Sending a WrapperPlayServerMultiBlockChange packet.

PlayServerMultiBlockChange.java

package com.comphenix.example;

import org.bukkit.Location;
import org.bukkit.command.Command;
import org.bukkit.command.CommandSender;
import org.bukkit.entity.Player;
import org.bukkit.plugin.java.JavaPlugin;

public class PlayServerMultiBlockChange extends JavaPlugin {
    @Override
    public boolean onCommand(CommandSender sender, Command command, String label, String[] args) {
        if (sender instanceof Player) {
            Player reciever = (Player) sender;
            Location loc = reciever.getLocation(); 
            WrapperPlayServerMultiBlockChange change = new WrapperPlayServerMultiBlockChange();
        
            // Construct the block changes
            BlockChangeArray changeArray = new BlockChangeArray(64);
            int index = 0;
            
            // Create a 4x4x4 stone cube
            for (int x = 0; x < 4; x++) {
                for (int z = 0; z < 4; z++) {
                    for (int y = 0; y < 4; y++) {
                        changeArray.getBlockChange(index++).
                            setBlockID(1).
                            setMetadata(0).
                            setRelativeX(x).
                            setRelativeZ(z).
                            setAbsoluteY(loc.getBlockY() + y);
                    }
                }
            }
            
            change.setChunkX(loc.getBlockX() >> 4);
            change.setChunkZ(loc.getBlockZ() >> 4);
            change.setRecordData(changeArray);
            change.sendPacket(reciever);
        }
        return true;
    }
}

This requires AbstractPacket, BlockChangeArray and WrapperPlayServerMultiBlockChange from PacketWrapper.