The server encountered an unexpected condition that prevented it from fulfilling the request.
新手在学Servlet，做黑马的一个小案例出现一下问题
html文件可以打开，但是在从servlet 跳转到另一个servlet的时候遇到：
Type Exception Report
Message Servlet execution threw an exception
Description The server encountered an unexpected condition that prevented it from fulfilling the request.
Exception
javax.servlet.ServletException: Servlet execution threw an exception
org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
Root Cause
java.lang.NoClassDefFoundError: org/springframework/dao/DataAccessException
web.servlet.LoginServlet.doGet(LoginServlet.java:26)
web.servlet.LoginServlet.doPost(LoginServlet.java:41)
javax.servlet.http.HttpServlet.service(HttpServlet.java:661)
javax.servlet.http.HttpServlet.service(HttpServlet.java:742)
org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
Root Cause
java.lang.ClassNotFoundException: org.springframework.dao.DataAccessException
org.apache.catalina.loader.WebappClassLoaderBase.loadClass(WebappClassLoaderBase.java:1308)
org.apache.catalina.loader.WebappClassLoaderBase.loadClass(WebappClassLoaderBase.java:1136)
web.servlet.LoginServlet.doGet(LoginServlet.java:26)
web.servlet.LoginServlet.doPost(LoginServlet.java:41)
javax.servlet.http.HttpServlet.service(HttpServlet.java:661)
javax.servlet.http.HttpServlet.service(HttpServlet.java:742)
org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
Note The full stack trace of the root cause is available in the server logs.
谁能想到这样复杂的错误提示
结果源于我在WEB-INF到jar包的时候
把文件夹的名字lib写成了libs
我寻思这么多个jar包 加个s没问题吧
这让我头大了一个小时