How to resolve the issue of log4j2 not printing logs to…

In order to solve the issue of log4j2 not printing logs to a file, you can troubleshoot and resolve it by following these steps:

1. Check the configuration file of log4j2: make sure the settings in the configuration file are correct for outputting logs to a file. For example, check if a FileAppender is configured and if the correct log file path, file name, log format, etc. are specified.
2. Check the log file path and file permissions: Ensure the specified log file path exists and has write permissions. If the specified path does not exist, create it; if there are no write permissions, grant the necessary permissions.
3. Check the log4j2 log level configuration to ensure it is correct. If the log level is set to ERROR or FATAL but the program only outputs logs at DEBUG or INFO level, then the logs will not be written to the file.
4. Check the dependencies and configuration file location of log4j2: make sure that the correct version of log4j2 dependency is included in the project, and that the configuration file is placed in the correct location. Typically, the log4j2 configuration file should be placed in the root directory of the classpath.
5. Check for other factors that may affect the logging output: There could be other factors affecting the logging output, such as the use of different logging frameworks or configurations in the program. It is important to confirm if there are any conflicts or incorrect configurations.

If following the above steps does not resolve the issue, you can try using the debug mode provided by log4j2 to further investigate and solve the problem by checking the debug information. You can add the following configuration to the log4j2 configuration file.

<Configuration status="debug">
    ...
</Configuration>

This will provide more detailed debug information to help pinpoint the problem.