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I Created A Java Repl , How To Keep My Java Project Alive
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SixBeeps
You can either get the hacker plan OR you can set up a server using Sun's httpserver library then ping that using UptimeRobot.
xfinnbar
You need to buy the hacker plan, it's on sale right now: https://replit.com/pricing
You can use mat1's pinger!
You can find it here
Hopefully this answers your question :)