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Project compiling on corretto 1.8 but not working.

Hi. I try to make an ability for 1.12.2. I was told corretto 1.8 works fine for this version. I have a local spigot 1.12.2 server and I play on minecraft version 1.12.2.
I made one ability and it works well (same version, spigot and everything), but I started developing a new one and this is where things stopped working.
1. I tried to set a new listener for EntityPotionEffectEvent, but I get an error in console that says server couldn't set it up, because such an event does not exist.
[02:19:49 ERROR]: [ProjectKorra] Plugin ProjectKorra v1.8.7 has failed to register events for class me.codeinsomnia.acupressure.PotionEndListener because org/bukkit/event/entity/EntityPotionEffectEvent does not exist.
2. When I try to play Sound.ARMOR_STAND_HIT (or any sound with armor_stand) my server crashes and I get that lil lovely stacktrace
I have no idea what to do. I was told corretto 1.8 will work fine, but it doesn't. When I tried to switch on corretto 11 or opendjk 14 it seems like they don't have a lot of things like ArrayList, String, Pair, etc. (and idk if this error wouldn't exist there too)

Code compiles without any errors. If it's needed, I'll provide it.