Consider upgrade to log4j2 about jcabi-log

[longtimeago]

@yegor256 could you please consider resolution of the issue?

[yegor256]

@longtimeago but we don't work with log4j anyhow in this library. We only communicate with slf4j. Or I missed something?

[longtimeago]

@yegor256 Yes, log4j is optional but we use it for MulticolorLayout.
PatternLayout from log4j2 supports coloring.
So we could upgrade to log4j2, get rid of MulticolorLayout and have all other nice features from log4j2

[yegor256]

@longtimeago yeah, right, but we don't need any other features from log4j :) MulticolorLayout is the only place where we use log4j. Maybe it's time to just delete it, since log4j2 supports colors out of the box?

[longtimeago]

@yegor256 Yes, this is good option :)
In this case clients which still want coloring would have to use migrate on log4j2.
Beware, it's not a straightforward process. One thing I know is that log4j2 does not support configuration in property files, xml only

[longtimeago]

@yegor256 can we proceed here?

[yegor256]

@longtimeago I gave it another thought... what is the point of removing it? we have users, the class is rather convenient. what exactly is the goal?

[longtimeago]

@yegor256 I thought again ... looks like you are right. There is no reason in removing MulticolorLayout as well as well as removing optional dependency on log4j.