I am using eclipse as my ide. I want to add log4j to the build path. Therefore I downloaded the zip file from the log4j site. In fact I have my libary as referenced lib, but the logger isn`t recognized by the ide… 
I appreaciate your answer!!!
PS.: The import i use is:
import org.apache.log4j.Logger;
Right click project -> BuidPath -> Configure Build Path
Select library tab
Use add jars or add external jars to include the jar in your project class path.
Hope it helps …