spring报错_org.springframework.web.util.NestedServletException

今天在写实验报告，遇到一个问题
在开启服务器时报404

手动输入地址后报500

仔细看一下500页面的报错信息，发现了这个提示
java.lang.IllegalStateException: Optional int parameter 'cno' is present but cannot be translated into a null value due to being declared as a primitive type. Consider declaring it as object wrapper for the corresponding primitive type.
应该是web.xml中信息有误
检查后发现，在配置前端控制器时候命名不规范， studentmanage应该是dispatcherServlet
<welcome-file>也要修改成对应的名字

<servlet>
  <servlet-name>studentmanage</servlet-name>
  <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
  <init-param>
    <param-name>contextConfigLocation</param-name>
    <param-value>classpath:springmvc-config.xml</param-value>
  </init-param>
  <load-on-startup>1</load-on-startup>
</servlet>
<servlet-mapping>
  <servlet-name>studentmanage</servlet-name>
  <url-pattern>/</url-pattern>
</servlet-mapping>

修改后，Tomcat运行，成功