java.lang.ClassNotFoundException :xxxxxxx

码的!java.lang.ClassNotFoundException: org.springframework.jdbc.core.RowMapper这个错误搞了半天

因为写的项目是手动建的WEB-INF包,忘了建lib包然后代码一直报错,找不到类!!!!!!!!!!!!!!!!!!

反复修改忘了建lib包用来放jar文件

 

 

28-Sep-2019 12:55:07.451 严重 [http-nio-8080-exec-3] org.apache.catalina.core.StandardWrapperValve.invoke Servlet.service() for servlet [zou.web.servlet.UserListServlet] in context with path [/case] threw exception [Servlet execution threw an exception] with root cause
java.lang.ClassNotFoundException: org.springframework.jdbc.core.RowMapper
at org.apache.catalina.loader.WebappClassLoaderBase.loadClass(WebappClassLoaderBase.java:1308)
at org.apache.catalina.loader.WebappClassLoaderBase.loadClass(WebappClassLoaderBase.java:1136)
at zou.web.servlet.UserListServlet.doPost(UserListServlet.java:19)
at zou.web.servlet.UserListServlet.doGet(UserListServlet.java:26)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:635)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:742)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:231)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:198)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:96)
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:496)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:140)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:81)
at org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:650)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:87)

　　自学这条路真需要勇气啊!