in spring/src/main/java/org/apache/logging/log4j/boot/spring/PrebootConfigurationFactory.java [44:51]
public Configuration getConfiguration(LoggerContext loggerContext, ConfigurationSource source) {
if (source != null && source != ConfigurationSource.NULL_SOURCE) {
if (LoggingSystem.get(loggerContext.getClass().getClassLoader()) != null) {
return new DefaultConfiguration();
}
}
return null;
}