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A Minecraft Bedrock Edition server software implementation made in Java from scratch which supports all new features.

There is a newer version: 1.6.0.1-PN

package cn.nukkit.block;

import cn.nukkit.entity.Entity;
import cn.nukkit.entity.item.EntityFallingBlock;
import cn.nukkit.event.block.BlockFallEvent;
import cn.nukkit.level.Level;
import cn.nukkit.nbt.tag.*;


/**
 * @author rcsuperman (Nukkit Project)
 */
public abstract class BlockFallable extends BlockSolid {

    protected BlockFallable() {
    }

    public int onUpdate(int type) {
        if (type == Level.BLOCK_UPDATE_NORMAL) {
            Block down = this.down();
            if (down.getId() == AIR || down instanceof BlockFire || down instanceof BlockLiquid || down.getLevelBlockAtLayer(1) instanceof BlockLiquid) {
                BlockFallEvent event = new BlockFallEvent(this);
                this.level.getServer().getPluginManager().callEvent(event);
                if (event.isCancelled()) {
                    return type;
                }

                this.level.setBlock(this, Block.get(Block.AIR), true, true);
                EntityFallingBlock fall = createFallingEntity(new CompoundTag());

                fall.spawnToAll();
            }
        }
        return type;
    }

    protected EntityFallingBlock createFallingEntity(CompoundTag customNbt) {
        CompoundTag nbt = new CompoundTag()
                .putList(new ListTag("Pos")
                        .add(new DoubleTag("", this.x + 0.5))
                        .add(new DoubleTag("", this.y))
                        .add(new DoubleTag("", this.z + 0.5)))
                .putList(new ListTag("Motion")
                        .add(new DoubleTag("", 0))
                        .add(new DoubleTag("", 0))
                        .add(new DoubleTag("", 0)))

                .putList(new ListTag("Rotation")
                        .add(new FloatTag("", 0))
                        .add(new FloatTag("", 0)))
                .putInt("TileID", this.getId())
                .putByte("Data", this.getDamage());

        for (Tag customTag : customNbt.getAllTags()) {
            nbt.put(customTag.getName(), customTag.copy());
        }

        EntityFallingBlock fall = (EntityFallingBlock) Entity.createEntity("FallingSand", this.getLevel().getChunk((int) this.x >> 4, (int) this.z >> 4), nbt);

        if (fall != null) {
            fall.spawnToAll();
        }

        return fall;
    }
}