Log4jYahoo 是一个 Log4j 的扩展，用来将所有的异常信息发送到 Yahoo 的邮箱上。示例代码：

    import org.apache.log4j.Logger;        public class App {            private static Logger logger = Logger.getLogger(App.class);            public static void main(String[] args) throws InterruptedException {                logger.trace("trace message");                logger.warn("warn message");                // only error msgs will be emailed              logger.error("error message, a very long error message!");                Thread.sleep(2000);          }      }

项目主页：http://www.open-open.com/lib/view/home/1337267155916