Tested on Sonarqube community edition 7.5 with SonarJava 5.10.1.
The following code raises an issue, but should not raise an issue, because the “message” has no placeholders. Statement without the marker argument raises no issue as expected.
org.slf4j.Logger slf4jLog;
org.slf4j.Marker marker;
slf4jLog.debug(marker, "message");