Log4j is an open-source project of Apache, which allows you to set the log output destination to console, file, GUI  component, socket server, NT event recorder, or UNIX Syslog daemon. You can  also set the output format and level of each log to control log generation with a finer granularity.  These configurations can be performed flexibly by using a configuration file without modifying application codes.

Alibaba Cloud Log4j Appender allows you to set the log output destination to Alibaba Cloud Log Service.  For more information about download link and user guide, refer to Github.