Why does autoReconnect=true not seem to work?

I had the same issue and it was absolutely maddening. Here's what the docs say on the MySQL website (emphasis mine).

I had the same issue and it was absolutely maddening. Here's what the docs say on the MySQL website (emphasis mine) *Should the driver try to re-establish stale and/or dead connections? If enabled the driver will throw an exception for a queries issued on a stale or dead connection, which belong to the current transaction, but will attempt reconnect before the next query issued on the connection in a new transaction.

The use of this feature is not recommended, because it has side effects related to session state and data consistency when applications do not handle SQLExceptions properly, and is only designed to be used when you are unable to configure your application to handle SQLExceptions resulting from dead and stale connections properly. Alternatively, investigate setting the MySQL server variable "wait_timeout" to some high value rather than the default of 8 hours. * In my experience, it doesn't seem like the "reconnect on the next query" functionality worked either, but I was using MySQL 4.0, which may have been the reason for that.

I ended up writing a mini-framework that catches the exceptions, checks for that specific error, and attempts to reconnect and retry the query if possible. ETA: This link provides a bit more information, and indicates that autoReconnect will probably be removed in the future anyways.

AutoReconnect still throws the exception so you can choose to do something about the situation if you like. If you catch it, you should find that the connection is there again afterward. (There's some more complexity if you're in a transaction -- your current transaction is pretty much dead.).

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