JavAlert

Send native OS alerts and notifications to players! Perfect for trolling friends, server announcements, quest systems, and automated interactions. Alerts appear outside the game as real system notifications on Windows, macOS, and Linux.

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forgeneoforgesocialtechnology

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About this Mod

JavAlert

Full documentation: Wiki

Features

Native System Notifications - Real OS notifications outside the game
Message Boxes - Native dialog boxes (Windows, macOS, Linux)
Custom In-Game Screens - Beautiful custom alert screens with buttons
Alert Beacon Block - Automatically trigger alerts when players enter detection radius
Conditional Triggers - Trigger based on inventory, stats, location, biome, and more
Templates - Save and reuse alert configurations
Multi-Language Support - English, Spanish, French, German
API Integration - Comprehensive API for mod developers

Quick Start

Place an Alert Beacon block in your world
Right-click to configure radius, message, and display type
Set trigger mode (ENTER, EXIT, STAY, PROXIMITY, PORTAL)
Add conditions and filters (optional)
Save and players will receive alerts automatically!

Commands

/alert <target> simple <message> - Simple alert
/alert <target> messagebox <title> <message> - Messagebox alert
/alert <target> notification <message> - Notification alert
/alert <target> customscreen <title> <primaryButton> [secondaryButton] <message> - Custom screen
/alert manage - Management GUI (OP Level 5)
/alert documentation - In-game documentation

API for Mod Developers

See API Documentation.

Installation

Download JavAlert-1.2.jar from Modrinth
Place in your mods folder
Restart Minecraft

Configuration

Access configuration via the "JavAlert Config" button on the main menu (icon next to Singleplayer button).

Documentation

Complete documentation: Wiki

You can also use /alert documentation in-game for interactive documentation.

Technical Details

Minecraft: 1.20.1
Forge: 47.4.13+
Java: 17+
License: All Rights Reserved

Developer note :

This is my first Minecraft mod, so i am just testing things with this mod and other mods are coming soon !

Available Versions

JavAlert - 1.2 "The Prank update"release

MC 1.21.1neoforge

January 21, 2026

JavAlert 1.0 - Forgerelease

MC 1.20.1forge

November 22, 2025

How to Install JavAlert on Your Server

Order Server

Order a Minecraft Java server with at least 3 GB RAM (4 GB recommended).

Set forge Loader

In the panel under "Egg", select the forge loader and matching Minecraft version (1.21.1).

Install Mod

Open the mod browser in the dashboard and search for "JavAlert". Click "Install" – done! Alternatively, upload the .jar via SFTP to the /mods folder.

Compatibility

Mod Loaders

forgeneoforge

Minecraft Versions

1.21.1, 1.20.1

Server-side

✓ Required

Recommended RAM

4 GB(min. 3 GB)

Frequently Asked Questions

JavAlert server crashes on startup – what to do?

Most common cause: wrong forge 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 (1.21.1). You can switch loaders with one click in the panel.

Is JavAlert compatible with forge and neoforge?

JavAlert officially supports forge, neoforge for Minecraft 1.21.1, 1.20.1. The Mado dashboard automatically detects incompatible loader combinations.

Server lagging with JavAlert – how to optimize performance?

Recommended RAM: 4 GB (per 8 players). Use /spark profiler to check if JavAlert 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.