old driver 5178b2c7a5
make Slf4JLoggerFactory be singleton (#11253)
Motivation:

The current initialization of Slf4JLoggerFactory is not singleton.

Modification:

Use Slf4JLoggerFactory.INSTANCE to initialize Slf4JLoggerFactory.

Result:

The instance of Slf4JLoggerFactory became a singleton.
2021-05-17 09:10:15 +02:00
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