Logger Strategy

2.2.1 or later, dubbo support log4j、slf4j、jcl、jdk adapters ¹, you can also explicitly configure the log output policy in the following ways:

1. Command

   java -Ddubbo.application.logger=log4j
   

2. Configure in dubbo.properties

   dubbo.application.logger=log4j
   

3. Configure in dubbo.xml

   <dubbo:application logger="log4j" />