override handler level through logger.log

Question

Is there a way to Override the Handler's level through logger Object.

Eg:

FileHandler logFile = new FileHandler("DefaultLogger.log");
logger.setLevel(Level.FINE);

should set the fileHandler's level to fine as well.

Answer 1

You can use the Logger::getHandlers method to acquire all of the install handlers for the given logger. For example:

private static void setHandlersLevel(Logger logger, Level lvl) {
    for (Handler h : logger.getHandlers()) {
       h.setLevel(lvl);
    }
}

Otherwise if you want to find all handler on all loggers you can use the following:

private static void setAllHandlersLevel(Level lvl) {
    LogManager lm = LogManager.getLogManager();
    synchronized (lm) {
        Enumeration<String> e = lm.getLoggerNames();
        while (e.hasMoreElements()) {
            Logger l = lm.getLogger(e.nextElement());
            if (l != null) {
                for (Handler h : l.getHandlers()) {
                    h.setLevel(lvl);
                }
            }
        }
    }
}