运行第一个页面index.jsp跳转到http://localhost:8080/jdondemo/userListAction.do?count=5

之后出现如下错误，初次使用，还望指教。

java.lang.NoClassDefFoundError

com.jdon.strutsutil.InitPlugIn.getConfigs(InitPlugIn.java:92)

com.jdon.strutsutil.InitPlugIn.init(InitPlugIn.java:74)

org.apache.struts.action.ActionServlet.initModulePlugIns(ActionServlet.java:1158)

org.apache.struts.action.ActionServlet.init(ActionServlet.java:473)

javax.servlet.GenericServlet.init(GenericServlet.java:211)

org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:105)

org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:148)

org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:869)

org.apache.coyote.http11.Http11BaseProtocol$Http11ConnectionHandler.processConnection(Http11BaseProtocol.java:664)

org.apache.tomcat.util.net.PoolTcpEndpoint.processSocket(PoolTcpEndpoint.java:527)

org.apache.tomcat.util.net.LeaderFollowerWorkerThread.runIt(LeaderFollowerWorkerThread.java:80)

org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:684)

java.lang.Thread.run(Thread.java:595)