Mysqlnontransientconnectionexception:no operations allowed after statement closed hibernate

The first is to add a parameter after the DB connection string.

In this case, if the current link is broken due to a timeout, the driver will automatically reconnect to the database.

Jdbc:mysql://localhost:3306/makhtutat?autoreconnect=true

Now the problem is out of the autoreconnect=true, changed to false after the problem solved.

Mysqlnontransientconnectionexception:no operations allowed after statement closed hibernate