ContextListener do Logback e acesso a propriedades

CustomContextListener.java

import ch.qos.logback.classic.Level;
import ch.qos.logback.classic.Logger;
import ch.qos.logback.classic.LoggerContext;
import ch.qos.logback.classic.spi.LoggerContextListener;
import ch.qos.logback.core.Context;
import ch.qos.logback.core.spi.ContextAwareBase;
import ch.qos.logback.core.spi.LifeCycle;

public class CustomContextListener extends ContextAwareBase implements LoggerContextListener, LifeCycle {

    private static final String PROPERTY = "property.name";

    private boolean started = false;

    @Override
    public void start() {
        if (started) {
            return;
        }

        Context context = getContext();
        String property = context.getProperty(PROPERTY);

        addInfo("Property value=" + property);
        started = true;
    }

    @Override
    public void stop() {
    }

    @Override
    public boolean isStarted() {
        return started;
    }

    @Override
    public boolean isResetResistant() {
        return false;
    }

    @Override
    public void onStart(LoggerContext context) {

    }

    @Override
    public void onReset(LoggerContext context) {

    }

    @Override
    public void onStop(LoggerContext context) {

    }

    @Override
    public void onLevelChange(Logger logger, Level level) {

    }
}

logback.xml

    <property resource="app.properties"/>
    <property scope="context" name="property.name"  value="${app.property.name}"/>