The currently used log4j-over-slf4j version 1.7.5 has a bug (see http://bugzilla.slf4j.org/show_bug.cgi?id=279 )
I am currently porting a maven plugin for JiBX (see http://jibx.org ) to gradle and this bug is blocking me because JiBX code uses the missing method. The only workaround I have is replacing slf4j jars in my gradle folder with newer versions. I have tried slf4j 1.7.6 and 1.7.7 - both of them have this bug fixed.
Thanks in advance, Alexander