这样使用LOG4J有什么缺陷？

Question

public class LogUtil {


    private static Log LOG;


        public static void trace(Object o) {


        LOG = LogFactory.getLog(Reflection.getCallerClass(2));


        LOG.trace(o);


    }


    public static void trace(String msg, Throwable error) {


        LOG = LogFactory.getLog(Reflection.getCallerClass(2));


        LOG.trace(msg, error);


    }   

public static void debug(Object o) {   
    LOG = LogFactory.getLog(Reflection.getCallerClass(2));   
    LOG.debug(o);   
}   
public static void debug(String msg, Throwable error) {   
    LOG = LogFactory.getLog(Reflection.getCallerClass(2));   
    LOG.debug(msg, error);   
}   

public static void info(Object o) {   
    LOG = LogFactory.getLog(Reflection.getCallerClass(2));   
    LOG.info(o);   
}   
public static void info(String msg, Throwable error) {   
    LOG = LogFactory.getLog(Reflection.getCallerClass(2));   
    LOG.info(msg, error);   
}   

public static void warn(Object o) {   
    LOG = LogFactory.getLog(Reflection.getCallerClass(2));   
    LOG.warn(o);   
}   

public static void warn(String msg, Throwable error) {   
    LOG = LogFactory.getLog(Reflection.getCallerClass(2));   
    LOG.warn(msg, error);   
}   

public static void error(Object o) {   

    LOG = LogFactory.getLog(Reflection.getCallerClass(2));   
    LOG.error(o);   
}   
public static void error(String msg, Throwable error) {   
    LOG = LogFactory.getLog(Reflection.getCallerClass(2));   
    LOG.error(msg, error);   
}   

public static void fatal(Object o) {   
    LOG = LogFactory.getLog(Reflection.getCallerClass(2));   
    LOG.fatal(o);   
}   
public static void fatal(String msg, Throwable error) {   
    LOG = LogFactory.getLog(Reflection.getCallerClass(2));   
    LOG.fatal(msg, error);   
}   
}  

在具体的类中直接:
LogUtil.debug("");等等就OK了!
要是不想使用Log4j，Logger，直接修改LogUtil.java就可以了

但是我看别人一般是:
private static Logger log = Logger.getLogger(xxxx.class.getName());
log.debug();

这样写觉得比较麻烦!为什么每个类都要"private static Logger log = Logger.getLogger(xxxx.class.getName());"
??
要是不想使用Log4j，Logger，得修改每个类，去掉"private static Logger log = Logger.getLogger(xxxx.class.getName());" 太麻烦了！


我的那种使用方法有什么缺陷吗?

Answer 1

LogFactory.getLog(Reflection.getCallerClass(2));
你看看这端代码究竟会做什么
1、反射
2、LogFactory.getLog，是不是会做一些初始化等

我想性能是主要考虑吧

另外：
把log4j换掉的几率几乎为0吧

private static Log LOG;

public static void trace(Object o) {

LOG = LogFactory.getLog(Reflection.getCallerClass(2));

LOG.trace(o);

}
这种使用，并发下，会出问题吧