After migrating to Java 11 we were suddenly seeing a lot of caught exceptions in sun.rmi.runtime.Log#getSource(), see https://bugs.openjdk.java.net/browse/JDK-8230058.
Apparently somewhere in Java 9 a distinction between system loggers and user loggers was introduced. See java.util.logging.Logger.SystemLoggerHelper
The WildFly logging subsystem / JBoss LogManager seems to only configure user loggers but not not system loggers. This has the effect that the "sun.rmi" loggers run with level INFO rather than WARN and exceptions in Log#getSource() are thrown.
How to reproduce the issue: