archaius-core/src/main/java/com/netflix/config/ConcurrentMapConfiguration.java
@Override
    protected void fireError(int type, String propName, Object propValue, Throwable ex)
    {
        if (errorListeners == null || errorListeners.size() == 0) {
            return;
        }

        ConfigurationErrorEvent event = createErrorEvent(type, propName, propValue, ex);
        for (ConfigurationErrorListener l: errorListeners) {
            try {
                l.configurationError(event);
            } catch (Throwable e) {
                logger.error("Error firing configuration error event", e);
            }
        }
     }
@Override
    protected void fireError(int type, String propName, Object propValue, Throwable ex)
    {
        if (errorListeners == null || errorListeners.size() == 0) {
            return;
        }

        ConfigurationErrorEvent event = createErrorEvent(type, propName, propValue, ex);
        for (ConfigurationErrorListener l: errorListeners) {
            try {
                l.configurationError(event);
            } catch (Throwable e) {
                logger.error("Error firing configuration error event", e);
            }
        }
     }
Creates an error event and calls {@link ConfigurationErrorListener#configurationError(ConfigurationErrorEvent)}
for all listeners while catching Throwable.