我不知道如何配置我的log4j，使我的debugLog和reportsLog彼此分离（不是相加的）。为什么在下面的配置中，reportsLog总是空的？

log4j.rootLogger=TRACE, stdout, debugLog

log4j.appender.stdout=org.apache.log4j.ConsoleAppender
log4j.appender.stdout.layout=org.apache.log4j.PatternLayout
log4j.appender.stdout.layout.ConversionPattern=%d [%24F:%t:%L] - %m%n

log4j.appender.debugLog=org.apache.log4j.FileAppender
log4j.appender.debugLog.File=logs/debug.log
log4j.appender.debugLog.layout=org.apache.log4j.PatternLayout
log4j.appender.debugLog.layout.ConversionPattern=%d [%24F:%t:%L] - %m%n

log4j.reportsLog=DEBUG,reportsLog
log4j.appender.reportsLog=org.apache.log4j.FileAppender
log4j.appender.reportsLog.File=logs/reports.log
log4j.appender.reportsLog.layout=org.apache.log4j.PatternLayout
log4j.appender.reportsLog.layout.ConversionPattern=%d [%24F:%t:%L] - %m%n

下面是我的Java代码：

package test;

import org.apache.log4j.Logger;
import org.apache.log4j.PropertyConfigurator;

public class HelloLogger {

    static final Logger debugLog = Logger.getLogger("debugLog");
    static final Logger resultLog = Logger.getLogger("reportsLog");

    public static void main(String[] args) {
        PropertyConfigurator.configure("log4j.properties");
        debugLog.debug("Hello debugLog message");   
        resultLog.debug("Hello reportsLog message");
    }   
}