![]() In the majority of the cases it will be a private, static object inside a class, for example: private static final Logger LOGGER = LogManager.getLogger(SomeFanc圜lassName.class) The Logger is the main entity that our application uses to create LogRecord, so basically to log what we want to output as the log message. It is less verbose and works, but is also less flexible if you want to use slightly more complicated functionalities. Public static void main(String args) %-5level - %msg%n rootLogger.level = info LOGGER = LogManager.getLogger(Log4JDefaultConfig.class) Let’s start with the code that we will be using for the test: package Keep in mind that the Log4j 1.x is deprecated and no longer maintained, so when choosing the logging library of your choice you should go for Log4j 2.x. ![]() For the purpose of this tutorial I created a simple Java project that uses Log4j 2, you can find it in our Github account. ![]() R ead our Logback tutorial if you’re curious to learn more about how this library works. Log4j 2 promises to improve the first version of the Log4j library and fix some of the issues identified in the Logback framework. Log4j 2 and its predecessor the Log4j are the most common and widely known logging framework for Java. What Is Log4j 2 and Why Should You Use It In our recent blog post about the Log4jShell vulnerability, we explained how you would know if you are affected by the problem, what steps to follow to fix it, and what we, at Sematext, have done to protect our system and users. The vulnerability was registered on the National Vulnerability Database as CVE-2021-44228 with a severity code of 10 and allows a system running Apache Log4j 2 version 2.14.1 or below to be compromised, giving an attacker full control to execute arbitrary code on the vulnerable server. On December 9, 2021, a critical vulnerability was disclosed and nicknamed Log4Shell. However, before diving into that, let’s address an issue that impacted the community using this framework. Today, we will look into Log4j 2, the latest version of the widely known Log4j library developed under the Apache Software Foundation. Logging in your Java applications can be achieved in multiple ways – for example, you can just write data to a file, but there are far better ways on how to do that, as we explained in our Java logging tutorial. Java logs combined with JVM metrics and traces give you full visibility into your Java applications. When it comes to troubleshooting application performance, the more information you have the better.
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