See

Essentially, it seems we release batched statements after a certain type of exception happens during an insert/update/etc., but for some strange reason we only do that for SQLException, and sometimes JDBC exception. See for example this:

As a result, any other exception (such as StaleStateException) will lead to batched statements not being released: that’s a leak, and while Agroal for example will catch that and release the statement, it will also log pesky warnings. It would be better to release statements correctly ourselves.