[1.10.2] How to replace an entity's doLivingUpdate() method?

[CaptainSwag101]

Hello, I'm trying to make a mod which changes the Enderman's default particles with clouds of smoke particles, so they look like they did back in the Beta 1.9 prereleases. I'm making a custom class "CustomEnderman" which extends EntityEnderman so I don't have to duplicate tons code that I don't want to modify. However, the doLivingUpdate() method where the vanilla class spawns the particles also needs to call its parent method EntityMob.doLivingUpdate(), but I can't do that in my custom class because that would call the vanilla particle-spawning code that I want to disable. I could just make a complete duplicate of the EntityEnderman class and extend EntityMob instead, but that means I have to copy hundreds of lines of code every time I want to change 3 lines, and I feel like there must be a better way of doing it.

 

I've also looked into Access Transformers and Coremods, but all the tutorials are very out-of-date, and they don't really explain how to modify their sample code to use it in other situations.

 

tl;dr Basically, my CustomEnderman class extends EntityEnderman, which extends EntityMob. So, is there any way I can call EntityMob.doLivingUpdate() without having to call EntityEnderman.doLivingUpdate()? Any help would be appreciated!

Edited May 23, 2017 by CaptainSwag101
Beta 1.9, not release 1.9

[Draco18s]

No.

https://stackoverflow.com/a/11935996/1663383

[CaptainSwag101]

I see. In that case, what would you recommend I do to solve this issue? Should I just copy/paste the whole EntityEnderman class and extend EntityMob instead, or should I use ASM to modify the vanilla class, etc.?

[CaptainSwag101]

This doesn't seem to work properly for me, I keep getting a this error: 

java.lang.IllegalAccessException: no private access for invokespecial: class net.minecraft.entity.monster.EntityMob, from net.minecraft.entity.monster.EntityMob/public
	at java.lang.invoke.MemberName.makeAccessException(MemberName.java:850) ~[?:1.8.0_131]
	at java.lang.invoke.MethodHandles$Lookup.checkSpecialCaller(MethodHandles.java:1572) ~[?:1.8.0_131]
	at java.lang.invoke.MethodHandles$Lookup.findSpecial(MethodHandles.java:1002) ~[?:1.8.0_131]

 Here's the relevant code:

    // static and final are important, they ensure this can be optimized by the JVM
    protected static final MethodHandle mobLivingUpdate;

    static {
        try {
            // with lookup().in(EntityMob.class) we obtain access to things that are "private" in EntityMob.
            // findSpecial invokes the method in EntityMob.class without checking for overriding methods (such as the one in EntityEnderman)
            mobLivingUpdate = MethodHandles.lookup().in(EntityMob.class).findSpecial(EntityMob.class, "onLivingUpdate", MethodType.methodType(void.class), EntityMob.class);
        } catch (Exception e) {
            throw new RuntimeException(e);
        }
    }

    /**
     * Called frequently so the entity can update its state every tick as required. For example, zombies and skeletons
     * use this to react to sunlight and start to burn.
     */
    @Override
    public void onLivingUpdate()
    {
        if (this.world.isRemote)
        {
            for (int i = 0; i < 2; ++i)
            {
                if (oldAppearance) {
                    this.world.spawnParticle(EnumParticleTypes.SMOKE_LARGE, this.posX + (this.rand.nextDouble() - 0.5D) * (double)this.width, this.posY + this.rand.nextDouble() * (double)this.height, this.posZ + (this.rand.nextDouble() - 0.5D) * (double)this.width, 0.0D, 0.0D, 0.0D);
                } else {
                    this.world.spawnParticle(EnumParticleTypes.PORTAL, this.posX + (this.rand.nextDouble() - 0.5D) * (double)this.width, this.posY + this.rand.nextDouble() * (double)this.height - 0.25D, this.posZ + (this.rand.nextDouble() - 0.5D) * (double)this.width, (this.rand.nextDouble() - 0.5D) * 2.0D, -this.rand.nextDouble(), (this.rand.nextDouble() - 0.5D) * 2.0D, new int[0]);
                }
            }
        }

        this.isJumping = false;

        try {
            // invokeExact is important, it ensures that this can be optimized by the JVM
            mobLivingUpdate.invokeExact((EntityMob) this);
        } catch (Throwable x) {
            throw new RuntimeException(x);
        }
    }

 

Edited May 24, 2017 by CaptainSwag101
Added additional error info