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报错【The last packet sent successfully to the server was 0 milliseconds ago】
The last packet sent successfully to the server was 0 milliseconds ago. The driver has not received any packets from the server.at com.mysql.cj.jdbc.exceptions.SQLError.createCommunicationsException(S
用户管理系统之增删改查操作
①创建index.jsp用户管理系统查询所有用户信息列表查②创建FindAllServlet@WebServlet(urlPatterns = “/findAllServlet”)public class FindAllServlet extends HttpServlet{protected void doGet(HttpServletRequest req, HttpServletRespon
Kafka配置broker映射错误报错Discovered coordinator xxx rack: null
出现下述报错且一直刷：Discovered coordinator tbds-172-16-122-43:6667 (id: 2147482646 rack: null) 2原因是hosts映射没配置好：C:\Windows\System32\drivers\etc改成这样既可注意换行！！！
到底了