Log4j: Difference between revisions
| Line 1: | Line 1: | ||
=Concepts= | =Concepts= | ||
Log4j has | Log4j has teh following fundamental objects: | ||
* logger | |||
* categories, | |||
* [#Priority|priorities (levels)], | |||
* appenders and | |||
* layouts. | |||
==Logger | |||
==Category== | ==Category== | ||
Revision as of 21:47, 26 January 2012
Concepts
Log4j has teh following fundamental objects:
- logger
- categories,
- [#Priority|priorities (levels)],
- appenders and
- layouts.
==Logger
Category
A category is a like java named entity. There exists a special root category that simply is, but has no name.
Priority
Priority objects have both a string name and an integer value. The name is simply a mnemonic label for the priority. The integer value defines a relative order amongst priorities. The Level class extends the Priority class to be conform with java.util.logging.
Configuration
Properties can be defined by a properties file or by an XML file. The xml configuration class offers more flexibility and the benefits, and drawbacks, of an XML based configuration.
Logging Level are:
- ALL
- DEBUG
- ERROR
- FATAL
- INFO
- OFF
- TRACE
- WARN