11:13:21 AM CONSOLE: reflective access by me.lucko.luckperms.common.dependencies.classloader.ReflectionClassLoader (file:/home/shady/McMyAdmin/Minecraft/plugins/LuckPerms-Bukkit-4.3.25.jar) to method java.net.URLClassLoader.addURL(java.net.URL)
11:13:21 AM CONSOLE: consider reporting this to the maintainers of me.lucko.luckperms.common.dependencies.classloader.ReflectionClassLoader
11:13:21 AM CONSOLE: --illegal-access=warn to enable warnings of further illegal reflective access operations
11:13:21 AM CONSOLE: illegal access operations will be denied in a future release

Use Java 8. In Java 9 and above they decided to throw in this warning when some people are adding libraries at runtime, which is stupid to say the least.

Please see the response linked in the issue above.