someJavaClass.java

public class someJavaClass {
private static Log log = LogFactory.getLog(someJavaClass.class);

}

In the log4j.properties define the log properties you want to display such as

log4j.rootLogger = DEBUG
log4j.appender.site = org.apache.log4j.FileAppender
log4j.appender.site.file = C:yourLogFile.log
log4j.appender.site.layout = org.apache.log4j.PatternLayout
log4j.appender.site.layout.conversionPattern = %d [%t] %-5p %c – %m%n
log4j.appender.site.append = false