Use of readConfiguration method in logging activities

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As far as I have seen, the readConfiguration methods have only one flaw, which I found by debugging through the JDK Code because I also missed log messages. They do not load per-logger handlers. If you do not use per-logger handlers, the readConfiguration method should work just fine. The readConfiguration first resets all loggers, removing the handlers amongst other things and then forgets to check for per-logger handlers.
Because of that you miss your log messages. You originally had three handlers, the root handler, the handler on your package and the handler on your class. Then you switched off useParentHandlers on your class and called readConfiguration. Now – as useParentHandlers is not reset, probably it should – and your per-logger handlers are not setup anymore, severe3 is only logged once through the root handler and severe4 is not logged at all as useParentHandlers is false and so no fallback to the root handler is done.

The “many more mistakes” described by Dieter are btw. exactly the same issue.

You can also easily work-around the bug if you prefer using a logging configuration file. Just iterate over the already existing loggers after you called readConfiguration and call LogManager.loadLoggerHandlers for each of them. In Groovy this would be

def logManager = LogManager.logManager
logManager.loggerNames.each {
    logManager.loadLoggerHandlers logManager.getLogger(it), it, "${it}.handlers"
}

I tested this and it works.
For Java you have to use reflection as it is a private method. Should be something like

LogManager logManager = LogManager.getLogManager();
Method loadLoggerHandlers = LogManager.class.getDeclaredMethod("loadLoggerHandlers", Logger.class, String.class, String.class);
loadLoggerHandlers.setAccessible(true);
for (String loggerName : logManager.getLoggerNames()) {
    loadLoggerHandlers.invoke(logManager, logManager.getLogger(loggerName), loggerName, loggerName + ".handlers");
}

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