Fetch 9 blocks below player

Heeey !

I started learning how to write a little Bukkit plugin again, but I am currently stuck.

I am trying (just for learning purposes) to write a "Jesus" method: Once a player walks on water, I want to transform that water block below him into ice, and then transform it back into water.

It all works perfectly! I just put the location of the block in a Hashmap and then check it later. However, if you only transform the block right below the player, walking on water is no fun - because the block actually is not frozen before you are right above a new block, thereby the client always "assumes" that you are about to fall into water. No problem, I decided to just transform the 9 blocks below the player into ice, then the player should be able to walk fluently.

I didn't expect it to be a problem, I just have to make an array and adjust the Z and X coordinates - at least that's what I thought. Somehow, it does not select the right blocks

I am trying to select the blocks as followed:

Code:java

Location loc = player.getLocation();
loc.setY(loc.getY()-1);
 
Location[] locations = new Location[9];
for (int i = 0; i<3; i++) {
    for (int j = 0; j<3; j++) {
        locations[3*i+j] = loc;
        locations[3*i+j].setX(locations[3*i+j].getX()+j-1);
        locations[3*i+j].setZ(locations[3*i+j].getZ()+i-1);
    }
}
 

But when I then try to set the blocks to ice:

Code:java

for (Location location: locations) {
    Block block = location.getBlock();
    if (block.getType() == Material.WATER || block.getType() ==  Material.STATIONARY_WATER) {
        block.setType(Material.ICE);
    }
}
 

It works as if I hadn't changed any code - only the block below the player is frozen

 

This solution is a bit longer, but it should work:

Code:

int x = l.getblockxX();
int y = l.getBlockY();
int z = l.getblockZ();
Location l1 = new Location(l.getWorld(), x - 1, y, z);
Location l1 = new Location(l.getWorld(), x - 1, y, z - 1);
Location l1 = new Location(l.getWorld(), x - 1, y, z + 1);
Location l1 = new Location(l.getWorld(), x + 1, y, z);
Location l1 = new Location(l.getWorld(), x + 1, y, z + 1);
Location l1 = new Location(l.getWorld(), x + 1, y, z - 1);
Location l1 = new Location(l.getWorld(), x, y, z - 1);
Location l1 = new Location(l.getWorld(), x, y, z + 1);

That is a way to get the blocks around you.
I use it, and with me it works.

 

Code:java

 
Location location = blocklocation.subtract(1,0,1);
List<Location> locations = new ArrayList<Location>();
for (int x = 0 ; x < 2 ; x++) {
   for (int z = 0 ; z < 2; z++) {
      locations.add(location.clone().add(x,0,z));
   }
}