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[Solved] Custom Slime Block not working with Pistons


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I have created a new slime block and it extends the SlimeBlock class, so why doesn't it work with pistons like a normal slime block does? It doesn't pull blocks with it, or bounce the player when it hits them being pushed by the piston. The player bounces fine when landing on it, but that is it.

The Class:

package com.nulldev.modbase.blocks;

import net.minecraft.block.AbstractBlock;
import net.minecraft.block.SlimeBlock;
import net.minecraft.block.material.Material;
import net.minecraft.entity.Entity;
import net.minecraft.util.math.BlockPos;
import net.minecraft.world.World;

public class PinkSlimeBlock extends SlimeBlock {

    public PinkSlimeBlock() {
        super(AbstractBlock.Properties.create(Material.SPONGE).hardnessAndResistance(0, 1));

    public void onFallenUpon(World worldIn, BlockPos pos, Entity entityIn, float fallDistance) {
        double x = entityIn.getMotion().getX();
        double y = entityIn.getMotion().getY() * 1.75;
        double z = entityIn.getMotion().getZ();

        entityIn.setMotion(x, y, z);
        super.onFallenUpon(worldIn, pos, entityIn, fallDistance);



Edit: I have also tried adding this:

public boolean isSlimeBlock(BlockState state) {
  return true;

It changed nothing

Edited by NullDev
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11 hours ago, vemerion said:

there is also IForgeBlock.isStickyBlock() and IForgeBlock.canStickTo() that you might need to override.

I have overriden both of them and nothing has changed. They both always return true.

public boolean isStickyBlock(BlockState state) {
	return true;

public boolean canStickTo(BlockState state, BlockState other) {
	return true;


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