[GitHub] zhangzhxb520 commented on issue #1713: Support log4j2

[GitBox]

zhangzhxb520 commented on issue #1713: Support log4j2
URL: 
https://github.com/apache/incubator-dubbo/issues/1713#issuecomment-389692957
 
 
   I found code in *LoggerFactory*，Why use log4j as default logger when system 
property "dubbo.application.logger" not set.
   
   ```java
   static {
           String logger = System.getProperty("dubbo.application.logger");
           if ("slf4j".equals(logger)) {
               setLoggerAdapter(new Slf4jLoggerAdapter());
           } else if ("jcl".equals(logger)) {
               setLoggerAdapter(new JclLoggerAdapter());
           } else if ("log4j".equals(logger)) {
               setLoggerAdapter(new Log4jLoggerAdapter());
           } else if ("jdk".equals(logger)) {
               setLoggerAdapter(new JdkLoggerAdapter());
           } else {
               try {
                   setLoggerAdapter(new Log4jLoggerAdapter());
               } catch (Throwable e1) {
                   try {
                       setLoggerAdapter(new Slf4jLoggerAdapter());
                   } catch (Throwable e2) {
                       try {
                           setLoggerAdapter(new JclLoggerAdapter());
                       } catch (Throwable e3) {
                           setLoggerAdapter(new JdkLoggerAdapter());
                       }
                   }
               }
           }
       }
   ```

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