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What should we use in jboss-log4j.xml in order to turn on/off traces for our product - "category" or "logger" tag?
By default JBoss uses "category" in jboss-log4j.xml.
But as far as I know "category" is deprecated and "logger" should be used instead.
Why JBoss uses deprecated "category" tag in a new product?
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The "Category" groups sets of logger components. This way the level of all the logger components for a particular category can be controlled with a single log4j XML configuration[Have a set of logger statements grouped into a category. Each category can have a log level.]
In log4j a logger is associated with a package or sometimes with a particular class. Package/class of a logger is defined by the attribute "name". A logger logs messages in its package and also in all the child packages and their classes.
Logger is a subclass of Category, i.e. it extends Category. In other words, a logger is a category. Thus, all operations that can be performed on a category can be performed on a logger. Internally, whenever log4j is asked to produce a Category object, it will instead produce a Logger object.
JBoss AS uses log4j as logging framework. This tutorial will show how to configure log4j service in your jBoss application server and also how to create a custom configuration which can be deployed along with your application. Log4j is a flexible open source project from Apache.
Habit, I suspect. I still to use category also. It behaves exactly the same as logger, there really is no difference.
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category in the log4j.xml (not limited to jboss-log4j.xml) is common practice and its not deprecated. What got deprecated is the Category Class as in usage of Category in code like,
Category category = Category.getInstance('something');
In log4j.xml, both category and logger can be used. Probably the newer code will have the logger in log4j.xml. Old way is category.
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