What is Log4J2?

The newer and much-anticipated version keeps all the same logging features as Log4J and massively builds upon it with significant improvements to its overall performance and features.

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Logging is important for any software or mobile application and has uses for debugging and audits, amongst other things, so choosing the very best logging library is important.

#1: Migrating to LOG4J2
Migrating has left quite a few people stumped and it can be pretty difficult to get the Maven dependencies correct. The first thing you will need is the log4j-core.jar file (this depends on log4j-api) and, in addition, you will need log4j-web if you are using it in a web application. In-order to get Velocity to work with Log4J2 you will also need to add log4j-1.2-api.

Basically, when migrating, you will probably need to use much older Log4J dependencies, however, if you are using Maven, execute the command ‘mvn dependency:tree | grep log’ to display these dependencies.

#2: Why Is This Important?
Most Java developers will probably be aware of this; however, log files are important in any programming environment. Choosing a robust logging solution can mean the difference between spending five minutes or days trying to understand where a problem is coming from and fixing it.

Log4J2 is a super powerful and comprehensive logging solution which comes with a wide range of features and configuration options. With Log4J2, you can easily configure it to undertake advanced logging practices – e.g. rolling files – and it supports structured formats such as XLM and JSON.

If you are trying to create any application without having a robust logging solution in place, you risk spending lots of your valuable time tracing back through your code, desperately trying to find out where you have gone wrong. More often than not, an out of place semi-colon or variable can cost you hours of time.

#3: Do I Need to Upgrade
No, you don’t need to upgrade, however, Log4J2 was a widely-anticipated update and any serious Java developer would have instantly jumped on it. Your Java applications and such will still work just fine with Log4J, but you cannot benefit from the updated functionality, new logging features, or improved performance on the older version.

As with anything programming-related, it really does pay off to always be using the most up-to-date libraries, as they will enable you to get the best possible performance out of any application you make. Upgrading to Log4J2 varies in difficulty – depending on how complex your applications are and how many dependencies they have – and it may take some time, but it is more than worth it.

We’re not pretending Log4J2 is a simple upgrade which you can just get going with; it takes some time to migrate and get everything sorted out. Log4J2 Tutorial is the recent update to the much-loved Log4J library used within the Java programming language’s ecosystem that has been used for several years. If you want to learn more about Log4J2 and get migrated, check out this Log4J2 tutorial.

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