log4j tutorial


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Log4j is a simple and flexible logging framework. Logging equips the developer with detailed context for application failures. With log4j it is possible to enable logging at runtime without modifying the application binary.
This page lists down all tutorials on this website available on this topic. This page will be updated in time to time, as a new post is published. Feel free to suggest topics you want to read more on.
Log4j Configuration Examples
Maven configuration example
Learn the most basic steps to configure log4j logging support in your project using maven.
Properties configuration using PropertyConfigurator
Two most common configuration options are in practice industry wide i.e. using xml file configuration and using properties file configuration.
This this post, I am showing the example code for configuring log4j using properties file.
Xml configuration using DomConfigurator
In previous example, we learned about configuring log4j using properties file. This this tutorial, I am showing the example code for configuring log4j using xml configuration.
Log4j Layout examples
Create logs in html format : HTMLLayout example
Log4j comes with multiple options to format log files created by framework. It can create simple log files, html log files or xml log files also.
This this post, I am showing the example code for configuring log4j to produce logs in html format.
Create logs in xml format : XMLLayout example
Log4j comes with multiple options to format log files created by framework. It can create simple log files, html log files or xml log files also. This this post, I am showing the example code for configuring log4j to produce logs in xml format.
Log4j Appenders examples
Programmatically configure appenders example
Log4j allows logging requests to print to multiple destinations. In log4j speak, an output destination is called an appender. They vary from console, files, GUI components, remote socket servers to JMS. Let’s learn about programmatic way to configure appenders in log4j.
Store logs in database : JDBCAppender example
Log4j comes with multiple options to format log files created by framework. It can create simple log files, html log files or xml log files also. It also insert log statements into database also, using mysql statements. Let’s see the example code for configuring log4j to produce logs in database table.
Store logs in socket server : SocketAppender example
This this tutorial, I am showing the example code for configuring log4j to record logs events in a simple socket server (packaged inside log4j.jar itself) over the network location.
Log4j Logging levels
Logging levels in log4j
The amount and type of information shown in the system and event logs is controlled by the log4j “level” setting in configuration file. Remember, each message on the log is prefixed by the level of the message. Read more about them here.
Misc Examples
Reload logging levels in runtime
Excessive logging is a common cause of performance degrade of application. It is one of best practices to ensure proper logging within your Java EE application implementation. However, be careful with the logging level that you enable in your production environment. Excessive logging will trigger high IO on your server and increase CPU utilization.


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