http://www.bukkit.fr/index.php?/topic/9591-stocker-des-blocks-et-des-locations-dans-un-fichier-de-configuration/

Snippet.java

public static class Save {
    private final Block    block;
    private final byte     data;
    private final Material type;

    @SuppressWarnings("deprecation")
    public Save(final Block block) {
        this.block = block;
        type = block.getType();
        data = block.getData();
    }

    @SuppressWarnings("deprecation")
    public void restore() {
        block.setType(type);
        block.setData(data);
    }
}

public static final BlockFace[] AXES = { BlockFace.NORTH, BlockFace.EAST, BlockFace.SOUTH, BlockFace.WEST };

public void createWall(final Player player) {
    final List<Save> saves = new ArrayList<Save>();
    final BlockFace axis = AXES[Math.round(player.getLocation().getYaw() / 90f) & 0x3];
    for (int xz = 0; xz < 5; xz++) {
        for (int y = 0; y < 3; y++) {
            final int x = axis.getModX() + (axis.getModX() + 1) % 2 * (-2 + xz);
            final int z = axis.getModZ() + (axis.getModZ() + 1) % 2 * (-2 + xz);
            final Block block = player.getLocation().clone().add(x, y, z).getBlock();
            saves.add(new Save(block));
            block.setType(Material.BRICK);
        }
    }
    Bukkit.getScheduler().scheduleSyncDelayedTask(this, new Runnable() {

        @Override
        public void run() {
            for (final Save save : saves)
                save.restore();
        }
    }, 5 * 20L);
}