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[[data logging|Logging]] is a common issue for most development teams. There have been several frameworks developed to ease and standardize the process of logging for the [[Java platform|Java platform]]. This page covers general purpose logging frameworks. There are other logging frameworks, toolkits and libraries like [http://aopclsuite.sourceforge.net/tracing.html Tracing Class Loader] but that is for another topic.
==Functionality Overview==
Logging a message is broken into three major pieces:the Logger, Formatter and the Appender (Handler). The Logger is responsible for capturing the message to be logger, along with certain meta-data like level, and passing that to the logging framework. After receiving the message, the logging framework calls the Formatter on the message. The Formatter accepts and object and formats it for proper logging. The logging framework then hands the formatted message to the appropriate Appender to dispostion of the message. This might include displaying on a console, writing to disk, appending to a database, or notification via email.
===Logger===
Most frameworks support a the notion of a Logger. A Logger is an object that allows the application to log data without regard to where the data is actually logged. The application logs a message in the form of an object or and object and and exception. When a Logger is created, it is given a name or an identifier. When logging a message, it is logged at a certain level or priority.
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The logging framework maintains the current logging level for each logger. The logging level can be set more or less restrictive. For example, if the logging level is set to "WARNING", then all messages of that level or higher are logged, ERROR and FATAL.
===Formatters or Layouts===
A Formatter is an object that formats a given object for logging by the Appender.
===Appenders or Handlers===
The appenders are configured to listen for messages of a certain log level or above.
==Best Practices==
==Summary==
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