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This article will explain in detail how to convert log4j to logback in Java. The content of the article is of high quality, so the editor will share it with you for reference. I hope you will have some understanding of the relevant knowledge after reading this article.

When it comes to journaling in Java applications, log4j was and may still be the de facto standard.

The scheme of writing logs in JDK provided by Sun has not been fully popularized. The reason for this, of course, is its lack of configurability and flexibility. JDK's logging solution is certainly a solution for relatively simple projects, but not for enterprise applications.

Now, in addition to log4j, there is a new implementation that is more powerful, faster, and more flexible than log4j: logback. Well, logback actually started in 2006, but version 1.0 was not released until November 2011.

Logback was developed to replace log4j, and both it and log4j are from the same developer. Version 1.0 is now available after years of testing and development (version 1.0.1). In order to avoid misunderstanding because its version number is so small, it should be pointed out that logback has been used in the industry for many years, and in short, its version number is by no means a statement of its stability and functionality.

Compared with log4j, logback has many advantages. Some of the following are listed:

Faster implementation

Automatically reload log configuration files

Better filter (filter)

Automatically compress archived log files

Information about Java packages (jar files) is included in the stack trace

Automatically delete old log archive files

It is very easy for developers to switch from log4j to logback. As long as you convert a dependency in your Maven POM, you are ready:

Ch.qos.logback logback-classic 1.0.0

Due to transitive dependency, log facace,slf4j has also been added to your project.

Use slf4j as an example of "Hello World", like this:

Package demo; import org.slf4j.Logger; import org.slf4j.LoggerFactory; public class HelloWorld {public static void main (String [] args) {Logger log = LoggerFactory.getLogger (HelloWorld.class); log.info ("HelloWorld");}}

All that's left is to write a configuration file that controls the log output.

Configuration files are often called log4j.xml in log4j, logback.xml in logback, or logback-test.xml in a test environment.

In Maven project, the logback.xml file must be placed in the $PROJECT_HOME/src/main/resources directory. The logback-test.xml file must be placed in the $PROJECT_HOME/src/test/resources directory. A simple configuration file can be written like this:

% d {HH:mm:ss.SSS} [% thread]%-5level% logger {36} -% msg%n

The complete manual of logback is very detailed and can be read here.

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