This plugin will allow you to "fill" the specified width of blocks around the worldborder with the preconfigured composition of blocks.  For instance, you can fill all blocks around the border with mix of SAND/SANDSTONE.  You can even specify the % of how different types of blocks are generated at different height levels.

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Dependency:
This plugin requires the use of WorldBorder plugin.

Commands:
  • N/A

Permissions:
  • N/A

Installation:
  • install WorldBorderFiller.jar in your plugins folder.
  • then, restart or load the plugin,
  • adjust your config.yml, 
  • shut down your server,
  • remove your world(s), which you listed in the config.yml
  • restart the server.

Since this plugin uses its own Generator for filling the border, if the chunks along the border were already generated, it will skip those chunks.  Hence it's best to install and generate chunks around the border on the fresh map.

Configuration:
For each world's border, you can specify how blocks are composed and what sort of blocks should be replaced by the AIR block.

Messages:
  ErrorMsg : "&c[WBFiller] : Some error occured."

HelpMessages:
  banner:
    msg: "=== &e[&aWorldBorderFiller Commands List (%version%)&e] &r==="
  help:
    msg: "&a/wbfill help : displays this help menu."
  reload:
    msg: "&a/wbfill reload : reloads config file."
    permission: "worldborderfiller.reload"
  debug:
    msg: "&a/wbfill debug <true|false> : turn on / off the debug mode."
    permission: "worldborderfiller.debug"

MaxTreeBlocks: 200

Worlds:
  world:  # world name
    Buffer: 32 # in blocks,  1 chunk = 16 blocks.
    NonFallingBlock : SANDSTONE
    # following blocks will be converted AIR blocks.
    ConvertToAir:
      - WOOD
      - LEAVES
      - LEAVES_2
      - LOG
      - LOG_2
      - VINE
      - HUGE_MUSHROOM_1
      - HUGE_MUSHROOM_2
      - LONG_GRASS
      - DOUBLE_PLANT
      - RED_MUSHROOM
      - BROWN_MUSHROOM

    # This is where you specify the composition of blocks at each Y-level
    Blocks:
      40:             # from level 40 and above
        SAND: 0.1     # 10% of blocks will be SAND blocks and 90% SANDSTONE
        SANDSTONE: 0.9
      50:             # from level 50 and above
        SAND: 0.2
        SANDSTONE: 0.8
      60:             # from level 60 and above
        SAND: 0.8
        SANDSTONE: 0.2
      0:              # from level 0 and above
        SAND: 1.0