Monday, January 22, 2018
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Java GNU Packs - Log4j API

Log4j is an Open Source logging API developed under the Jakarta Apache project. It provides a robust, reliable, fully configurable, easily extendible, and easy to implement framework for logging Java applications for debugging and monitoring purposes. Log4j allows developers to insert log statements in their code and configure them externally. Logging, or writing the state of a program at various stages of its execution to some repository such as a log file, is an age-old method used for debugging and monitoring applications. By inserting simple yet explanatory output statements in the application code that write to a simple text file, console, or any other repository, a reliable monitoring and debugging solution can be achieved.

Although low-level, this is the mechanism to fall back upon when sophisticated debugging tools are either unavailable for any reason or useless; such as in a distributed application scenario. Inserting log statements manually is tedious and time-consuming, not to mention managing them down the road due to various reasons such as ongoing upgrading and bug-fixing process for application code, and so forth. This is where log4j API has arrived to ease the process. Log4j handles inserting log statements in application code and managing them externally without touching application code, by using external configuration files.

Log4j categorizes log statements according to user-specified criteria and assigns different priority levels to these log statements. These priority levels decide which log statements are important enough to be logged to the log repository. Log4j lets users choose from several destinations for log statements, such as console, file, database, SMTP servers, GUI components etc.; with option of assigning different destinations to different categories of log statements. These log destinations can be changed anytime by simply changing log4j configuration files. Log4j also facilitates creation of customized formats for log output and provides default formats in which log statements will be written to log destination.

There are 2 ways to configure log4j. One is with a properties file and the other is with an XML file. Loggers are logical log file names. They are the names that are known to the Java application. Each logger is independently configurable as to what level of logging (FATAL, ERROR, etc) it currently logs. In early versions of log4j, these were called category and priority, but now they're called logger and level, respectively. The actual outputs are done by Appenders. There are numerous Appenders available, with descriptive names, such as FileAppender, ConsoleAppender, SocketAppender, SyslogAppender, NTEventLogAppender and even SMTPAppender. The size of log files also can be controlled and managed using Log4j.

What Java Development India Offer?

Java Development India offers Log4j API development, Log4j API consulting and Log4j API related solutions from our offshore software development outsourcing centre at Kochi, Kerala in India.


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