multiple instances of Logger after startup

[Oleg]

I use Tomcat 5.0.28 server, right after startup JProfiler reports about
75 instances of org.apache.log4j.Logger running. All my servlets get
logger like so:

private static Logger log = Logger.getLogger(ClassName.class);

I was under impressions that there will be a single insance of Logger for 
all classes, why there so many instances?

Thanks
Oleg