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Initial commit: JS-powered Minestom server with hot-reloading and Gitea Action
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Zephrynis
2026-01-25 22:49:51 +00:00
parent b402cc8eca
commit dba3e818e8
12 changed files with 720 additions and 0 deletions
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32
.gitea/workflows/build.yaml Normal file
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name: Build JStom
on:
push:
branches: [ "main" ]
pull_request:
branches: [ "main" ]
jobs:
build:
runs-on: ubuntu-latest
steps:
- name: Checkout repository
uses: actions/checkout@v4
- name: Set up JDK 25
uses: actions/setup-java@v4
with:
java-version: '25-ea'
distribution: 'temurin'
# Falls back to other distributions if Temurin 25 isn't available,
# or Oracle OpenJDK if specific EA builds are needed.
- name: Setup Gradle
uses: gradle/actions/setup-gradle@v3
- name: Grant execute permission for gradlew
run: chmod +x gradlew
- name: Build with Gradle
run: ./gradlew build

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.gitignore vendored Normal file
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# Gradle
.gradle
build/
!gradle/wrapper/gradle-wrapper.jar
!**/src/main/**/build/
!**/src/test/**/build/
# Java
*.class
*.log
*.ctxt
.mtj.tmp/
*.jar
*.war
*.nar
*.ear
*.zip
*.tar.gz
*.rar
# IntelliJ IDEA
.idea/
*.iml
*.iws
*.ipr
out/
# Eclipse
.classpath
.project
.settings/
bin/
# VS Code
.vscode/
# System
.DS_Store
Thumbs.db
# Project specific
*.log

38
build.gradle.kts Normal file
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plugins {
id("java")
id("application")
}
group = "net.jstom"
version = "1.0-SNAPSHOT"
repositories {
mavenCentral()
maven("https://jitpack.io") // For Minestom
}
dependencies {
// Minestom - using master-SNAPSHOT
implementation("com.github.Minestom:Minestom:master-SNAPSHOT")
// GraalJS for JavaScript engine
implementation("org.graalvm.polyglot:polyglot:24.1.2")
implementation("org.graalvm.polyglot:js:24.1.2")
// Logging
implementation("org.slf4j:slf4j-simple:2.0.9")
}
application {
mainClass.set("net.jstom.Main")
}
java {
toolchain {
languageVersion.set(JavaLanguageVersion.of(25))
}
}
tasks.withType<JavaCompile> {
options.encoding = "UTF-8"
}

7
gradle/wrapper/gradle-wrapper.properties vendored Normal file
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distributionBase=GRADLE_USER_HOME
distributionPath=wrapper/dists
distributionUrl=https\://services.gradle.org/distributions/gradle-9.0.0-bin.zip
networkTimeout=10000
validateDistributionUrl=true
zipStoreBase=GRADLE_USER_HOME
zipStorePath=wrapper/dists

251
gradlew vendored Normal file
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#!/bin/sh
#
# Copyright © 2015 the original authors.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# https://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
#
# SPDX-License-Identifier: Apache-2.0
#
##############################################################################
#
# Gradle start up script for POSIX generated by Gradle.
#
# Important for running:
#
# (1) You need a POSIX-compliant shell to run this script. If your /bin/sh is
# noncompliant, but you have some other compliant shell such as ksh or
# bash, then to run this script, type that shell name before the whole
# command line, like:
#
# ksh Gradle
#
# Busybox and similar reduced shells will NOT work, because this script
# requires all of these POSIX shell features:
# * functions;
# * expansions «$var», «${var}», «${var:-default}», «${var+SET}»,
# «${var#prefix}», «${var%suffix}», and «$( cmd )»;
# * compound commands having a testable exit status, especially «case»;
# * various built-in commands including «command», «set», and «ulimit».
#
# Important for patching:
#
# (2) This script targets any POSIX shell, so it avoids extensions provided
# by Bash, Ksh, etc; in particular arrays are avoided.
#
# The "traditional" practice of packing multiple parameters into a
# space-separated string is a well documented source of bugs and security
# problems, so this is (mostly) avoided, by progressively accumulating
# options in "$@", and eventually passing that to Java.
#
# Where the inherited environment variables (DEFAULT_JVM_OPTS, JAVA_OPTS,
# and GRADLE_OPTS) rely on word-splitting, this is performed explicitly;
# see the in-line comments for details.
#
# There are tweaks for specific operating systems such as AIX, CygWin,
# Darwin, MinGW, and NonStop.
#
# (3) This script is generated from the Groovy template
# https://github.com/gradle/gradle/blob/HEAD/platforms/jvm/plugins-application/src/main/resources/org/gradle/api/internal/plugins/unixStartScript.txt
# within the Gradle project.
#
# You can find Gradle at https://github.com/gradle/gradle/.
#
##############################################################################
# Attempt to set APP_HOME
# Resolve links: $0 may be a link
app_path=$0
# Need this for daisy-chained symlinks.
while
APP_HOME=${app_path%"${app_path##*/}"} # leaves a trailing /; empty if no leading path
[ -h "$app_path" ]
do
ls=$( ls -ld "$app_path" )
link=${ls#*' -> '}
case $link in #(
/*) app_path=$link ;; #(
*) app_path=$APP_HOME$link ;;
esac
done
# This is normally unused
# shellcheck disable=SC2034
APP_BASE_NAME=${0##*/}
# Discard cd standard output in case $CDPATH is set (https://github.com/gradle/gradle/issues/25036)
APP_HOME=$( cd -P "${APP_HOME:-./}" > /dev/null && printf '%s\n' "$PWD" ) || exit
# Use the maximum available, or set MAX_FD != -1 to use that value.
MAX_FD=maximum
warn () {
echo "$*"
} >&2
die () {
echo
echo "$*"
echo
exit 1
} >&2
# OS specific support (must be 'true' or 'false').
cygwin=false
msys=false
darwin=false
nonstop=false
case "$( uname )" in #(
CYGWIN* ) cygwin=true ;; #(
Darwin* ) darwin=true ;; #(
MSYS* | MINGW* ) msys=true ;; #(
NONSTOP* ) nonstop=true ;;
esac
CLASSPATH="\\\"\\\""
# Determine the Java command to use to start the JVM.
if [ -n "$JAVA_HOME" ] ; then
if [ -x "$JAVA_HOME/jre/sh/java" ] ; then
# IBM's JDK on AIX uses strange locations for the executables
JAVACMD=$JAVA_HOME/jre/sh/java
else
JAVACMD=$JAVA_HOME/bin/java
fi
if [ ! -x "$JAVACMD" ] ; then
die "ERROR: JAVA_HOME is set to an invalid directory: $JAVA_HOME
Please set the JAVA_HOME variable in your environment to match the
location of your Java installation."
fi
else
JAVACMD=java
if ! command -v java >/dev/null 2>&1
then
die "ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH.
Please set the JAVA_HOME variable in your environment to match the
location of your Java installation."
fi
fi
# Increase the maximum file descriptors if we can.
if ! "$cygwin" && ! "$darwin" && ! "$nonstop" ; then
case $MAX_FD in #(
max*)
# In POSIX sh, ulimit -H is undefined. That's why the result is checked to see if it worked.
# shellcheck disable=SC2039,SC3045
MAX_FD=$( ulimit -H -n ) ||
warn "Could not query maximum file descriptor limit"
esac
case $MAX_FD in #(
'' | soft) :;; #(
*)
# In POSIX sh, ulimit -n is undefined. That's why the result is checked to see if it worked.
# shellcheck disable=SC2039,SC3045
ulimit -n "$MAX_FD" ||
warn "Could not set maximum file descriptor limit to $MAX_FD"
esac
fi
# Collect all arguments for the java command, stacking in reverse order:
# * args from the command line
# * the main class name
# * -classpath
# * -D...appname settings
# * --module-path (only if needed)
# * DEFAULT_JVM_OPTS, JAVA_OPTS, and GRADLE_OPTS environment variables.
# For Cygwin or MSYS, switch paths to Windows format before running java
if "$cygwin" || "$msys" ; then
APP_HOME=$( cygpath --path --mixed "$APP_HOME" )
CLASSPATH=$( cygpath --path --mixed "$CLASSPATH" )
JAVACMD=$( cygpath --unix "$JAVACMD" )
# Now convert the arguments - kludge to limit ourselves to /bin/sh
for arg do
if
case $arg in #(
-*) false ;; # don't mess with options #(
/?*) t=${arg#/} t=/${t%%/*} # looks like a POSIX filepath
[ -e "$t" ] ;; #(
*) false ;;
esac
then
arg=$( cygpath --path --ignore --mixed "$arg" )
fi
# Roll the args list around exactly as many times as the number of
# args, so each arg winds up back in the position where it started, but
# possibly modified.
#
# NB: a `for` loop captures its iteration list before it begins, so
# changing the positional parameters here affects neither the number of
# iterations, nor the values presented in `arg`.
shift # remove old arg
set -- "$@" "$arg" # push replacement arg
done
fi
# Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
DEFAULT_JVM_OPTS='"-Xmx64m" "-Xms64m"'
# Collect all arguments for the java command:
# * DEFAULT_JVM_OPTS, JAVA_OPTS, and optsEnvironmentVar are not allowed to contain shell fragments,
# and any embedded shellness will be escaped.
# * For example: A user cannot expect ${Hostname} to be expanded, as it is an environment variable and will be
# treated as '${Hostname}' itself on the command line.
set -- \
"-Dorg.gradle.appname=$APP_BASE_NAME" \
-classpath "$CLASSPATH" \
-jar "$APP_HOME/gradle/wrapper/gradle-wrapper.jar" \
"$@"
# Stop when "xargs" is not available.
if ! command -v xargs >/dev/null 2>&1
then
die "xargs is not available"
fi
# Use "xargs" to parse quoted args.
#
# With -n1 it outputs one arg per line, with the quotes and backslashes removed.
#
# In Bash we could simply go:
#
# readarray ARGS < <( xargs -n1 <<<"$var" ) &&
# set -- "${ARGS[@]}" "$@"
#
# but POSIX shell has neither arrays nor command substitution, so instead we
# post-process each arg (as a line of input to sed) to backslash-escape any
# character that might be a shell metacharacter, then use eval to reverse
# that process (while maintaining the separation between arguments), and wrap
# the whole thing up as a single "set" statement.
#
# This will of course break if any of these variables contains a newline or
# an unmatched quote.
#
eval "set -- $(
printf '%s\n' "$DEFAULT_JVM_OPTS $JAVA_OPTS $GRADLE_OPTS" |
xargs -n1 |
sed ' s~[^-[:alnum:]+,./:=@_]~\\&~g; ' |
tr '\n' ' '
)" '"$@"'
exec "$JAVACMD" "$@"

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gradlew.bat vendored Normal file
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@rem
@rem Copyright 2015 the original author or authors.
@rem
@rem Licensed under the Apache License, Version 2.0 (the "License");
@rem you may not use this file except in compliance with the License.
@rem You may obtain a copy of the License at
@rem
@rem https://www.apache.org/licenses/LICENSE-2.0
@rem
@rem Unless required by applicable law or agreed to in writing, software
@rem distributed under the License is distributed on an "AS IS" BASIS,
@rem WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
@rem See the License for the specific language governing permissions and
@rem limitations under the License.
@rem
@rem SPDX-License-Identifier: Apache-2.0
@rem
@if "%DEBUG%"=="" @echo off
@rem ##########################################################################
@rem
@rem Gradle startup script for Windows
@rem
@rem ##########################################################################
@rem Set local scope for the variables with windows NT shell
if "%OS%"=="Windows_NT" setlocal
set DIRNAME=%~dp0
if "%DIRNAME%"=="" set DIRNAME=.
@rem This is normally unused
set APP_BASE_NAME=%~n0
set APP_HOME=%DIRNAME%
@rem Resolve any "." and ".." in APP_HOME to make it shorter.
for %%i in ("%APP_HOME%") do set APP_HOME=%%~fi
@rem Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
set DEFAULT_JVM_OPTS="-Xmx64m" "-Xms64m"
@rem Find java.exe
if defined JAVA_HOME goto findJavaFromJavaHome
set JAVA_EXE=java.exe
%JAVA_EXE% -version >NUL 2>&1
if %ERRORLEVEL% equ 0 goto execute
echo. 1>&2
echo ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH. 1>&2
echo. 1>&2
echo Please set the JAVA_HOME variable in your environment to match the 1>&2
echo location of your Java installation. 1>&2
goto fail
:findJavaFromJavaHome
set JAVA_HOME=%JAVA_HOME:"=%
set JAVA_EXE=%JAVA_HOME%/bin/java.exe
if exist "%JAVA_EXE%" goto execute
echo. 1>&2
echo ERROR: JAVA_HOME is set to an invalid directory: %JAVA_HOME% 1>&2
echo. 1>&2
echo Please set the JAVA_HOME variable in your environment to match the 1>&2
echo location of your Java installation. 1>&2
goto fail
:execute
@rem Setup the command line
set CLASSPATH=
@rem Execute Gradle
"%JAVA_EXE%" %DEFAULT_JVM_OPTS% %JAVA_OPTS% %GRADLE_OPTS% "-Dorg.gradle.appname=%APP_BASE_NAME%" -classpath "%CLASSPATH%" -jar "%APP_HOME%\gradle\wrapper\gradle-wrapper.jar" %*
:end
@rem End local scope for the variables with windows NT shell
if %ERRORLEVEL% equ 0 goto mainEnd
:fail
rem Set variable GRADLE_EXIT_CONSOLE if you need the _script_ return code instead of
rem the _cmd.exe /c_ return code!
set EXIT_CODE=%ERRORLEVEL%
if %EXIT_CODE% equ 0 set EXIT_CODE=1
if not ""=="%GRADLE_EXIT_CONSOLE%" exit %EXIT_CODE%
exit /b %EXIT_CODE%
:mainEnd
if "%OS%"=="Windows_NT" endlocal
:omega

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run.bat Normal file
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@echo off
call build\install\jstom\bin\jstom.bat

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scripts/index.js Normal file
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server.log("Hello from JavaScript!");
// Listen for player spawn
server.on('net.minestom.server.event.player.PlayerSpawnEvent', (event) => {
var player = event.getPlayer();
player.sendMessage("Welcome to the JS-powered Minestom server!");
server.log("Player " + player.getUsername() + " has spawned.");
});

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settings.gradle.kts Normal file
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rootProject.name = "jstom"

74
src/main/java/net/jstom/Main.java Normal file
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package net.jstom;
import net.jstom.script.ScriptManager;
import net.minestom.server.MinecraftServer;
import net.minestom.server.coordinate.Pos;
import net.minestom.server.entity.Player;
import net.minestom.server.event.GlobalEventHandler;
import net.minestom.server.event.player.AsyncPlayerConfigurationEvent;
import net.minestom.server.event.server.ServerListPingEvent;
import net.minestom.server.instance.InstanceContainer;
import net.minestom.server.instance.InstanceManager;
import net.minestom.server.instance.LightingChunk;
import net.minestom.server.instance.block.Block;
import java.io.File;
import java.util.Scanner;
public class Main {
public static void main(String[] args) {
// Initialize server
MinecraftServer minecraftServer = MinecraftServer.init();
InstanceManager instanceManager = MinecraftServer.getInstanceManager();
// Create the instance
InstanceContainer instanceContainer = instanceManager.createInstanceContainer();
// Set the ChunkGenerator
instanceContainer.setGenerator(unit ->
unit.modifier().fillHeight(0, 40, Block.GRASS_BLOCK)
);
instanceContainer.setChunkSupplier(LightingChunk::new);
// Add an event callback to specify the spawning instance (and the spawn position)
GlobalEventHandler globalEventHandler = MinecraftServer.getGlobalEventHandler();
globalEventHandler.addListener(AsyncPlayerConfigurationEvent.class, event -> {
final Player player = event.getPlayer();
event.setSpawningInstance(instanceContainer);
player.setRespawnPoint(new Pos(0, 42, 0));
});
// Initialize Script Manager
ScriptManager scriptManager = new ScriptManager(new File("scripts"));
scriptManager.load();
// Console thread for commands
new Thread(() -> {
Scanner scanner = new Scanner(System.in);
while (scanner.hasNextLine()) {
String line = scanner.nextLine();
String[] parts = line.split(" ");
String command = parts[0];
if (command.equalsIgnoreCase("reload")) {
if (parts.length > 1) {
String fileName = parts[1];
System.out.println("Reloading " + fileName + "...");
scriptManager.reload(fileName);
} else {
System.out.println("Reloading all scripts...");
scriptManager.reload();
}
} else if (command.equalsIgnoreCase("stop")) {
MinecraftServer.stopCleanly();
System.exit(0);
}
}
}).start();
System.out.println("Server starting on port 25565");
System.out.println("Type 'reload' to reload all scripts, or 'reload <filename.js>' for a specific file.");
// Start the server
minecraftServer.start("0.0.0.0", 25565);
}
}

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src/main/java/net/jstom/script/ScriptApi.java Normal file
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package net.jstom.script;
import net.minestom.server.MinecraftServer;
import net.minestom.server.event.Event;
import net.minestom.server.event.EventNode;
import org.graalvm.polyglot.Value;
import java.util.ArrayList;
import java.util.List;
import java.util.function.Consumer;
public class ScriptApi {
private final List<EventNode<Event>> registeredNodes = new ArrayList<>();
/**
* Registers an event listener from JavaScript.
* Usage in JS: server.on('net.minestom.server.event.player.PlayerLoginEvent', (event) => { ... });
*/
public void on(String eventClassName, Value callback) {
try {
Class<?> clazz = Class.forName(eventClassName);
if (!Event.class.isAssignableFrom(clazz)) {
System.err.println("[JStom] Class " + eventClassName + " is not an Event.");
return;
}
@SuppressWarnings("unchecked")
Class<? extends Event> eventClass = (Class<? extends Event>) clazz;
// Create a node for this listener so we can easily remove it later
var node = EventNode.all("script-node-" + System.nanoTime());
node.addListener(eventClass, event -> {
// Execute JS callback
synchronized (callback) {
if (callback.canExecute()) {
try {
callback.executeVoid(event);
} catch (Exception e) {
System.err.println("[JStom] Error in JS event listener:");
e.printStackTrace();
}
}
}
});
MinecraftServer.getGlobalEventHandler().addChild(node);
registeredNodes.add(node);
System.out.println("[JStom] Registered listener for " + eventClass.getSimpleName());
} catch (ClassNotFoundException e) {
System.err.println("[JStom] Could not find event class: " + eventClassName);
}
}
public void cleanup() {
System.out.println("[JStom] Cleaning up " + registeredNodes.size() + " event nodes...");
for (var node : registeredNodes) {
MinecraftServer.getGlobalEventHandler().removeChild(node);
}
registeredNodes.clear();
}
public void log(String message) {
System.out.println("[JS] " + message);
}
}

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src/main/java/net/jstom/script/ScriptManager.java Normal file
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package net.jstom.script;
import org.graalvm.polyglot.Context;
import org.graalvm.polyglot.HostAccess;
import org.graalvm.polyglot.Source;
import java.io.File;
import java.io.IOException;
import java.util.HashMap;
import java.util.Map;
public class ScriptManager {
private final File scriptsDir;
private final Map<String, ScriptEnv> loadedScripts = new HashMap<>();
public ScriptManager(File scriptsDir) {
this.scriptsDir = scriptsDir;
}
public void load() {
if (!scriptsDir.exists()) {
scriptsDir.mkdirs();
}
File[] files = scriptsDir.listFiles((dir, name) -> name.endsWith(".js"));
if (files != null) {
for (File file : files) {
loadScript(file);
}
}
}
public void loadScript(File file) {
String fileName = file.getName();
unloadScript(fileName); // Ensure clean slate if reloading
System.out.println("[JStom] Loading script: " + fileName);
ScriptApi api = new ScriptApi();
Context context = Context.newBuilder("js")
.allowHostAccess(HostAccess.ALL)
.allowHostClassLookup(s -> true)
.allowIO(true)
.build();
context.getBindings("js").putMember("server", api);
try {
context.eval(Source.newBuilder("js", file).build());
loadedScripts.put(fileName, new ScriptEnv(context, api, file));
} catch (IOException e) {
e.printStackTrace();
} catch (Exception e) {
System.err.println("[JStom] Error executing script " + fileName);
e.printStackTrace();
// Cleanup if failed
api.cleanup();
context.close();
}
}
public void unloadScript(String fileName) {
ScriptEnv env = loadedScripts.remove(fileName);
if (env != null) {
env.api.cleanup();
env.context.close();
System.out.println("[JStom] Unloaded script: " + fileName);
}
}
public void unload() {
// Copy keys to avoid ConcurrentModificationException
for (String fileName : new java.util.ArrayList<>(loadedScripts.keySet())) {
unloadScript(fileName);
}
}
public void reload() {
unload();
load();
}
public void reload(String fileName) {
File file = new File(scriptsDir, fileName);
if (file.exists()) {
loadScript(file);
} else {
System.err.println("[JStom] File not found: " + fileName);
}
}
private static class ScriptEnv {
final Context context;
final ScriptApi api;
final File file;
public ScriptEnv(Context context, ScriptApi api, File file) {
this.context = context;
this.api = api;
this.file = file;
}
}
}