GamerulePlaceholder

Lightweight Paper plugin that exposes Minecraft gamerule values through PlaceholderAPI placeholders. Supports querying any world by name and the player’s current world.

Requirements

Paper 1.21.x (tested on 1.21.6).

PlaceholderAPI installed on the server.

Java 21 to run Paper 1.21.x.

Installation

Place the plugin JAR into the server’s plugins/ folder.

Ensure PlaceholderAPI is installed and enabled.

Restart the server; the expansion registers automatically at startup.

Placeholders per world scheme

%gamerule_<rule>_<world>%

Returns the value of gamerule in world .

Example: %gamerule_keepInventory_world% → “true” or “false”.

Placeholders scheme for current world

%gamerule_currentworld_<rule>%

Returns the gamerule value from the requesting player’s current world.

Requires player context (e.g., scoreboards, chat, GUIs that resolve placeholders for a player).

Example: %gamerule_currentworld_doDaylightCycle%

Notes

must match the exact gamerule name as in the server version (e.g., keepInventory, doDaylightCycle, playersSleepingPercentage).

If the world or gamerule doesn’t exist, the placeholder returns an empty string.

Boolean/Integer gamerules are returned as plain text (e.g., “true”, “100”).

Usage Examples

Scoreboard: Show whether players keep inventory in the overworld: %gamerule_keepInventory_world%

Player context: Show if day/night cycle runs in the player’s current dimension: %gamerule_currentworld_doDaylightCycle%

Performance

The plugin only reads values via the Paper API and performs no I/O, loops, or async tasks. Overhead is negligible even when placeholders update frequently (e.g., in scoreboards).

Building From Source

Prerequisites: JDK 21 and Maven.

In the project root, run: mvn clean package.

The plugin JAR will be produced in target/ and can be copied to plugins/.

Paper API and PlaceholderAPI are declared with provided scope; they must exist as plugins on the server.

Troubleshooting

Plugin loads but placeholders are empty: verify the world name and gamerule spelling; ensure a player context exists for gamerule_currentworld_.
Java version errors: use Java 21 for Paper 1.21.x.

Credits

Author: CrooLyyCheck

Built for Paper + PlaceholderAPI.