How to log FATAL (or any custom log level) with SLF4J and Log4j2

Question

I have those specific requirements :

• Need to be able to log in FATAL level
• Need to use SLF4J<

Answer 1

The only solution I've found so far is to use have 5 markers :

final Marker traceMarker = MarkerFactory.getMarker("TRACE");
final Marker debugMarker = MarkerFactory.getMarker("DEBUG");
final Marker infoMarker = MarkerFactory.getMarker("INFO");
final Marker warnMarker = MarkerFactory.getMarker("WARN");
final Marker errorMarker = MarkerFactory.getMarker("ERROR");
final Marker fatalMarker = MarkerFactory.getMarker("FATAL");

And log passing the marker everytime :

logger.info(infoMarker, "!!! INFO World !!!");
logger.error(errorMarker, "!!! ERROR World !!!");
logger.error(fatalMarker, "!!! FATAL World !!!");

And modify the PatternLayout to totally remove the LogLevel and always log the Marker, such as :

PatternLayout:
  Pattern: "%d{ISO8601_BASIC} %marker [%t] %logger{3.} - %msg%n"

I kind of think this solution is a hack... It would also remove the log level of any external library using the LogLevel the right way.

Summary : This solution isn't a good solution.

UPDATE : I tried another solution, writing a RewritePolicy :

public class FatalRewritePolicy implements RewritePolicy {

    public static final String FATAL = "FATAL";

    @Override
    public LogEvent rewrite(final LogEvent logEvent) {

        final Marker marker = logEvent.getMarker();
        if (marker == null)
            return logEvent;

        // Log Level is final in the LogEvent, there's no way we can modify it.
        Level level = logEvent.getLevel();

        return null;
    }
}

There seems to be no way to change the LogLevel of a LogEvent in Log4j2 (which make sense).

Summary : Still no solution.