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    <p>I'm not qualified to comment on logging for .Net, since my bread and butter is Java, but we've had a migration in our logging over the last 8 years you may find a useful analogy to your question.</p> <p>We started with a Singleton logger that was used by every thread within the JVM, and set the logging level for the entire process. This resulted in huge logs if we had to debug even a very specific part of the system, so lesson number one is to segment your logging.</p> <p>Our current incarnation of the logger allows multiple instances with one defined as the default. We can instantiate any number of child loggers that have different logging levels, but the most useful facet of this architecture is the ability to create loggers for individual packages and classes by simply changing the logging properties. Lesson number two is to create a flexible system that allows overriding its behavior without changing code.</p> <p>We are using the Apache commons-logging library wrapped around Log4J.</p> <p>Hope this helps!</p> <p><strong>* Edit *</strong></p> <p>After reading Jeffrey Hantin's post below, I realized that I should have noted what our internal logging wrapper has actually become. It's now essentially a factory and is strictly used to get a working logger using the correct properties file (which for legacy reasons hasn't been moved to the default position). Since you can specify the logging configuration file on command line now, I suspect it will become even leaner and if you're starting a new application, I'd definitely agree with his statement that you shouldn't even bother wrapping the logger.</p>
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    1. USSteve Moyer
    1. USSteve Moyer
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    1. COthanks for the answer. do you create the child loggers manually in code (i.e., are they hard coded) or through some kind of automatic/implicit thing?
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      1. USPaul Stovell
    2. CONo ... if we add a logging configuration to the logging.properties files for a package or class, they will be logged per that configuration but any package or class not specifically configured will be logged at the default levels.
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