001 : log4j 报错
导入了commons-logging.jar和log4j-1.2.16.jar两个jar包之后，就想试试log4j的强大功能了。没想到一运行就报了错: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，才发现想要运行log4j的话，先要写一个log4j.properties的配置文档。不然就会报上面的错误。
附报错代码：
import org.apache.log4j.Logger;public class Log4jTest {private static Logger logger = Logger.getLogger(Log4jTest.class);public static void main(String[] args) {logger.debug("Hello, my name is zwj.");}}
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