migrated to Gradle and Minestom 2026.10.05-26.2

- Maven -> Gradle 9.6.1 (shadow 9.6.1, Java 25), shadow jar is build/libs/limbo.jar
- Minestom from Maven Central (net.minestom:minestom), speaks Minecraft 26.2 natively
- Velocity forwarding via Auth.Velocity; the secret is no longer hardcoded but read from
  forwarding.secret in the working directory or VELOCITY_FORWARDING_SECRET
- time rate via defaultClock().pause() (new clock API)
- slf4j-simple for logging (Minestom no longer ships a logger)
- removed target/ and Maven files from the repository
- uploadLimbo task copies the jar to the limbo server

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

.gitignore

@@ -0,0 +1,6 @@
+.gradle/
+build/
+target/
+*.iml
+.idea/workspace.xml
+forwarding.secret

EndlessJumper.iml

@@ -1,13 +0,0 @@
-<?xml version="1.0" encoding="UTF-8"?>
-<module version="4">
-  <component name="FacetManager">
-    <facet type="minecraft" name="Minecraft">
-      <configuration>
-        <autoDetectTypes>
-          <platformType>MIXIN</platformType>
-          <platformType>ADVENTURE</platformType>
-        </autoDetectTypes>
-      </configuration>
-    </facet>
-  </component>
-</module>

build.gradle

@@ -0,0 +1,40 @@
+plugins {
+    id 'java'
+    id 'application'
+    id 'com.gradleup.shadow' version '9.6.1'
+}
+
+group = 'eu.mhsl.minecraft'
+version = '1.0-SNAPSHOT'
+
+repositories {
+    mavenCentral()
+}
+
+dependencies {
+    implementation 'net.minestom:minestom:2026.10.05-26.2'
+    runtimeOnly 'org.slf4j:slf4j-simple:2.0.20'
+}
+
+java {
+    toolchain.languageVersion = JavaLanguageVersion.of(25)
+}
+
+application {
+    mainClass = 'eu.mhsl.minecraft.endlessjumper.EndlessJumper'
+}
+
+shadowJar {
+    archiveFileName = 'limbo.jar'
+    mergeServiceFiles()
+}
+
+// Hochladen auf den Limbo: ./gradlew uploadLimbo, danach `sudo systemctl restart limbo`
+tasks.register('uploadLimbo') {
+    dependsOn shadowJar
+    doLast {
+        providers.exec {
+            commandLine 'scp', shadowJar.archiveFile.get().asFile.absolutePath, 'minecraft@10.20.9.3:/home/minecraft/limbo/limbo.jar'
+        }.result.get()
+    }
+}

build.sh

@@ -1,2 +1 @@
-mvn -f pom.xml clean package
+./gradlew shadowJar
-

dependency-reduced-pom.xml

@@ -1,44 +0,0 @@
-<?xml version="1.0" encoding="UTF-8"?>
-<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd">
-  <modelVersion>4.0.0</modelVersion>
-  <groupId>org.example</groupId>
-  <artifactId>EndlessJumper</artifactId>
-  <version>1.0-SNAPSHOT</version>
-  <build>
-    <plugins>
-      <plugin>
-        <artifactId>maven-shade-plugin</artifactId>
-        <version>3.5.3</version>
-        <executions>
-          <execution>
-            <phase>package</phase>
-            <goals>
-              <goal>shade</goal>
-            </goals>
-            <configuration>
-              <transformers>
-                <transformer>
-                  <mainClass>eu.mhsl.minecraft.endlessjumper.EndlessJumper</mainClass>
-                </transformer>
-              </transformers>
-            </configuration>
-          </execution>
-        </executions>
-      </plugin>
-    </plugins>
-  </build>
-  <repositories>
-    <repository>
-      <id>spongepowered</id>
-      <url>https://repo.spongepowered.org/maven</url>
-    </repository>
-    <repository>
-      <id>jitpack</id>
-      <url>https://jitpack.io</url>
-    </repository>
-  </repositories>
-  <properties>
-    <maven.compiler.target>17</maven.compiler.target>
-    <maven.compiler.source>17</maven.compiler.source>
-  </properties>
-</project>

gradle/wrapper/gradle-wrapper.properties

@@ -0,0 +1,7 @@
+distributionBase=GRADLE_USER_HOME
+distributionPath=wrapper/dists
+distributionUrl=https\://services.gradle.org/distributions/gradle-9.6.1-bin.zip
+networkTimeout=10000
+validateDistributionUrl=true
+zipStoreBase=GRADLE_USER_HOME
+zipStorePath=wrapper/dists

gradlew

@@ -0,0 +1,249 @@
+#!/bin/sh
+
+#
+# Copyright © 2015-2021 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.
+#
+
+##############################################################################
+#
+#   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/subprojects/plugins/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 "${APP_HOME:-./}" > /dev/null && pwd -P ) || exit
+
+# Use the maximum available, or set MAX_FD != -1 to use that value.
+MAX_FD=maximum
+
+warn () {
+    echo "$*"
+} >&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=$APP_HOME/gradle/wrapper/gradle-wrapper.jar
+
+
+# Determine the Java command to use to start the JVM.
+if [ -n "$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, 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" \
+        org.gradle.wrapper.GradleWrapperMain \
+        "$@"
+
+# Stop when "xargs" is not available.
+if ! command -v xargs >/dev/null 2>&1
+then
+    die "xargs is not available"
+fi
+
+# Use "xargs" to parse quoted args.
+#
+# With -n1 it outputs one arg per line, with the quotes and backslashes removed.
+#
+# In Bash we could simply go:
+#
+#   readarray ARGS < <( xargs -n1 <<<"$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 "$JAVACMD" "$@"

gradlew.bat

@@ -0,0 +1,92 @@
+@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
+
+@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.
+echo ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH.
+echo.
+echo Please set the JAVA_HOME variable in your environment to match the
+echo location of your Java installation.
+
+goto fail
+
+:findJavaFromJavaHome
+set JAVA_HOME=%JAVA_HOME:"=%
+set JAVA_EXE=%JAVA_HOME%/bin/java.exe
+
+if exist "%JAVA_EXE%" goto execute
+
+echo.
+echo ERROR: JAVA_HOME is set to an invalid directory: %JAVA_HOME%
+echo.
+echo Please set the JAVA_HOME variable in your environment to match the
+echo location of your Java installation.
+
+goto fail
+
+:execute
+@rem Setup the command line
+
+set CLASSPATH=%APP_HOME%\gradle\wrapper\gradle-wrapper.jar
+
+
+@rem Execute Gradle
+"%JAVA_EXE%" %DEFAULT_JVM_OPTS% %JAVA_OPTS% %GRADLE_OPTS% "-Dorg.gradle.appname=%APP_BASE_NAME%" -classpath "%CLASSPATH%" org.gradle.wrapper.GradleWrapperMain %*
+
+: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

pom.xml

@@ -1,59 +0,0 @@
-<?xml version="1.0" encoding="UTF-8"?>
-<project xmlns="http://maven.apache.org/POM/4.0.0"
-         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
-         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
-    <modelVersion>4.0.0</modelVersion>
-
-    <groupId>org.example</groupId>
-    <artifactId>EndlessJumper</artifactId>
-    <version>1.0-SNAPSHOT</version>
-
-    <properties>
-        <maven.compiler.source>17</maven.compiler.source>
-        <maven.compiler.target>17</maven.compiler.target>
-    </properties>
-
-    <repositories>
-        <repository>
-            <id>spongepowered</id>
-            <url>https://repo.spongepowered.org/maven</url>
-        </repository>
-        <repository>
-            <id>jitpack</id>
-            <url>https://jitpack.io</url>
-        </repository>
-    </repositories>
-
-    <dependencies>
-        <dependency>
-            <groupId>net.minestom</groupId>
-            <artifactId>minestom-snapshots</artifactId>
-            <version>d707b0674f</version>
-        </dependency>
-    </dependencies>
-
-    <build>
-        <plugins>
-            <plugin>
-                <groupId>org.apache.maven.plugins</groupId>
-                <artifactId>maven-shade-plugin</artifactId>
-                <version>3.5.3</version>
-                <executions>
-                    <execution>
-                        <phase>package</phase>
-                        <goals>
-                            <goal>shade</goal>
-                        </goals>
-                        <configuration>
-                            <transformers>
-                                <transformer implementation="org.apache.maven.plugins.shade.resource.ManifestResourceTransformer">
-                                    <mainClass>eu.mhsl.minecraft.endlessjumper.EndlessJumper</mainClass>
-                                </transformer>
-                            </transformers>
-                        </configuration>
-                    </execution>
-                </executions>
-            </plugin>
-        </plugins>
-    </build>
-</project>

settings.gradle

@@ -0,0 +1 @@
+rootProject.name = 'EndlessJumper'

src/main/java/eu/mhsl/minecraft/endlessjumper/EndlessJumper.java

@@ -1,6 +1,7 @@
 package eu.mhsl.minecraft.endlessjumper;
 
 import eu.mhsl.minecraft.endlessjumper.generator.JumpGenerator;
+import net.minestom.server.Auth;
 import net.minestom.server.MinecraftServer;
 import net.minestom.server.coordinate.Pos;
 import net.minestom.server.entity.Player;
@@ -10,17 +11,19 @@ import net.minestom.server.event.player.AsyncPlayerConfigurationEvent;
 import net.minestom.server.event.player.PlayerBlockBreakEvent;
 import net.minestom.server.event.player.PlayerDisconnectEvent;
 import net.minestom.server.event.player.PlayerMoveEvent;
-import net.minestom.server.extras.velocity.VelocityProxy;
 import net.minestom.server.instance.InstanceContainer;
 import net.minestom.server.instance.InstanceManager;
 import net.minestom.server.instance.block.Block;
 import net.minestom.server.timer.TaskSchedule;
 
+import java.io.IOException;
+import java.nio.file.Files;
+import java.nio.file.Path;
 import java.util.HashMap;
 
 public class EndlessJumper {
-    public static void main(String[] args) {
+    public static void main(String[] args) throws IOException {
-        MinecraftServer server = MinecraftServer.init();
+        MinecraftServer server = MinecraftServer.init(new Auth.Velocity(readForwardingSecret()));
         InstanceManager instanceManager = MinecraftServer.getInstanceManager();
         GlobalEventHandler eventHandler = MinecraftServer.getGlobalEventHandler();
         PlayerSkin skin = PlayerSkin.fromUsername("Notch");
@@ -37,7 +40,7 @@ public class EndlessJumper {
             Pos startingAt = new Pos(0,100,0);
             world.setBlock(startingAt, Block.DIAMOND_BLOCK);
 
-            world.setTimeRate(0);
+            world.defaultClock().pause();
             world.setTime(18000);
 
             p.setSkin(skin);
@@ -81,8 +84,18 @@ public class EndlessJumper {
 
         eventHandler.addListener(PlayerDisconnectEvent.class, event -> games.remove(event.getPlayer()));
 
-        VelocityProxy.enable("iph0YHK9jNWZ");
         server.start("0.0.0.0", 25501);
 
     }
+
+    // Wie bei Velocity: Secret aus forwarding.secret im Arbeitsverzeichnis, alternativ per Umgebungsvariable
+    private static String readForwardingSecret() throws IOException {
+        String fromEnv = System.getenv("VELOCITY_FORWARDING_SECRET");
+        if(fromEnv != null && !fromEnv.isBlank()) return fromEnv.trim();
+
+        Path file = Path.of("forwarding.secret");
+        if(!Files.exists(file))
+            throw new IllegalStateException("forwarding.secret fehlt im Arbeitsverzeichnis (oder VELOCITY_FORWARDING_SECRET setzen)");
+        return Files.readString(file).trim();
+    }
 }

target/maven-archiver/pom.properties

@@ -1,5 +0,0 @@
-#Generated by Maven
-#Fri Dec 19 20:45:21 CET 2025
-artifactId=EndlessJumper
-groupId=org.example
-version=1.0-SNAPSHOT

target/maven-status/maven-compiler-plugin/compile/default-compile/createdFiles.lst

@@ -1,5 +0,0 @@
-eu/mhsl/minecraft/endlessjumper/generator/BlockPalette.class
-eu/mhsl/minecraft/endlessjumper/TerrainGenerator.class
-eu/mhsl/minecraft/endlessjumper/generator/JumpGenerator.class
-eu/mhsl/minecraft/endlessjumper/BlockMath.class
-eu/mhsl/minecraft/endlessjumper/EndlessJumper.class

target/maven-status/maven-compiler-plugin/compile/default-compile/inputFiles.lst

@@ -1,5 +0,0 @@
-/home/elias/projects/Minecraft/EndlessJumper/src/main/java/eu/mhsl/minecraft/endlessjumper/EndlessJumper.java
-/home/elias/projects/Minecraft/EndlessJumper/src/main/java/eu/mhsl/minecraft/endlessjumper/BlockMath.java
-/home/elias/projects/Minecraft/EndlessJumper/src/main/java/eu/mhsl/minecraft/endlessjumper/TerrainGenerator.java
-/home/elias/projects/Minecraft/EndlessJumper/src/main/java/eu/mhsl/minecraft/endlessjumper/generator/JumpGenerator.java
-/home/elias/projects/Minecraft/EndlessJumper/src/main/java/eu/mhsl/minecraft/endlessjumper/generator/BlockPalette.java