I have been trying to make a vein mining tool, similar to the dark matter pickaxe from EE2, and my code will remove all the blocks in the vein, and should give them to the player, but the new blocks only show up when I save and quit the world, and reload it. I don't need to close Minecraft, just the world. I have a feeling it's something to do with the !world.isRemote check, but putting it on the outside causes a crash, so I have to put it inside. Here is my code:

 

public boolean onItemUse(ItemStack itemStack, EntityPlayer player, World world, int i, int j, int k, int l, float a, float b, float c)
{
	int veinSize = 0;
	Block originalBlock = null;
if(!world.isRemote)
{

	if(true)
	{
		AlchemicalExchange.log.info("Has Used Item");
		List<V3> vein = new ArrayList<V3>();
		originalBlock = world.getBlock(i, j, k);

		if(originalBlock instanceof BlockOre)
		{
			AlchemicalExchange.log.info("Block is an ore");
			vein.add(0, new V3(originalBlock, i, j, k));

			for(int x=0; x<vein.size(); x++)
			{
				AlchemicalExchange.log.info("Running for loop");
				if(vein.get(x) != null)
				{
					V3 adjBlock = new V3(vein.get(x).block, vein.get(x).x, vein.get(x).y, vein.get(x).z);

					AlchemicalExchange.log.info("Checking for adjacent ore block");
					/*X AXIS*/
					if(world.getBlock((int)adjBlock.x+1, (int)adjBlock.y, (int)adjBlock.z) == originalBlock)
					{
						vein.add(new V3(adjBlock.block, adjBlock.x+1, adjBlock.y, adjBlock.z));
						world.setBlockToAir((int)adjBlock.x+1, (int)adjBlock.y, (int)adjBlock.z);
						veinSize++;
						AlchemicalExchange.log.info("Found adjacent ore block on the X Axis (Right)");
					}
					if(world.getBlock((int)adjBlock.x-1, (int)adjBlock.y, (int)adjBlock.z) == originalBlock)
					{
						vein.add(new V3(adjBlock.block, adjBlock.x-1, adjBlock.y, adjBlock.z));
						world.setBlockToAir((int)adjBlock.x-1, (int)adjBlock.y, (int)adjBlock.z);
						veinSize++;
						AlchemicalExchange.log.info("Found adjacent ore block on the X Axis (Left)");
					}

					/*Y AXIS*/
					if(world.getBlock((int)adjBlock.x, (int)adjBlock.y+1, (int)adjBlock.z) == originalBlock)
					{
						vein.add(new V3(adjBlock.block, adjBlock.x, adjBlock.y+1, adjBlock.z));
						world.setBlockToAir((int)adjBlock.x, (int)adjBlock.y+1, (int)adjBlock.z);
						veinSize++;
						AlchemicalExchange.log.info("Found adjacent ore block on the Y Axis (Above)");
					}
					if(world.getBlock((int)adjBlock.x, (int)adjBlock.y-1, (int)adjBlock.z) == originalBlock)
					{
						vein.add(new V3(adjBlock.block, adjBlock.x, adjBlock.y-1, adjBlock.z));
						world.setBlockToAir((int)adjBlock.x, (int)adjBlock.y-1, (int)adjBlock.z);
						veinSize++;
						AlchemicalExchange.log.info("Found adjacent ore block on the Y Axis (Below)");
					}

					/*Z AXIS*/
					if(world.getBlock((int)adjBlock.x, (int)adjBlock.y, (int)adjBlock.z+1) == originalBlock)
					{
						vein.add(new V3(adjBlock.block, adjBlock.x, adjBlock.y, adjBlock.z+1));
						world.setBlockToAir((int)adjBlock.x, (int)adjBlock.y, (int)adjBlock.z+1);
						veinSize++;
						AlchemicalExchange.log.info("Found adjacent ore block on the Z Axis (Front)");
					}
					if(world.getBlock((int)adjBlock.x, (int)adjBlock.y, (int)adjBlock.z-1) == originalBlock)
					{
						vein.add(new V3(adjBlock.block, adjBlock.x, adjBlock.y, adjBlock.z-1));
						world.setBlockToAir((int)adjBlock.x, (int)adjBlock.y, (int)adjBlock.z-1);
						veinSize++;
						AlchemicalExchange.log.info("Found adjacent ore block on the Z Axis (Back)");
					}
				}
			}

			if(vein.size() == 1)
			{
				world.setBlockToAir(i, j, k);
				veinSize++;
			}
		}
	}
}
player.inventory.addItemStackToInventory(new ItemStack(originalBlock, veinSize, originalBlock.getDamageValue(world, i, j, k)));
return true;
}

1. What is that 'if(true)'? (Do you know Basic Java?)

2. Are you meaning that the change doesn't get saved and reloaded?

I do know some Java, but I didn't know the name of the onItemUse function at the time, so I found a snipped online which included that bit, so I thought I needed it to be there.

 

What I mean about the change is that say there were three ores in a vein. When I use the item on it, the ores disappear, but I need to save and quit to menu, and reload the world to see the three ores in my inventory.

Removing the if(true) changes nothing, so I'm going to assume that piece of code was useless.