public ArrayList<Appender> findAllAppenders()
{
    ArrayList<Appender> appenderList = new ArrayList<>();

    Logger logger = org.apache.log4j.LogManager.getRootLogger();
    Enumeration appenders = logger.getAllAppenders();
    if (appenders != null) {
        while (appenders.hasMoreElements()) {
            Appender appender = (Appender) appenders.nextElement();
            if (appender != null) {
                appenderList.add(appender);
            }
        }
    }

    Enumeration loggers = org.apache.log4j.LogManager.getCurrentLoggers();
    while (loggers.hasMoreElements()) {
        logger = (Logger) loggers.nextElement();
        appenders = logger.getAllAppenders();
        if (appenders != null) {
            while (appenders.hasMoreElements()) {
                Appender appender = (Appender) appenders.nextElement();
                if (appender != null) {
                    appenderList.add(appender);
                }
            }
        }
    }
    return appenderList;
}

Find all the current log4j appenders by iterating through all loggers and checking the appender references.

Find all log4j appenders

Java