
PreventBuild
A simple but flexible mod that prevents unwanted player actions described in the custom configs
About this Mod
PreventBuild
Adds control to prevent the player from performing certain actions that are set in configs. Configs, in turn, have a very flexible structure that allows you to build complex logical conditions describing what actions the mod should prevent.
Original purpose of creating this mod was enhancing experience of hand-building map-arts without using any printers and easy-place mode. But now it's more than just preventing placing and breaking: you can prevent any right- or left-click actions, just make sure there is a suitable condition.
This mod is just cancelling the player's actions, so it's fully client-side.
How to use the mod
It's almost necessary to visit the Wiki to understand how to write a config, because there is no other way to write it except by hand.
There are a few files in config/preventbuild/:
conditions/- contains config .cfg filescondition_configs.json- defines which configurations are active by its individual nameore_dictionaries.json- defines custom ore dictionary lists for using in configs
Once you have created/updated your configs, you should update configs in the game using commands. Also configs are updating automatically when the player joins a world.
(For developers) Also you can find out how to create and register your own conditions that you will be able to use in the same config files.
Commands
/pb config list- display a list of configs with their status/pb config switch- enable/disable config by name /pb config update- reload all configs
Server restrictions of the conditions
Since I'm trying to keep gameplay fair and rules-friendly, I decided to give server owners the ability to restrict
some conditions that they can consider as "cheating-like" actions.
For now, there's only a few of such restrictions. To use them, you need to add the following strings to the plugin
message via the "preventbuild:restrictions" channel and send it to players on PlayerRegisterChannelEvent:
NoItemDamage - Disables all the "Item Damage" and "Item Durability" conditions
NoBlockState - Disables the "Block State" condition
NoAgeBlockState - Disables only the use of the "age" state in the "Block State" condition
ResetAll - Resets all restrictions
Example:
@EventHandler
public void onRegisterChannelJoin(PlayerRegisterChannelEvent event) {
if (event.getChannel().equals("preventbuild:restrictions")) {
Player player = event.getPlayer();
ByteArrayDataOutput out = ByteStreams.newDataOutput();
out.writeUTF("NoItemDamage NoAgeState");
player.sendPluginMessage(this, event.getChannel(), out.toByteArray());
}
}
Contacts
If you have some issues with the mod, any questions or just want to leave feedback, you are always welcome:
- GitHub: https://github.com/Redheris/PreventBuild/issues
- Discord: Server or @redheris
Note
Well, this is my first relatively serious mod and especially the first one for public use. Thanks for visiting :)
Available Versions
How to Install PreventBuild on Your Server
Order Server
Order a Minecraft Java server with at least 3 GB RAM (4 GB recommended).
Set fabric Loader
In the panel under "Egg", select the fabric loader and matching Minecraft version (1.21.11).
Install Mod
Open the mod browser in the dashboard and search for "PreventBuild". Click "Install" – done! Alternatively, upload the .jar via SFTP to the /mods folder.
Compatibility
Mod Loaders
Minecraft Versions
1.21.11, 1.21.10, 1.21.9 (+5 more)
Server-side
✗ UnsupportedRecommended RAM
4 GB(min. 3 GB)Frequently Asked Questions
PreventBuild server crashes on startup – what to do?
Most common cause: wrong fabric version or insufficient RAM. Check the server log (latest.log) for "OutOfMemoryError" or "Mixin" errors. With Mado Hosting: ensure at least 3 GB RAM is allocated and the loader matches the mod version (1.21.11). You can switch loaders with one click in the panel.
Is PreventBuild compatible with fabric?
PreventBuild officially supports fabric for Minecraft 1.21.11, 1.21.10, 1.21.9. The Mado dashboard automatically detects incompatible loader combinations.
Server lagging with PreventBuild – how to optimize performance?
Recommended RAM: 4 GB (per 8 players). Use /spark profiler to check if PreventBuild consumes the most tick time. Common fixes: reduce server view-distance to 8-10, install "performant" or "starlight" as supplementary mods on Forge. With Mado Hosting, your server runs on NVMe SSDs with dedicated CPU cores for minimal latency.
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Rent Modded Server
Install PreventBuild with just one click on your server.