错误信息:'servlet.BookServlet' is not assignable to 'javax.servlet.Servlet' less... (Ctrl+F1)
Inspection info: This inspection lets you spot the following problems that might occur in descriptors that are used to deploy your Web Module to a server:
我把 这些依赖删了web.xml配置那里就不报错了,但是servlet哪里又错找不到 servlet-jsp jar.包