First untested PlayerMove implementation

pom.xml

@@ -49,5 +49,11 @@
             <version>1.15</version>
             <scope>provided</scope>
         </dependency>
+        <dependency>
+            <groupId>steamwar</groupId>
+            <artifactId>SpigotCore</artifactId>
+            <version>2.0</version>
+            <scope>provided</scope>
+        </dependency>
     </dependencies>
 </project>

src/de/steamwar/spectatesystem/Config.java

@@ -1,4 +1,161 @@
 package de.steamwar.spectatesystem;
 
+import org.bukkit.Bukkit;
+import org.bukkit.Location;
+import org.bukkit.World;
+import org.bukkit.configuration.ConfigurationSection;
+import org.bukkit.configuration.file.FileConfiguration;
+import org.bukkit.configuration.file.YamlConfiguration;
+
+import java.io.File;
+import java.util.Collections;
+import java.util.HashSet;
+import java.util.List;
+import java.util.Set;
+import java.util.logging.Level;
+
 public class Config {
+    private Config(){}
+
+    //arena parameter
+    public static final int SchemsizeX;
+    public static final int SchemsizeY;
+    public static final int SchemsizeZ;
+    public static final int TeamBlueCornerX;
+    public static final int TeamBlueCornerY;
+    public static final int TeamBlueCornerZ;
+    private static final int TeamBluePasteX;
+    private static final int TeamBluePasteZ;
+    public static final int TeamRedCornerX;
+    public static final int TeamRedCornerY;
+    public static final int TeamRedCornerZ;
+    private static final int TeamRedPasteX;
+    private static final int TeamRedPasteZ;
+    private static final int TeamBluetoReddistanceX;
+    private static final int TeamBluetoReddistanceY;
+    public static final int TeamBluetoReddistanceZ;
+    public static final Location SpecSpawn;
+    public static final int underArenaBorder;
+    public static final int BorderFromSchematic;
+    public static final int upperArenaBorder;
+    private static final int Schem2BorderX;
+    private static final int Schem2BorderZ;
+    public static final int ArenaMinX;
+    public static final int ArenaMinZ;
+    public static final int ArenaMaxX;
+    public static final int ArenaMaxZ;
+
+    //tech hider parameter
+    public static final boolean TechhiderActive;
+    public static final Set<Integer> HiddenBlocks;
+    public static final Set<String> HiddenBlockTags;
+    public static final Set<String> HiddenBlockEntities;
+    public static final int ObfuscateWith;
+    public static final String ObfuscateWithTag;
+
+    public static final int port = 2222;
+
+    static{
+        World world = Bukkit.getWorlds().get(0);
+        File worldConfigFile = new File(world.getWorldFolder(), "config.yml");
+        if(!worldConfigFile.exists()) {
+            Bukkit.getLogger().log(Level.SEVERE, "Weltconfig fehlt!");
+            Bukkit.shutdown();
+        }
+        FileConfiguration worldconfig = YamlConfiguration.loadConfiguration(worldConfigFile);
+
+        int schemsizeX = worldconfig.getInt("Arena.Schemsize.x");
+        int schemsizeY = worldconfig.getInt("Arena.Schemsize.y");
+        int schemsizeZ = worldconfig.getInt("Arena.Schemsize.z");
+        int teamBlueCornerX = worldconfig.getInt("Arena.TeamBlueCorner.x");
+        int teamBlueCornerY = worldconfig.getInt("Arena.TeamBlueCorner.y");
+        int teamBlueCornerZ = worldconfig.getInt("Arena.TeamBlueCorner.z");
+        TeamBluetoReddistanceX = worldconfig.getInt("Arena.TeamBluetoReddistance.x");
+        TeamBluetoReddistanceY = worldconfig.getInt("Arena.TeamBluetoReddistance.y");
+        TeamBluetoReddistanceZ = worldconfig.getInt("Arena.TeamBluetoReddistance.z");
+        Schem2BorderX = worldconfig.getInt("Arena.Schem2Border.x");
+        Schem2BorderZ = worldconfig.getInt("Arena.Schem2Border.z");
+        underArenaBorder = worldconfig.getInt("Arena.underArenaBorder");
+        BorderFromSchematic = worldconfig.getInt("Arena.BorderFromSchematic");
+
+        if(schemsizeX < 0){
+            SchemsizeX = -schemsizeX;
+            TeamBlueCornerX = teamBlueCornerX - SchemsizeX;
+        }else{
+            SchemsizeX = schemsizeX;
+            TeamBlueCornerX = teamBlueCornerX;
+        }
+        if(schemsizeY < 0){
+            SchemsizeY = -schemsizeY;
+            TeamBlueCornerY = teamBlueCornerY - SchemsizeY;
+        }else{
+            SchemsizeY = schemsizeY;
+            TeamBlueCornerY = teamBlueCornerY;
+        }
+        if(schemsizeZ < 0){
+            SchemsizeZ = -schemsizeZ;
+            TeamBlueCornerZ = teamBlueCornerZ - SchemsizeZ;
+        }else{
+            SchemsizeZ = schemsizeZ;
+            TeamBlueCornerZ = teamBlueCornerZ;
+        }
+
+        upperArenaBorder = TeamBlueCornerY + SchemsizeY + BorderFromSchematic;
+
+        TeamRedCornerX = TeamBluetoReddistanceX + TeamBlueCornerX;
+        TeamRedCornerY = TeamBluetoReddistanceY + TeamBlueCornerY;
+        TeamRedCornerZ = TeamBluetoReddistanceZ + TeamBlueCornerZ;
+
+        TeamBluePasteX = TeamBlueCornerX + SchemsizeX / 2;
+        TeamBluePasteZ = TeamBlueCornerZ + SchemsizeZ / 2;
+        TeamRedPasteX = TeamBluePasteX + TeamBluetoReddistanceX;
+        TeamRedPasteZ = TeamBluePasteZ + TeamBluetoReddistanceZ;
+
+        SpecSpawn = new Location(world,
+                TeamBluePasteX + TeamBluetoReddistanceX/2.0,
+                TeamBlueCornerY + TeamBluetoReddistanceY/2.0 + SchemsizeY/2.0,
+                TeamBluePasteZ + TeamBluetoReddistanceZ/2.0);
+
+        if(TeamBluetoReddistanceX > 0){
+            ArenaMinX = TeamBlueCornerX - Schem2BorderX;
+            ArenaMaxX = TeamRedCornerX + SchemsizeX + Schem2BorderX;
+        }else{
+            ArenaMinX = TeamRedCornerX - Schem2BorderX;
+            ArenaMaxX = TeamBlueCornerX + SchemsizeX + Schem2BorderX;
+        }
+        if(TeamBluetoReddistanceZ > 0){
+            ArenaMinZ = TeamBlueCornerZ - Schem2BorderZ;
+            ArenaMaxZ = TeamRedCornerZ + SchemsizeZ + Schem2BorderZ;
+        }else{
+            ArenaMinZ = TeamRedCornerZ - Schem2BorderZ;
+            ArenaMaxZ = TeamBlueCornerZ + SchemsizeZ + Schem2BorderZ;
+        }
+
+        if(!new File(SpectateSystem.get().getDataFolder(), "config.yml").exists()) {
+            Bukkit.getLogger().log(Level.SEVERE, "Arenaconfig fehlt!");
+            Bukkit.shutdown();
+        }
+        FileConfiguration config = SpectateSystem.get().getConfig();
+
+        ConfigurationSection techhiderConfig = config.getConfigurationSection("Techhider.HiddenBlocks");
+        Set<Integer> blocks = new HashSet<>();
+        Set<String> blockTags = new HashSet<>();
+        for(String key : techhiderConfig.getKeys(false)){
+            blockTags.add(key);
+            if(techhiderConfig.isInt(key))
+                blocks.add(techhiderConfig.getInt(key));
+            else{
+                List<Integer> minmax = techhiderConfig.getIntegerList(key); // Entry 0: Minimum, Entry 1: Maximum
+                for(int i = minmax.get(0); i <= minmax.get(1); i++)
+                    blocks.add(i);
+            }
+
+        }
+        HiddenBlocks = Collections.unmodifiableSet(blocks);
+        HiddenBlockTags = Collections.unmodifiableSet(blockTags);
+        HiddenBlockEntities = Collections.unmodifiableSet(new HashSet<>(config.getStringList("Techhider.HiddenBlockEntities")));
+        ObfuscateWith = config.getInt("Techhider.ObfuscateWith");
+        ObfuscateWithTag = config.getString("Techhider.ObfuscateWithTag");
+        TechhiderActive = config.getBoolean("Techhider.Active");
+    }
 }

src/de/steamwar/spectatesystem/ConnectionAcceptor.java

@@ -0,0 +1,35 @@
+package de.steamwar.spectatesystem;
+
+import org.bukkit.Bukkit;
+
+import java.io.IOException;
+import java.net.ServerSocket;
+import java.util.logging.Level;
+
+public class ConnectionAcceptor {
+
+    private final ServerSocket socket;
+
+    public ConnectionAcceptor() throws IOException {
+        socket = new ServerSocket(Config.port);
+        Bukkit.getScheduler().runTaskAsynchronously(SpectateSystem.get(), this::acceptConnections);
+    }
+
+    public void close(){
+        try {
+            socket.close();
+        } catch (IOException e) {
+            Bukkit.getLogger().log(Level.SEVERE, "Could not close socket", e);
+        }
+    }
+
+    private void acceptConnections(){
+        try {
+            while(!socket.isClosed()){
+                new FightserverConnection(socket.accept());
+            }
+        } catch (IOException e) {
+            Bukkit.getLogger().log(Level.WARNING, "Stopping accepting connections", e);
+        }
+    }
+}

src/de/steamwar/spectatesystem/FightServerConnection.java

@@ -1,186 +0,0 @@
-package de.steamwar.spectatesystem;
-
-import org.bukkit.Bukkit;
-
-import java.io.IOException;
-import java.io.InputStream;
-import java.io.OutputStream;
-import java.net.ServerSocket;
-import java.net.Socket;
-
-public class FightServerConnection {
-
-    public static FightServerConnection getInstance() {
-        return fightServerConnection;
-    }
-
-    public static FightServerConnection build(int port) {
-        fightServerConnection = new FightServerConnection(port);
-        return fightServerConnection;
-    }
-
-    public static void cleanUp() {
-        if (fightServerConnection == null) {
-            return;
-        }
-        fightServerConnection.internalCleanUp();
-        fightServerConnection = null;
-    }
-
-    private static FightServerConnection fightServerConnection = null;
-
-    private void internalCleanUp() {
-        internalPreCleanUp();
-        try {
-            serverSocket.close();
-        } catch (IOException e) {
-            errorCode = 2;
-        }
-    }
-
-    private void internalPreCleanUp() {
-        if (socket != null) {
-            try {
-                socket.close();
-            } catch (IOException e) {
-                errorCode = 3;
-            }
-        }
-        if (inputStream != null) {
-            try {
-                inputStream.close();
-            } catch (IOException e) {
-                errorCode = 3;
-            }
-        }
-        if (outputStream != null) {
-            try {
-                outputStream.close();
-            } catch (IOException e) {
-                errorCode = 3;
-            }
-        }
-    }
-
-    /**
-     * 0 - OK
-     * 1 - No Connect
-     * 2 - Error while cleanup
-     * 3 - Error while pre cleanup
-     * 4 - Error while writing
-     * 5 - Error while reading
-     * 6 - Error while flushing
-     */
-    private int errorCode = 0;
-
-    private ServerSocket serverSocket;
-    private Socket socket = null;
-    private InputStream inputStream = null;
-    private OutputStream outputStream = null;
-
-    private FightServerConnection(int port) {
-        try {
-            this.serverSocket = new ServerSocket(port);
-            Bukkit.getScheduler().runTaskAsynchronously(SpectateSystem.get(), () -> {
-                while (serverSocket != null) {
-                    while (socket == null) {
-                        try {
-                            socket = serverSocket.accept();
-                        } catch (IOException e) {
-
-                        }
-                    }
-                    try {
-                        inputStream = socket.getInputStream();
-                        outputStream = socket.getOutputStream();
-                    } catch (IOException e) {
-                        socket = null;
-                    }
-                    if (socket == null) continue;
-                    while (true) {
-                        try {
-                            outputStream.write(0);
-                        } catch (IOException e) {
-                            break;
-                        }
-                    }
-                    internalPreCleanUp();
-                    socket = null;
-                    inputStream = null;
-                    outputStream = null;
-                }
-            });
-        } catch (IOException e) {
-            errorCode = 1;
-        }
-    }
-
-    public int getErrorCode() {
-        return errorCode;
-    }
-
-    public InputStream getInputStream() {
-        return inputStream;
-    }
-
-    public OutputStream getOutputStream() {
-        return outputStream;
-    }
-
-    public int read() {
-        try {
-            return inputStream.read();
-        } catch (IOException e) {
-            errorCode = 5;
-            return -2;
-        }
-    }
-
-    public byte[] lazyRead(int length) {
-        try {
-            byte[] bytes = new byte[length];
-            inputStream.read(bytes);
-            return bytes;
-        } catch (IOException e) {
-            errorCode = 5;
-            return new byte[length];
-        }
-    }
-
-    public byte[] read(int length) {
-        byte[] bytes = new byte[length];
-        for (int i = 0; i < length; i++) {
-            bytes[i] = (byte) read();
-            if (errorCode != 0) {
-                break;
-            }
-        }
-        return bytes;
-    }
-
-    public void write(byte b) {
-        try {
-            outputStream.write(b);
-        } catch (IOException e) {
-            errorCode = 4;
-        }
-    }
-
-    public void write(byte... bytes) {
-        try {
-            outputStream.write(bytes);
-        } catch (IOException e) {
-            errorCode = 4;
-        }
-        flush();
-    }
-
-    public void flush() {
-        try {
-            outputStream.flush();
-        } catch (IOException e) {
-            errorCode = 6;
-        }
-    }
-
-}

src/de/steamwar/spectatesystem/FightserverConnection.java

@@ -0,0 +1,69 @@
+package de.steamwar.spectatesystem;
+
+import org.bukkit.Bukkit;
+
+import java.io.DataInputStream;
+import java.io.IOException;
+import java.net.Socket;
+import java.util.logging.Level;
+
+public class FightserverConnection implements PacketSource {
+    private final Socket socket;
+    private final DataInputStream inputStream;
+
+    FightserverConnection(Socket socket) throws IOException{
+        this.socket = socket;
+        this.inputStream = new DataInputStream(socket.getInputStream());
+        new PacketProcessor(this);
+    }
+
+    @Override
+    public byte rByte() throws IOException {
+        return inputStream.readByte();
+    }
+
+    @Override
+    public short rShort() throws IOException {
+        return inputStream.readShort();
+    }
+
+    @Override
+    public int rInt() throws IOException {
+        return inputStream.readInt();
+    }
+
+    @Override
+    public long rLong() throws IOException {
+        return inputStream.readLong();
+    }
+
+    @Override
+    public float rFloat() throws IOException {
+        return inputStream.readFloat();
+    }
+
+    @Override
+    public double rDouble() throws IOException {
+        return inputStream.readDouble();
+    }
+
+    @Override
+    public String rString() throws IOException {
+        return inputStream.readUTF();
+    }
+
+    @Override
+    public void close() {
+        try {
+            socket.close();
+            inputStream.close();
+        } catch (IOException e) {
+            Bukkit.getLogger().log(Level.SEVERE, "IOException on close", e);
+        }
+    }
+
+    @Override
+    public boolean isClosed() {
+        return socket.isClosed();
+    }
+}

src/de/steamwar/spectatesystem/PacketProcessor.java

@@ -0,0 +1,70 @@
+package de.steamwar.spectatesystem;
+
+import de.steamwar.spectatesystem.elements.REntity;
+import de.steamwar.spectatesystem.elements.RPlayer;
+import de.steamwar.sql.SteamwarUser;
+import org.bukkit.Bukkit;
+
+import java.io.IOException;
+import java.util.logging.Level;
+
+class PacketProcessor {
+
+    private final PacketSource source;
+
+    public PacketProcessor(PacketSource source){
+        this.source = source;
+        Bukkit.getScheduler().runTaskAsynchronously(SpectateSystem.get(), this::process);
+    }
+
+    private void playerJoins() throws IOException{
+        int entityId = source.rInt();
+        int userId = source.rInt();
+        SteamwarUser user = SteamwarUser.get(userId);
+        if(user == null)
+            throw new IOException("Unknown user " + userId);
+
+        new RPlayer(user.getUUID(), user.getUserName(), entityId);
+    }
+
+    private void entityMoves() throws IOException{
+        int entityId = source.rInt();
+        double locX = source.rDouble();
+        double locY = source.rDouble();
+        double locZ = source.rDouble();
+        float pitch = source.rFloat();
+        float yaw = source.rFloat();
+
+        REntity.getEntity(entityId).move(locX, locY, locZ, yaw, pitch);
+    }
+
+    private void entityDespawns() throws IOException{
+        int entityId = source.rInt();
+
+        REntity.getEntity(entityId).remove();
+    }
+
+    private void process(){
+        try{
+            while(!source.isClosed()){
+                switch(source.rByte()){
+                    case 0x00:
+                        playerJoins();
+                        break;
+                    case 0x01:
+                        entityMoves();
+                        break;
+                    case 0x02:
+                        entityDespawns();
+                        break;
+                    default:
+                        Bukkit.getLogger().log(Level.SEVERE, "Unknown packet recieved, closing");
+                        source.close();
+                }
+            }
+        }catch(IOException e){
+            Bukkit.getLogger().log(Level.WARNING, "Could not recieve packet", e);
+            source.close();
+        }
+    }
+}

src/de/steamwar/spectatesystem/PacketSource.java

@@ -0,0 +1,17 @@
+package de.steamwar.spectatesystem;
+
+import java.io.IOException;
+
+public interface PacketSource {
+
+    byte rByte() throws IOException;
+    short rShort() throws IOException;
+    int rInt() throws IOException;
+    long rLong() throws IOException;
+    float rFloat() throws IOException;
+    double rDouble() throws IOException;
+    String rString() throws IOException;
+
+    void close();
+    boolean isClosed();
+}

src/de/steamwar/spectatesystem/Region.java

@@ -0,0 +1,36 @@
+package de.steamwar.spectatesystem;
+
+import org.bukkit.Location;
+
+public class Region {
+
+    private Region(){}
+
+    public static boolean isInRange(Location location, int minX, int minY, int minZ, int xRange, int yRange, int zRange, int margin) {
+        return isInRegion(location, minX, minY, minZ, minX + xRange, minY + yRange, minZ + zRange, margin);
+    }
+
+    public static boolean isInRegion(Location location, int minX, int minY, int minZ, int maxX, int maxY, int maxZ, int margin) {
+        return isIn2DRegion(location, minX, minZ, maxX, maxZ, margin) && inRange(location.getBlockY(), minY, maxY, margin);
+    }
+
+    public static boolean isIn2DRange(Location location, int minX, int minZ, int xRange, int zRange, int margin){
+        return isIn2DRegion(location, minX, minZ, minX + xRange, minZ + zRange, margin);
+    }
+
+    private static boolean isIn2DRegion(Location location, int minX, int minZ, int maxX, int maxZ, int margin){
+        return inRange(location.getBlockX(), minX, maxX, margin) && inRange(location.getBlockZ(), minZ, maxZ, margin);
+    }
+
+    public static boolean isIn2DRegion(Location location, int minX, int minZ, int maxX, int maxZ){
+        return inRange(location.getBlockX(), minX, maxX) && inRange(location.getBlockZ(), minZ, maxZ);
+    }
+
+    private static boolean inRange(double value, int min, int max, int margin){
+        return inRange(value, min-margin, max+margin);
+    }
+
+    private static boolean inRange(double value, int min, int max){
+        return min <= value && value <= max;
+    }
+}

src/de/steamwar/spectatesystem/SpectateSystem.java

@@ -1,21 +1,33 @@
 package de.steamwar.spectatesystem;
 
+import de.steamwar.spectatesystem.listener.ArenaListener;
 import de.steamwar.spectatesystem.listener.JoinListener;
+import org.bukkit.Bukkit;
 import org.bukkit.plugin.java.JavaPlugin;
 
+import java.io.IOException;
+import java.util.logging.Level;
+
 public class SpectateSystem extends JavaPlugin {
 
     private static SpectateSystem instance;
+    private ConnectionAcceptor acceptor;
 
     @Override
     public void onEnable() {
         instance = this;
         new JoinListener();
+        new ArenaListener();
+        try {
+            acceptor = new ConnectionAcceptor();
+        } catch (IOException e) {
+            Bukkit.getLogger().log(Level.SEVERE, "Could not open ConnectionAcceptor", e);
+        }
     }
 
     @Override
     public void onDisable() {
-
+        acceptor.close();
     }
 
     public static SpectateSystem get(){

src/de/steamwar/spectatesystem/elements/RBlockchange.java

@@ -1,5 +1,6 @@
 package de.steamwar.spectatesystem.elements;
 
+import de.steamwar.spectatesystem.Config;
 import net.minecraft.server.v1_15_R1.Block;
 import net.minecraft.server.v1_15_R1.BlockPosition;
 import net.minecraft.server.v1_15_R1.IBlockData;
@@ -12,6 +13,8 @@ public class RBlockchange {
     private static final WorldServer WORLD = ((CraftWorld) Bukkit.getWorlds().get(0)).getHandle();
 
     public RBlockchange(int x, int y, int z, int stateId){
+        if(Config.TechhiderActive && Config.HiddenBlocks.contains(stateId))
+            stateId = Config.ObfuscateWith;
         IBlockData blockData = Block.REGISTRY_ID.fromId(stateId);
         BlockPosition pos = new BlockPosition(x, y, z);
         WORLD.setTypeAndData(pos, blockData, 1042);

src/de/steamwar/spectatesystem/elements/RChatmessage.java

@@ -0,0 +1,8 @@
+package de.steamwar.spectatesystem.elements;
+
+public class RChatmessage {
+
+    public RChatmessage(){
+
+    }
+}

src/de/steamwar/spectatesystem/elements/RPlayer.java

@@ -21,6 +21,9 @@ public class RPlayer extends REntity {
 
     public RPlayer(UUID uuid, String name, int internalId){
         super(internalId, createPlayer(uuid, name));
+        //TODO Item in Hand
+        //TODO Armor
+        //TODO Damage
     }
 
     @Override

src/de/steamwar/spectatesystem/listener/ArenaListener.java

@@ -0,0 +1,52 @@
+package de.steamwar.spectatesystem.listener;
+
+import de.steamwar.spectatesystem.Config;
+import de.steamwar.spectatesystem.Region;
+import de.steamwar.spectatesystem.SpectateSystem;
+import net.md_5.bungee.api.ChatMessageType;
+import net.md_5.bungee.api.chat.TextComponent;
+import org.bukkit.Bukkit;
+import org.bukkit.Location;
+import org.bukkit.entity.Player;
+import org.bukkit.event.EventHandler;
+import org.bukkit.event.player.PlayerMoveEvent;
+import org.bukkit.event.player.PlayerTeleportEvent;
+
+public class ArenaListener extends BasicListener {
+
+    private static final String DENY_ARENA = "§cDu darfst die Arena nicht verlassen";
+    private static final String DENY_TEAM = "§cDu darfst nicht zu den Teams";
+
+    @EventHandler
+    public void onMove(PlayerMoveEvent event) {
+        Location to = event.getTo();
+
+        assert to != null;
+        if(!Region.isIn2DRegion(to, Config.ArenaMinX, Config.ArenaMinZ, Config.ArenaMaxX, Config.ArenaMaxZ) || to.getY() <= Config.underArenaBorder) {
+            reset(event, DENY_ARENA);
+            return;
+        }
+
+        boolean inArenaY = to.getY() + 1.8 <= Config.upperArenaBorder;
+        boolean inBlueArea = inArenaY && Region.isIn2DRange(to, Config.TeamBlueCornerX, Config.TeamBlueCornerZ, Config.SchemsizeX, Config.SchemsizeZ, Config.BorderFromSchematic);
+        boolean inRedArea  = inArenaY && Region.isIn2DRange(to, Config.TeamRedCornerX, Config.TeamRedCornerZ, Config.SchemsizeX, Config.SchemsizeZ, Config.BorderFromSchematic);
+
+        if(inBlueArea || inRedArea)
+            reset(event, DENY_TEAM);
+    }
+
+    private void reset(PlayerMoveEvent event, String message){
+        Player player = event.getPlayer();
+        player.teleport(event.getFrom());
+        player.spigot().sendMessage(ChatMessageType.ACTION_BAR, TextComponent.fromLegacyText(message));
+    }
+
+    @EventHandler
+    public void onTpGM3(PlayerTeleportEvent e) {
+        if (e.getCause() == PlayerTeleportEvent.TeleportCause.SPECTATE) {
+            e.setCancelled(true);
+            e.getPlayer().spigot().sendMessage(ChatMessageType.ACTION_BAR, TextComponent.fromLegacyText("§cDu darfst diese Teleportfunktion nicht benutzen!"));
+            Bukkit.getScheduler().runTaskLater(SpectateSystem.get(), () -> e.getPlayer().teleport(e.getFrom()), 2);
+        }
+    }
+}

src/de/steamwar/spectatesystem/listener/BasicListener.java

@@ -0,0 +1,12 @@
+package de.steamwar.spectatesystem.listener;
+
+import de.steamwar.spectatesystem.SpectateSystem;
+import org.bukkit.Bukkit;
+import org.bukkit.event.Listener;
+
+abstract class BasicListener implements Listener {
+
+    BasicListener(){
+        Bukkit.getPluginManager().registerEvents(this, SpectateSystem.get());
+    }
+}

src/de/steamwar/spectatesystem/listener/JoinListener.java

@@ -1,20 +1,15 @@
 package de.steamwar.spectatesystem.listener;
 
-import de.steamwar.spectatesystem.SpectateSystem;
 import de.steamwar.spectatesystem.elements.REntity;
-import org.bukkit.Bukkit;
+import org.bukkit.entity.Player;
 import org.bukkit.event.EventHandler;
-import org.bukkit.event.Listener;
 import org.bukkit.event.player.PlayerJoinEvent;
 
-public class JoinListener implements Listener {
-
-    public JoinListener(){
-        Bukkit.getPluginManager().registerEvents(this, SpectateSystem.get());
-    }
+public class JoinListener extends BasicListener {
 
     @EventHandler
     public void onJoin(PlayerJoinEvent e){
-        REntity.playerJoins(e.getPlayer());
+        Player player = e.getPlayer();
+        REntity.playerJoins(player);
     }
 }

src/plugin.yml

@@ -2,4 +2,6 @@ authors:
   - Lixfel
 name: SpectateSystem
 version: 1.0
-main: de.steamwar.spectatesystem.SpectateSystem
+main: de.steamwar.spectatesystem.SpectateSystem
+depends:
+  - SpigotCore