where to put log4j.properties in java gradle web application on eclipse

I am making a simple web application using Gradle. I am using slf4j and log4j as loggers, I added 3 jars using gradle.build file to work with slf4j. I went through the some gradle and slf4j tutorials and still I could not find and answer that where to put log4j.properties in gradle project. Can any body help me for that ?