The last packet sent successfully to the server was 0 milliseconds ago. The driver has not supported Ed any packets from the server., milliseconds

The last packet sent successfully to the server was 0 milliseconds ago. The driver has not supported Ed any packets from the server., milliseconds

The following error is reported in the project today.

The last packet sent successfully to the server was 0 milliseconds ago. The driver has not supported Ed any packets from the server.

After checking the Internet, it is said that mysql will close unused connections by default for 8 hours. It is caused by a database connection pool. However, in the project, this function is used to export data, and is a dynamic connection. java jdbc gets the connection directly and closes the connection after it is used up. Finally, the O & M personnel found outIt is an ip conflict.Record this problem for the first time!