Скачать или смотреть How to Log Only to File and Not Console Using Log4J2

Learn how to configure Log4J2 to log messages exclusively to a file, avoiding console output entirely. Step-by-step guide with practical code examples.
---
This video is based on the question https://stackoverflow.com/q/66915050/ asked by the user 'MMMMS' ( https://stackoverflow.com/u/3766129/ ) and on the answer https://stackoverflow.com/a/66915565/ provided by the user 'rgoers' ( https://stackoverflow.com/u/1709216/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

Visit these links for original content and any more details, such as alternate solutions, latest updates/developments on topic, comments, revision history etc. For example, the original title of the Question was: Log4J2 - Write only to log file not console

Also, Content (except music) licensed under CC BY-SA https://meta.stackexchange.com/help/l...
The original Question post is licensed under the 'CC BY-SA 4.0' ( https://creativecommons.org/licenses/... ) license, and the original Answer post is licensed under the 'CC BY-SA 4.0' ( https://creativecommons.org/licenses/... ) license.

If anything seems off to you, please feel free to write me at vlogize [AT] gmail [DOT] com.
---
How to Log Only to File and Not Console Using Log4J2

Logging is an integral part of software development, as it allows developers to track the behavior and performance of their applications. In particular, using the Log4J2 framework in Java application provides an efficient way to handle logging functionalities. However, there might be scenarios when you wish to log information solely to a file while preventing any output to the console. If that's what you need, you're in the right place!

The Problem

You may have come across a situation where your Log4J2 configuration is set up, yet you find that the logging statements are neither appearing on the console nor in your log file. You want to specifically log messages at the INFO level to a file while completely keeping them off the console output.

The Solution

Here, I'll walk you through two different methods to configure your Log4J2 settings to accomplish this.

Method 1: Adjusting Appender References

The first approach is to modify the appender references in your Log4J2 configuration file. Here’s a breakdown of what you can do:

Update the Appender Levels - By adding specific levels to the appender references, you can control what gets logged and where.

Example Configuration:

[[See Video to Reveal this Text or Code Snippet]]

Method 2: Using Filters on Appenders

If you'd like more control over what gets logged to each appender, using filters is a great option. Here’s how you can achieve that:

Add Filters to the Appenders - Set the filtering criteria to accept or deny messages based on their severity level.

Example Configuration:

[[See Video to Reveal this Text or Code Snippet]]

Additional Considerations

When making these configurations, keep in mind:

Log4J performs checks to determine if logging is enabled. If misconfigured, you might end up creating unnecessary logging events that won’t be recorded.

Ensure your logging levels align with your needs, as mismatches can lead to no output or unwanted outputs in various appenders.

Conclusion

By following either of these methods, you can effectively configure Log4J2 to cater to your logging needs. Whether you prefer manipulating appender levels or utilizing filters allows you precise control over how your application logs messages. Now go ahead and refine your logging strategy to ensure you capture exactly what you need!