无法创建PoolableConnectionFactory

Question

问题是什么？无法连接数据库？

   org.apache.commons.dbcp.SQLNestedException: Cannot create PoolableConnectionFactory (
            Communications link failure 
    The last packet sent successfully to the server was 0 milliseconds ago. The driver has not received any packets from the server.)

Answer 1

这是问题的真正原因:

引起:com.mysql.jdbc.exceptions.jdbc4.CommunicationsException:通信链路故障

您有数据库通信链接问题.确保您的应用程序具有对数据库的网络访问权限(并且防火墙不会阻止数据库的端口).

Answer 2

我localhost在源 URL 中遇到了同样的问题。我用127.0.0.1而不是localhost.