[GitHub] [logging-log4j2] ppkarwasz commented on issue #1267: Springboot - not replace spring propreties in log4j.xml

["ppkarwasz (via GitHub)" <gi...@apache.org>]

ppkarwasz commented on issue #1267:
URL: https://github.com/apache/logging-log4j2/issues/1267#issuecomment-1419412636

   @schotten,
   
   Logging in a Spring Boot application is configured at least twice:
   
    * when the `SpringApplication` class is loaded (that is what you see in your stacktrace). This process is described in [automatic configuration](https://logging.apache.org/log4j/2.x/manual/configuration.html#AutomaticConfiguration) and does **not** have access to Spring's environment (that didn't start yet),
    * after the `ApplicationEnvironmentPreparedEvent` is fired (cf. [lifecycle of a Spring Boot application](https://docs.spring.io/spring-boot/docs/current/reference/html/features.html#features.spring-application.application-events-and-listeners)). This process is specific to Spring Boot, **has** access to Spring's environment and uses the `log4j2-spring.xml` file (falling back on `log4j2.xml` if such a file does not exist).
   
   If you want to use Spring's enviroment to configure your logging system you have to options:
   
   1. Create two files: `log4j2.xml` and `log4j2-spring.xml`. The first one will be used during the bootstrap phase of your application and can not use Spring's environment. The second one will be used, when your application is up and running.
   2. Stick to a single configuration file and use [arbiters](https://logging.apache.org/log4j/2.x/manual/configuration.html#Arbiters) to provide multiple versions of your "solver-service" appender:
   ```lang-xml
   <Select>
       <SpringProfile name="dev">
           <File name="solver-service" fileName="${spring:log4j.solver.service.path}" append="false">
               <EcsLayout serviceName="${spring:log4j.solver.service.name}" serviceVersion="${spring:log4j.solver.service.version}"  serviceEnvironment="${spring:log4j.solver.service.enviroment}"/>
           </File>
       </SpringProfile>
       <DefaultArbiter>
           <Null name="solver-service"/>
       </DefaultArbiter>
   </Select>


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