
At org. Apache. Catalina. startup. Bootstrap. Main (Bootstrap. Java: 414)
Caused by: Java. Lang. classnotfoundexception: COM. opensymphony. xwork2.config. filemanagerprovider
At org. Apache. Catalina. loader. webappclassloader. loadclass (webappclassloader. Java: 1516)
At org. Apache. Catalina. loader. webappclassloader. loadclass (webappclassloader. Java: 1361)
At java. Lang. classloader. loadclassinternal (classloader. Java: 320)
... 31 more
2013-6-15 8:47:49 org. Apache. Catalina. Core. standardcontext start
Severe: Error filterstart
2013-6-15 8:47:49 org. Apache. Catalina. Core. standardcontext start
Severe: context [/spring_1500_registration_6] startup failed due to previous errors
8:47:49 org. Apache. Catalina. Core. applicationcontext log
Information: Closing spring root webapplicationcontext
8:47:49 org. Apache. Catalina. loader. webappclassloader clearreferencesjdbc
Severe: A web application registered the jbdc driver [COM. mySQL. JDBC. driver] but failed to unregister it when the web application was stopped. to prevent a memory leak, the JDBC driver has been forcibly unregistered.
8:47:49 org. Apache. Catalina. loader. webappclassloader clearreferencesstoptimerthread
Severe: A web application appears to have started a timerthread named [Timer-0] via the java. util. timer API but has failed to stop it. to prevent a memory leak, the timer (and hence the associated thread) has been forcibly canceled.

Log4j: Error logmananger. repositoryselector was null likely due to error in class reloading, using noploggerrepository.

The reason is that I changed the struts2-core-2.1.6.jar and struts2-spring-plugin-2.1.6.jar to version 2.3.8. I wanted to replace it with a new version. I couldn't think of this error.