servlet运行“/*”引起的java.lang.StackOverflowError

     <servlet>
         <servlet-name>login</servlet-name>
         <servlet-class>com.jd.login.UI.LoginUIServlet</servlet-class>
     </servlet>
     <servlet-mapping>
         <servlet-name>login</servlet-name>
         <url-pattern>/*</url-pattern>
     </servlet-mapping>

若将servlet的url-pattern配置为“/*”时会拦截内部所有请求，使所有请求都由com.jd.login.UI.LoginUIServlet来处理，所以当项目跑起来后会出现栈溢出错误：java.lang.StackOverflowError

 @WebServlet(name = "LoginUIServlet",value="/servlet/LoginUIServlet")
 public class LoginUIServlet extends HttpServlet {
     protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        //出现死循环，因为所有请求都被拦截
        request.getRequestDispatcher("/WEB-INF/pages/login.jsp").forward(request,response);
     }

     protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
         this.doPost(request,response);
     }
 }

栈溢出异常如下：

解决：

将web.xml中的servlet的url-pattern配置为具体的路径

     <servlet>
         <servlet-name>login</servlet-name>
         <servlet-class>com.jd.login.UI.LoginUIServlet</servlet-class>
     </servlet>
     <servlet-mapping>
         <servlet-name>login</servlet-name>
         <url-pattern>/servlet/LoginUIServlet</url-pattern>
     </servlet-mapping>

检验：

在浏览器中输入localhost/servlet/LoginUIServlet，结果如下

备注：在IDEA中跑起来的web项目，在浏览器中访问不要添加应用名称。