[1.12]How to give player potion effects and make blind doesn't stop sprinting

[Shuaiouke]

I wanted to make a mod for me and my friends to play with and it will give player blindness 10 when they are standing still and 5 when they are running, then I found this:

        if (this.isSprinting())
        {
            this.jumpMovementFactor = (float)((double)this.jumpMovementFactor + (double)this.speedInAir * 0.3D);
        }

so I want to do EntityLivingBase.addPotionEffect(new PotionEffect(MobEffects.BLINDNESS, 20, 1)); here but eclipse told me I need to change addPotionEffect to static, why.

 

Edited:

And since blindness stops sprinting so I need to make blindness doesn't stop sprinting and I have no idea how

Edited January 28, 2019 by Shuaiouke

[Cadiboo]

14 minutes ago, Shuaiouke said:

eclipse told me I need to change addPotionEffect to static, why.

Context is everything, post your code

[Shuaiouke]

11 minutes ago, Cadiboo said:

Context is everything, post your code

just MCP for minecraft 1.12 in EntityPlayer.java

[Cadiboo]

You’re directly modifying minecraft classes using MCP?

[Shuaiouke]

emm yes? what's wrong with that or you have a way to pull it out? I have a package called hack because of no reason and has a Var class inside just with vars

[Shuaiouke]

I put

EntityLivingBase.addPotionEffect(new PotionEffect(MobEffects.BLINDNESS, 20, 1));

in it and MC crashed as soon as I open the world and if I changed addPotionEffect to static, it doesn't crash when I load, but when I sleep

[Cadiboo]

Directly modifying the minecraft jar has not been required or supported since beta 1.4 IIRC. Do not do it, it breaks all other mods and mod loaders, may not work at all, can cause weird issues, is a security issue and corrupts installs. Do not do it! Especially if you don’t know java, shown by 

35 minutes ago, Shuaiouke said:

eclipse told me

 

[Draco18s]

11 hours ago, Shuaiouke said:

but eclipse told me

Eclipse Quick-Fixes are rarely the correct answer. ESPECIALLY if you don't know WTF you're doing.

11 hours ago, Shuaiouke said:

EntityLivingBase.addPotionEffect

Which entity living base do you want to effect? Because EntityLivingBase is a class.

11 hours ago, Shuaiouke said:

emm yes? what's wrong with that

"I'm not using Forge and I don't know what's wrong, maybe I should ask on the Forge forums for help!"

Edited January 29, 2019 by Draco18s

[Shuaiouke]

it crashes whether I change or not and EntityLivingBase.java