[I] spring boot configuration logging.config not working in 2.25.0 [logging-log4j2]

[via GitHub]

polarisGitHub opened a new issue, #3808:
URL: https://github.com/apache/logging-log4j2/issues/3808

   ## Description
   
   
   My project is deployed using docker, and `log4j.xml` is placed in the 
configuration center instead of locally. Use `logging.config=./conf/log4j2.xml` 
to specify the configuration file
   
   When using `2.24.3`, log4j2 works normally, but when using `2.25.0`, there 
is no log output.
   
   log write configuration is load, but log4j not work. 
   
   I tried to compare it with version 2.24.3 and found that there might be a 
problem
   
   2.25.0 lacks the `setConfiguration` call, which causes the loaded 
configuration to not take effect.
   ```java
   // 2.25.0
   public void start(final Configuration config) {
       LOGGER.info("Starting {}[name={}] with configuration {}...", 
getClass().getSimpleName(), getName(), config);
       if (configLock.tryLock()) {
           try {
               if (this.isInitialized() || this.isStopped()) {
                   setStarting();
                   reconfigure(config);
                   if (this.configuration.isShutdownHookEnabled()) {
                       setUpShutdownHook();
                   }
                   this.setStarted();
               }
           } finally {
               configLock.unlock();
           }
       }
       LOGGER.info("{}[name={}] started with configuration {}.", 
getClass().getSimpleName(), getName(), config);
   }
   
   // 2.24.3
   public void start(final Configuration config) {
       LOGGER.info("Starting {}[name={}] with configuration {}...", 
getClass().getSimpleName(), getName(), config);
       if (configLock.tryLock()) {
           try {
               if (this.isInitialized() || this.isStopped()) {
                   if (this.configuration.isShutdownHookEnabled()) {
                       setUpShutdownHook();
                   }
                   this.setStarted();
               }
           } finally {
               configLock.unlock();
           }
       }
       setConfiguration(config);
       LOGGER.info("{}[name={}] started with configuration {}.", 
getClass().getSimpleName(), getName(), config);
   }
   ```
   
   **Version:** 
   spring boot version: 2.7.18
   log4j2 version: 2.25.0
   
   **Operating system:** linux
   
   **JDK:** jdk17
   
   ## Logs
   
   ```
   2025-07-08T07:42:04.861760Z main DEBUG Loaded configuration from 
/Users/xxx/src/zzz/conf/log4j2.xml
   2025-07-08T07:42:06.402691Z main INFO Starting LoggerContext[name=76ed5528] 
with configuration 
XmlConfiguration[location=/Users/xxx/src/zzz/conf/log4j2.xml, 
lastModified=2025-07-08T07:42:02.425Z]...
   2025-07-08T07:42:06.403729Z main INFO LoggerContext[name=76ed5528] started 
with configuration 
XmlConfiguration[location=/Users/xxx/src/zzz/conf/log4j2.xml, 
lastModified=2025-07-08T07:42:02.425Z].
   .
   ```
   
   ## Reproduction


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