I am using Undertow 2.0.16 to build our microservices. I am using log4j 2.11 as my logging framework with undertow. I started using one of the handler StuckThreadDetectionHandler to verify what kind of message is generated. I purposefully added a sleep of more than the threshold in the handler however no message was printed. Moreover I've noticed if I use anything other than debug mode then Undertow doesn't log any messages in stdout or logfile.

I am using Log4j JCL adapter.

Moreover also setting this configuration during the startup of service:

		System.setProperty("org.jboss.logging.provider", "log4j2");

Also setting following configuration for undertow and xnio and nothing gets printed ever

		<AsyncLogger name="org.xnio" level="info" additivity="false" includeLocation="true">
			<appender-ref ref="async"/>
		</AsyncLogger>
		<AsyncLogger name="io.undertow" level="info" additivity="false" includeLocation="true">
			<appender-ref ref="async"/>
		</AsyncLogger>