问题描述:在eclipse下运行hadoop项目,没有输出日志,警告如下,意为没有找到log4j文件. log4j:WARN No appenders could be found for logger (org.apache.hadoop.util.Shell). log4j:WARN Please initialize the log4j system properly. log4j:WARN See http://logging.apache.org/log4j/1.2/faq.html#