com.mysql.jdbc.exceptions.jdbc4.CommunicationsException: Communications link failure The last packet successfully received from the server was 240,502 milliseconds ago. The last packet sent successfully to the server was 1 milliseconds ago.

com.mysql.jdbc.exceptions.jdbc4.MySQLNonTransientConnectionException: No operations allowed after connection closed.Connection was implicitly closed by the driver. 番号 タイトル 掲載日 照会