NullPointerException in JMX Configurator getLoggerLevel:

on line 111, logger.getLevel() can be null.

in ch.qos.logback.classic.jmx.Configurator, lines 110 - 114, replace

if (logger != null) {
return logger.getLevel().toString();
} else {
return EMPTY;
}

with

if (logger != null && logger.getLevel() != null) {
return logger.getLevel().toString();
} else {
return EMPTY;
}