How to resolve the issue of log4j not logging to file?

There could be several reasons why log4j is unable to output logs to a file:

1. Configuration file error: Please ensure that the log4j configuration file is correct and successfully loaded. You can check if the path and file name of the configuration file are correct, and confirm if the file is located in the classpath.
2. Permission issue: Make sure the directory where the log files are located has write permission so that log4j can create and write to the log files. If there is no permission, you can try changing the directory’s permissions or placing the log files in another directory with write permission.
3. Log level setting: Please check the configuration file of log4j to ensure that the log level is set to a level that can be output. If the log level is set to ERROR, and the log output in the application is at the DEBUG level, the log will not be output to the file.
4. Configuration issues with Appender: Please ensure that the log4j configuration file has correctly configured the file output Appender. You can verify if the Appender name, file name, and file path are set up correctly.

If none of the solutions above work, you can try using a different logging framework or checking log4j’s log output to the console for further troubleshooting.