MismatchedEventManager example

public static function createInstance(
        Connection $conn,
        Configuration $config,
        ?EventManager $eventManager = null,
        ?QueryOperatorValidator $operatorValidator = null
    ) {
        if (!$config->getMetadataDriverImpl()) {
            throw new MissingMappingDriverImplementation();
        }

        if ($eventManager !== null && $conn->getEventManager() !== $eventManager) {
            throw new MismatchedEventManager();
        }

        if ($operatorValidator === null) {
            $operatorValidator = new QueryOperatorValidator();
        }

        return new self($conn, $config, $operatorValidator);
    }

    /** * @return DBALQueryBuilder */