Why isn't my zip file created and downloaded by Java?

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There could be many reasons why your zip file is not being created and downloaded by Java. Some possible reasons include:

1. Incorrect file path or file name specified in the code
2. Insufficient file permissions to create and write files in the specified directory
3. Incorrect coding syntax or logic
4. Network connectivity issues preventing the file from being downloaded
5. Incorrect file format or size limitations

To troubleshoot the issue, you should review your code, check file permissions, and confirm that your network connection is working correctly.