Similar log messages when user adds additional image to series

[php-coder]

Currently when user adds additional image to series we log the following:

ImageServiceImpl: Series #1: image #2 was added
SeriesServiceImpl: Image #2 was added to series #1 by user #2

The 2nd looks duplicated but we can't remove it because inside ImageServiceImpl.addToSeries() we don't have access to user id.

I suggest to use MDC that will hold user id. If it will work then the 2nd log could be safely removed.

Related articles:

• http://www.baeldung.com/mdc-in-log4j-2-logback
• http://logback.qos.ch/manual/mdc.html
• http://docs.spring.io/spring-boot/docs/1.5.x/reference/html/boot-features-logging.html