about Log4j：日志信息居然打印两遍

Question

配置文件={
log4j.rootLogger=info,A
log4j.logger.DBLog=debug,A
##############
#Log for A #
##############
log4j.appender.A=org.apache.log4j.ConsoleAppender
log4j.appender.A.Target=System.out
log4j.appender.A.layout=org.apache.log4j.PatternLayout
log4j.appender.A.layout.ConversionPattern=%-d{yyyy-MM-dd HH:mm}|%m|(%C:%L)%n
};
java代码={
public class Log {
public static Logger getDBLogger(){
return dblog = Logger.getLogger("DBLog");
}
}
//调用部分
Log.getDBLogger().debug("mess");
};
mess信息居然在eclipse控制台出来两遍，这是为什么呢？我改如何修改

Answer 1

public static Logger getDBLogger(){
return dblog = Logger.getLogger("DBLog");
}

--->
public static Logger getDBLogger(){
return dblog = Logger.getLogger(Log.class);
}