Bedrock Allow Deny Border

A faithful, client-side Fabric mod for Minecraft Java Edition 1.21 that brings the Bedrock / Education Edition Allow, Deny and Border blocks to Java Edition - designed for single-player worlds and LAN co-op world building. Every rule is evaluated consistently on all clients, and the host's configuration is synced live to everyone on the LAN.

What does it add?

Three "teacher block"-style utility blocks in a dedicated creative tab:

Block	Purpose
Allow Block	Marks a column as buildable even where building is restricted.
Deny Block	Prohibits block placement and breaking in its whole column (nearest rule below a position wins; the highest stacked block takes precedence).
Border Block	An invisible wall that blocks the entire (x, z) column at every Y - it cannot be crossed by jumping over it, flying above it, or tunnelling underneath it.

The blocks are extremely blast-resistant and cannot be moved by pistons, so they are safe map-making tools.

Key features

• Column-based protection - one allow/deny block governs building rules across its whole vertical column, exactly like the Bedrock original.
• Whole-column border barrier - the border wall exists from the world bottom to the world top at the block's (x, z) position; passing rules apply at every height.
• Two border modes, selectable in-game:
  • Bedrock-like (default): blocks unprivileged players and monsters; projectiles, spectators, privileged players, vex and the ender dragon may pass.
  • Block all entities: blocks every entity except privileged players and spectators (arrows, ender pearls, fireballs, shulker bullets etc. are stopped too).
• Flexible privilege system:
  • global whitelist (/allowdeny whitelist ...),
  • per-block NBT whitelist stored on the item / block entity,
  • operator bypass (permission level 2, optionally requiring Creative mode).
• Visual config screen - a "Config" button on the Mods screen when Mod Menu and Cloth Config are installed (both optional at runtime).
• Full command suite for server-style control: /allowdeny config, /allowdeny whitelist, /allowdeny reload, /allowdeny query.
• Live LAN sync - the host's config and whitelist are pushed to every connected player automatically.
• Invisible border walls can be visualised with an optional red particle effect.

Why would you want it?

If you build adventure maps, mini-games or protected co-op areas in single-player or on a LAN host, this mod gives you Bedrock-grade build control: forbid building with Deny blocks, carve out buildable zones with Allow blocks, and seal off areas with unbreakable, impassable Border walls - without needing a full server setup.

Requirements

• Minecraft Java 1.21
• Fabric Loader >= 0.19.4 and Fabric API
• (optional) Mod Menu 11.x and Cloth Config 15.x for the config GUI

All players joining a LAN world need the same mod version installed.

Configuration

Graphical: Mods screen -> Bedrock Allow Deny Border -> Config. Command line (OP level 2): see the in-game help of /allowdeny, e.g.:

/allowdeny config borderMode bedrock_like
/allowdeny config borderMode block_all_entities
/allowdeny whitelist add <player>

Building from source

JDK 21+ required; see the GitHub repository for the toolchain versions.

./gradlew build

Artifacts land in build/libs/. CI automatically builds every push and publishes tagged releases.

License and credits

• License: MIT (see the LICENSE file inside the repository and the JAR).
• Authored and maintained by zihan_ds.
• Behavior follows the Bedrock / Education Edition Allow, Deny and Border blocks (see the Minecraft Wiki).
• Source code: https://github.com/zihan-ds/minecraft-bedrock-adb
• A Simplified Chinese user manual (Markdown) is included in the repository and inside the JAR.