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I'm a Java developer writing a web app (Jetty server).

Are there any guides out there are how I might downgrade user permissions using Java?

Most native Linux apps will start as root, open root-only ports like 80/443, then downgrade themselves to a non root user (through a process which I'm not familiar with).

I'd like to be able to do the same in a Java environment.

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On ServerFault theres a similar question with a bunch of different solutions.

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