A repository demonstrating the issue: https://github.com/flaghacker/Log4jTest
I added a file called log4j2.yaml in the resources folder, so it should be on the classpath. Building an actual jar does confirm this.
When running this project (gradlew run) I get the following warning:
ERROR StatusLogger No log4j2 configuration file found. Using default configuration: logging only errors to the console. Set system property 'org.apache.logging.log4j.simplelog.StatusLogger.level' to TRACE to show Log4j2 internal initialization logging.
If I enable TRACE logging, one of the lines shows lo4j2 did indeed try looking for the file:
TRACE StatusLogger Trying to find [log4j2.yaml] using context class loader sun.misc.Launcher$AppClassLoader@18b4aac2.
Did I make a mistake somewhere? Or is this an actual bug?