mysql database connection timeout problem (no replies)

hello every one,I recently studied the server , and recently discovered that when the server is idle, it has exceeded the default 8 hours of connecting to the Mysql database.
Will produce this error message:
error loading characters internalcom.mysql.jdbc.exceptions.jdbc4.Communications
Exception: The last packet successfully received from the server was 235,283,552
milliseconds ago. The last packet sent successfully to the server was 235,283,552 milliseconds ago. is longer than the server configured value of 'wait_timeout'. You should consider either expiring and/or testing connection validity before
use in your application, increasing the server configured values for client tim
eouts, or using the Connector/J connection property 'autoReconnect=true' to avoid this problem.

error updating login statecom.mysql.jdbc.exceptions.jdbc4.Communications Exception: The last packet successfully received from the server was 241,131,104 millise
conds ago. The last packet sent successfully to the server was 241,131,104 milliseconds ago. is longer than the server configured value of 'wait_timeout'. You should consider either expiring and/or testing connection validity before use in your application, increasing the server configured values for client timeouts,or using the Connector/J connection property 'autoReconnect=true' to avoid this problem.

I also used "autoReconnect=true" in the Settings.ini file, and the problem was the same. So I hope you guys can help me give me some advice, thank you.
By the way, the currently used mysql version is version 5.051.