001 : log4j 報錯

    匯入了commons-logging.jar和log4j-1.2.16.jar兩個jar包之後，就想試試log4j的強大功能了。沒想到一運行就報了錯

 

log4j:WARN No appenders could be found for logger (Log4jTest).
log4j:WARN Please initialize the log4j system properly.
log4j:WARN See http://logging.apache.org/log4j/1.2/faq.html#noconfig for more info.

 

稍微一看，才發現想要運行log4j的話，先要寫一個log4j.properties的配置文檔。不然就會報上面的錯誤。

附簡單的代碼：

import org.apache.log4j.Logger;</p><p>public class Log4jTest {</p><p>private static Logger logger = Logger.getLogger(Log4jTest.class);</p><p>public static void main(String[] args) {</p><p>logger.debug("Hello, my name is zwj.");<br />}</p><p>}