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Answer 1

+1 A:

I will assume you are using java.util.logging package. In that case, whenever and wherever you use Logger.getLogger(someString) you will get the same Logger instance.

For example: if in Main class you use Logger log = Logger.getLogger("myLogger"); , you can get the same logger in any other class by using Logger.getLogger("myLogger");

cbaby 2010-10-12 14:54:45

So I don't need to pass the logger and set the logger instance?e.g.private void setLogger(Logger logger) {this.logger = logger;}

Omertron 2010-10-12 16:47:53

Ok, so I've done that, changed the method to accept the string name of the logger. Now I need to redirect the main class's logFormatter to my local class's formatter, but that now "overwrites" the main class's formatter

Omertron 2010-10-12 21:17:15

Well, you could "save" the original (Main) logger formatter, for instance as a sub-class field, and set it back when you're done using it in sub-class. I would say its safe enough if there is no parallelism. However, the recommended practice is that all classes should use there own logger and get their own instances by using Logger.getLogger(LocalClass.class.getName()).

cbaby 2010-10-13 10:35:41

Ok, I understand that, but how would I then use another class's filehandler to write to that (physical) log file?

Omertron 2010-10-14 08:45:20

Both of your loggers would "inherit" handlers from the root logger. So all you need to do is add file handler to your root logger. This would also mean that all your future loggers will use that same file handler (unless you use setUserParentHandlers(false) on them).

cbaby 2010-10-14 15:57:29

Answer 2

A:

This is what I have so far:

public void setLogger(String loggerName) {
    MySubClass.logger = Logger.getLogger(loggerName);

    for (Handler handler : logger.getHandlers()) {
        handler.setFormatter(tmdbFormatter);
    }
    logger.setUseParentHandlers(true);
    logger.setLevel(Level.ALL);
}

Omertron 2010-10-12 21:19:18

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Passing a logger between classes

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