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Date: Fri, 18 Feb 2011 15:01:42 +0100
From: Martin Nyolt <a31bd12e@freenet.de>
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To: log4j-user@logging.apache.org
Subject: Log4j closes System.err
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Hello,

I use the following code to load a default configuration in case no configuration was set using the log4j.configuration property:

static {
	LOGGER = Logger.getLogger(MyClass.class);
	Logger root = Logger.getRootLogger();
	boolean inited = root.getAllAppenders().hasMoreElements();

	if (!inited) {
		Layout layout = new PatternLayout("%-5p [%t]: %m%n");
		// create Appender to System.err
		ConsoleAppender app = new ConsoleAppender(layout, ConsoleAppender.SYSTEM_ERR);
		// set the follow option
		app.setFollow(true);
		app.activateOptions();
		root.addAppender(app);
		root.setLevel(Level.ERROR);
	}
}

If I don't call "app.activateOptions()", the follow-option wouldn't take effect (and I do need "follow" to be true).
But activateOptions finally calls WriterAppender.reset, which calls ConsoleAppender.close and closes the previous output stream, in this case System.err - but closing System.err is not a good idea, as it is still needed - I just want to change the Follow-Option.

Is this a misbehaviour of log4j, or am I incorrectly using the API?

Best regards
Martin Nyolt

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