1.9 support

HolographicDisplays/Plugin/com/gmail/filoghost/holographicdisplays/HolographicDisplays.java

@@ -7,7 +7,6 @@ import org.bukkit.plugin.java.JavaPlugin;
 
 import com.gmail.filoghost.holographicdisplays.SimpleUpdater.ResponseHandler;
 import com.gmail.filoghost.holographicdisplays.bridge.bungeecord.BungeeServerTracker;
-import com.gmail.filoghost.holographicdisplays.bridge.protocollib.ProtocolLibHook;
 import com.gmail.filoghost.holographicdisplays.commands.main.HologramsCommandHandler;
 import com.gmail.filoghost.holographicdisplays.disk.Configuration;
 import com.gmail.filoghost.holographicdisplays.disk.HologramDatabase;
@@ -39,7 +38,10 @@ public class HolographicDisplays extends JavaPlugin {
 	private HologramsCommandHandler commandHandler;
 	
 	// Since 1.8 we use armor stands instead of wither skulls.
-	private static boolean is1_8;
+	private static boolean is18orGreater;
+	
+	// Since 1.9 there is a different offset for the nametag.
+	private static boolean is19orGreater;
 	
 	// Used for the server pinger.
 	private static boolean isPreNetty;
@@ -120,20 +122,24 @@ public class HolographicDisplays extends JavaPlugin {
 		} else if ("v1_7_R4".equals(version)) {
 			nmsManager = new com.gmail.filoghost.holographicdisplays.nms.v1_7_R4.NmsManagerImpl();
 		} else if ("v1_8_R1".equals(version)) {
-			is1_8 = true;
+			is18orGreater = true;
 			nmsManager = new com.gmail.filoghost.holographicdisplays.nms.v1_8_R1.NmsManagerImpl();
 		} else if ("v1_8_R2".equals(version)) {
-			is1_8 = true;
+			is18orGreater = true;
 			nmsManager = new com.gmail.filoghost.holographicdisplays.nms.v1_8_R2.NmsManagerImpl();
 		} else if ("v1_8_R3".equals(version)) {
-			is1_8 = true;
+			is18orGreater = true;
 			nmsManager = new com.gmail.filoghost.holographicdisplays.nms.v1_8_R3.NmsManagerImpl();
+		} else if ("v1_9_R1".equals(version)) {
+			is18orGreater = true;
+			is19orGreater = true;
+			nmsManager = new com.gmail.filoghost.holographicdisplays.nms.v1_9_R1.NmsManagerImpl();
 		} else {
 			printWarnAndDisable(
 				"******************************************************",
 				"     This version of HolographicDisplays can",
 				"     only work on these server versions:",
-				"     from 1.6.4 to 1.8.8.",
+				"     from 1.6.4 to 1.9.",
 				"     The plugin will be disabled.",
 				"******************************************************"
 			);
@@ -157,7 +163,7 @@ public class HolographicDisplays extends JavaPlugin {
 				"******************************************************",
 				"     HolographicDisplays was unable to register",
 				"     custom entities, the plugin will be disabled.",
-				"     Are you using the correct Bukkit version?",
+				"     Are you using the correct Bukkit/Spigot version?",
 				"******************************************************"
 			);
 			return;
@@ -166,7 +172,11 @@ public class HolographicDisplays extends JavaPlugin {
 		// ProtocolLib check.
 		try {
 			if (Bukkit.getPluginManager().isPluginEnabled("ProtocolLib")) {
-				useProtocolLib = ProtocolLibHook.load(nmsManager, this, is1_8);
+				if (is19orGreater) {
+					useProtocolLib = com.gmail.filoghost.holographicdisplays.bridge.protocollib.current.ProtocolLibHook.load(nmsManager, this);
+				} else {
+					useProtocolLib = com.gmail.filoghost.holographicdisplays.bridge.protocollib.pre1_9.ProtocolLibHook.load(nmsManager, this, is18orGreater);
+				}
 			}
 		} catch (Exception ex) {
 			ex.printStackTrace();
@@ -214,8 +224,8 @@ public class HolographicDisplays extends JavaPlugin {
 				"******************************************************",
 				"     HolographicDisplays was unable to register",
 				"     the command \"holograms\". Do not modify",
-				"     plugin.yml removing commands, if you're",
+				"     plugin.yml removing commands, if this is",
-				"     doing so.",
+				"     the case.",
 				"******************************************************"
 			);
 			return;
@@ -249,8 +259,12 @@ public class HolographicDisplays extends JavaPlugin {
 		return commandHandler;
 	}
 
-	public static boolean is1_8() {
+	public static boolean is18orGreater() {
-		return is1_8;
+		return is18orGreater;
+	}
+	
+	public static boolean is19orGreater() {
+		return is19orGreater;
 	}
 	
 	public static boolean isPreNetty() {

HolographicDisplays/Plugin/com/gmail/filoghost/holographicdisplays/bridge/bungeecord/BungeeChannel.java

@@ -6,6 +6,7 @@ import java.io.DataInputStream;
 import java.io.DataOutputStream;
 import java.io.EOFException;
 import java.io.IOException;
+import java.util.Collection;
 
 import org.bukkit.Bukkit;
 import org.bukkit.entity.Player;
@@ -14,6 +15,7 @@ import org.bukkit.plugin.messaging.PluginMessageListener;
 
 import com.gmail.filoghost.holographicdisplays.HolographicDisplays;
 import com.gmail.filoghost.holographicdisplays.disk.Configuration;
+import com.gmail.filoghost.holographicdisplays.util.VersionUtils;
 
 public class BungeeChannel implements PluginMessageListener {
 
@@ -80,7 +82,7 @@ public class BungeeChannel implements PluginMessageListener {
 		}
 	}
 	
-	@SuppressWarnings("deprecation")
+	
 	public void askPlayerCount(String server) {
 		ByteArrayOutputStream b = new ByteArrayOutputStream();
 		DataOutputStream out = new DataOutputStream(b);
@@ -95,9 +97,9 @@ public class BungeeChannel implements PluginMessageListener {
 		}
 
 		// OR, if you don't need to send it to a specific player
-		Player[] players = Bukkit.getOnlinePlayers();
+		Collection<? extends Player> players = VersionUtils.getOnlinePlayers();
-		if (players.length > 0) {
+		if (players.size() > 0) {
-			players[0].sendPluginMessage(HolographicDisplays.getInstance(), Configuration.useRedisBungee ? "RedisBungee" : "BungeeCord", b.toByteArray());
+			players.iterator().next().sendPluginMessage(HolographicDisplays.getInstance(), Configuration.useRedisBungee ? "RedisBungee" : "BungeeCord", b.toByteArray());
 		}
 	}
 }

HolographicDisplays/Plugin/com/gmail/filoghost/holographicdisplays/bridge/protocollib/current/AbstractPacket.java

@@ -0,0 +1,82 @@
+/*
+ *  PacketWrapper - Contains wrappers for each packet in Minecraft.
+ *  Copyright (C) 2012 Kristian S. Stangeland
+ *
+ *  This program is free software; you can redistribute it and/or modify it under the terms of the 
+ *  GNU Lesser General Public License as published by the Free Software Foundation; either version 2 of 
+ *  the License, or (at your option) any later version.
+ *
+ *  This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; 
+ *  without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. 
+ *  See the GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License along with this program; 
+ *  if not, write to the Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 
+ *  02111-1307 USA
+ */
+
+package com.gmail.filoghost.holographicdisplays.bridge.protocollib.current;
+
+import java.lang.reflect.InvocationTargetException;
+
+import org.bukkit.entity.Player;
+
+import com.comphenix.protocol.PacketType;
+import com.comphenix.protocol.ProtocolLibrary;
+import com.comphenix.protocol.events.PacketContainer;
+import com.google.common.base.Objects;
+
+public abstract class AbstractPacket {
+	// The packet we will be modifying
+	protected PacketContainer handle;
+
+	/**
+	 * Constructs a new strongly typed wrapper for the given packet.
+	 * @param handle - handle to the raw packet data.
+	 * @param type - the packet type.
+	 */
+	protected AbstractPacket(PacketContainer handle, PacketType type) {
+		// Make sure we're given a valid packet
+		if (handle == null)
+			throw new IllegalArgumentException("Packet handle cannot be NULL.");
+		if (!Objects.equal(handle.getType(), type))
+			throw new IllegalArgumentException(
+					handle.getHandle() + " is not a packet of type " + type);
+
+		this.handle = handle;
+	}
+
+	/**
+	 * Retrieve a handle to the raw packet data.
+	 * @return Raw packet data.
+	 */
+	public PacketContainer getHandle() {
+		return handle;
+	}
+
+	/**
+	 * Send the current packet to the given receiver.
+	 * @param receiver - the receiver.
+	 * @throws RuntimeException If the packet cannot be sent.
+	 */
+	public void sendPacket(Player receiver) {
+		try {
+			ProtocolLibrary.getProtocolManager().sendServerPacket(receiver, getHandle());
+		} catch (InvocationTargetException e) {
+			throw new RuntimeException("Cannot send packet.", e);
+		}
+	}
+
+	/**
+	 * Simulate receiving the current packet from the given sender.
+	 * @param sender - the sender.
+	 * @throws RuntimeException If the packet cannot be received.
+	 */
+	public void recievePacket(Player sender) {
+		try {
+			ProtocolLibrary.getProtocolManager().recieveClientPacket(sender, getHandle());
+		} catch (Exception e) {
+			throw new RuntimeException("Cannot recieve packet.", e);
+		}
+	}
+}

HolographicDisplays/Plugin/com/gmail/filoghost/holographicdisplays/bridge/protocollib/current/ProtocolLibHook.java

@@ -0,0 +1,287 @@
+package com.gmail.filoghost.holographicdisplays.bridge.protocollib.current;
+
+import java.util.List;
+
+import org.bukkit.Bukkit;
+import org.bukkit.ChatColor;
+import org.bukkit.entity.Entity;
+import org.bukkit.entity.EntityType;
+import org.bukkit.entity.Player;
+import org.bukkit.plugin.Plugin;
+
+import com.comphenix.protocol.PacketType;
+import com.comphenix.protocol.ProtocolLibrary;
+import com.comphenix.protocol.events.ListenerPriority;
+import com.comphenix.protocol.events.PacketAdapter;
+import com.comphenix.protocol.events.PacketContainer;
+import com.comphenix.protocol.events.PacketEvent;
+import com.comphenix.protocol.wrappers.WrappedDataWatcher;
+import com.comphenix.protocol.wrappers.WrappedWatchableObject;
+import com.gmail.filoghost.holographicdisplays.bridge.protocollib.current.WrapperPlayServerSpawnEntity.ObjectTypes;
+import com.gmail.filoghost.holographicdisplays.nms.interfaces.NMSManager;
+import com.gmail.filoghost.holographicdisplays.nms.interfaces.entity.NMSEntityBase;
+import com.gmail.filoghost.holographicdisplays.object.CraftHologram;
+import com.gmail.filoghost.holographicdisplays.object.line.CraftHologramLine;
+import com.gmail.filoghost.holographicdisplays.object.line.CraftItemLine;
+import com.gmail.filoghost.holographicdisplays.object.line.CraftTextLine;
+import com.gmail.filoghost.holographicdisplays.object.line.CraftTouchSlimeLine;
+import com.gmail.filoghost.holographicdisplays.object.line.CraftTouchableLine;
+import com.gmail.filoghost.holographicdisplays.util.Utils;
+
+public class ProtocolLibHook {
+	
+	private static boolean hasProtocolLib;
+	private static NMSManager nmsManager;
+	
+	public static boolean load(NMSManager nmsManager, Plugin plugin) {
+		ProtocolLibHook.nmsManager = nmsManager;
+		
+		if (Bukkit.getPluginManager().isPluginEnabled("ProtocolLib")) {
+			
+			//TODO
+			Bukkit.getConsoleSender().sendMessage(
+					ChatColor.RED + "[Holographic Displays] Detected development version of ProtocolLib, support disabled. " +
+					"Related functions (the placeholders {player} {displayname} and the visibility API) will not work.\n" +
+					"The reason is that this version of ProtocolLib is unstable and partly broken. " +
+					"A new version of Holographic Displays will be out when ProtocolLib gets fixed.");
+			return false;
+			
+			/*
+			hasProtocolLib = true;
+						
+			plugin.getLogger().info("Found ProtocolLib, adding support for player relative variables.");
+
+			ProtocolLibrary.getProtocolManager().addPacketListener(new PacketAdapter(plugin, ListenerPriority.NORMAL, PacketType.Play.Server.SPAWN_ENTITY_LIVING, PacketType.Play.Server.SPAWN_ENTITY, PacketType.Play.Server.ENTITY_METADATA) {
+						  
+					@Override
+					public void onPacketSending(PacketEvent event) {
+						
+						PacketContainer packet = event.getPacket();
+
+						// Spawn entity packet
+						if (packet.getType() == PacketType.Play.Server.SPAWN_ENTITY_LIVING) {
+
+							WrapperPlayServerSpawnEntityLiving spawnEntityPacket = new WrapperPlayServerSpawnEntityLiving(packet);
+							Entity entity = spawnEntityPacket.getEntity(event);
+							
+							if (entity == null || !isHologramType(entity.getType())) {
+								return;
+							}
+							
+							CraftHologram hologram = getHologram(entity);
+							if (hologram == null) {
+								return;
+							}
+							
+							Player player = event.getPlayer();
+							if (!hologram.getVisibilityManager().isVisibleTo(player)) {
+								event.setCancelled(true);
+								return;
+							}
+							
+							WrappedDataWatcher dataWatcher = spawnEntityPacket.getMetadata();
+							String customName = dataWatcher.getString(2);
+							
+							if (customName == null) {
+								return;
+							}
+							
+							if (customName.contains("{player}") || customName.contains("{displayname}")) {
+
+								WrappedDataWatcher dataWatcherClone = dataWatcher.deepClone();
+								dataWatcherClone.setObject(2, customName.replace("{player}", player.getName()).replace("{displayname}", player.getDisplayName()));
+								spawnEntityPacket.setMetadata(dataWatcherClone);
+								event.setPacket(spawnEntityPacket.getHandle());
+								
+							}
+
+						} else if (packet.getType() == PacketType.Play.Server.SPAWN_ENTITY) {
+							
+							WrapperPlayServerSpawnEntity spawnEntityPacket = new WrapperPlayServerSpawnEntity(packet);
+							int objectId = spawnEntityPacket.getType();
+							if (objectId != ObjectTypes.ITEM_STACK && objectId != ObjectTypes.ARMOR_STAND) {
+								return;
+							}
+							
+							Entity entity = spawnEntityPacket.getEntity(event);
+							if (entity == null) {
+								return;
+							}
+							
+							CraftHologram hologram = getHologram(entity);
+							if (hologram == null) {
+								return;
+							}
+							
+							Player player = event.getPlayer();
+							if (!hologram.getVisibilityManager().isVisibleTo(player)) {
+								event.setCancelled(true);
+								return;
+							}
+						
+						} else if (packet.getType() == PacketType.Play.Server.ENTITY_METADATA) {
+							
+							WrapperPlayServerEntityMetadata entityMetadataPacket = new WrapperPlayServerEntityMetadata(packet);
+							Entity entity = entityMetadataPacket.getEntity(event);
+							
+							if (entity == null) {
+								return;
+							}
+
+							if (entity.getType() != EntityType.ARMOR_STAND) {
+								// Enough, only armorstands are used with custom names.
+								return;
+							}
+							
+							CraftHologram hologram = getHologram(entity);
+							if (hologram == null) {
+								return;
+							}
+							
+							Player player = event.getPlayer();
+							if (!hologram.getVisibilityManager().isVisibleTo(player)) {
+								event.setCancelled(true);
+								return;
+							}
+
+							List<WrappedWatchableObject> dataWatcherValues = entityMetadataPacket.getEntityMetadata();
+								
+							for (int i = 0; i < dataWatcherValues.size(); i++) {
+								
+								if (dataWatcherValues.get(i).getIndex() == 2 && dataWatcherValues.get(i).getValue() != null) {
+										
+									Object customNameObject = dataWatcherValues.get(i).deepClone().getValue();
+									if (customNameObject == null || customNameObject instanceof String == false) {
+										return;
+									}
+									
+									String customName = (String) customNameObject;
+										
+									if (customName.contains("{player}") || customName.contains("{displayname}")) {
+										
+										entityMetadataPacket = new WrapperPlayServerEntityMetadata(packet.deepClone());
+										List<WrappedWatchableObject> clonedList = entityMetadataPacket.getEntityMetadata();
+										WrappedWatchableObject clonedElement = clonedList.get(i);
+										clonedElement.setValue(customName.replace("{player}", player.getName()).replace("{displayname}", player.getDisplayName()));
+										entityMetadataPacket.setEntityMetadata(clonedList);
+										event.setPacket(entityMetadataPacket.getHandle());
+										return;
+											
+									}
+								}
+							}
+						}
+					}
+				});
+			
+			return true;
+			*/
+		}
+		
+		return false;
+	}
+	
+	public static void sendDestroyEntitiesPacket(Player player, CraftHologram hologram) {
+		if (!hasProtocolLib) {
+			return;
+		}
+		
+		List<Integer> ids = Utils.newList();
+		for (CraftHologramLine line : hologram.getLinesUnsafe()) {
+			if (line.isSpawned()) {
+				for (int id : line.getEntitiesIDs()) {
+					ids.add(id);
+				}
+			}
+		}
+		
+		if (!ids.isEmpty()) {
+			WrapperPlayServerEntityDestroy packet = new WrapperPlayServerEntityDestroy();
+			packet.setEntities(ids);
+			packet.sendPacket(player);
+		}
+	}
+	
+	public static void sendCreateEntitiesPacket(Player player, CraftHologram hologram) {
+		if (!hasProtocolLib) {
+			return;
+		}
+		
+		for (CraftHologramLine line : hologram.getLinesUnsafe()) {
+			if (line.isSpawned()) {
+				
+				if (line instanceof CraftTextLine) {
+					CraftTextLine textLine = (CraftTextLine) line;
+					
+					if (textLine.isSpawned()) {
+						
+						AbstractPacket nameablePacket = new WrapperPlayServerSpawnEntityLiving(textLine.getNmsNameble().getBukkitEntityNMS());
+						nameablePacket.sendPacket(player);
+						
+					}
+					
+				} else if (line instanceof CraftItemLine) {
+					CraftItemLine itemLine = (CraftItemLine) line;
+					
+					if (itemLine.isSpawned()) {
+						AbstractPacket itemPacket = new WrapperPlayServerSpawnEntity(itemLine.getNmsItem().getBukkitEntityNMS(), ObjectTypes.ITEM_STACK, 1);
+						itemPacket.sendPacket(player);
+						
+						AbstractPacket vehiclePacket = new WrapperPlayServerSpawnEntityLiving(itemLine.getNmsVehicle().getBukkitEntityNMS());
+						
+						vehiclePacket.sendPacket(player);
+							
+						WrapperPlayServerMount attachPacket = new WrapperPlayServerMount();
+						attachPacket.setVehicleId(itemLine.getNmsVehicle().getIdNMS());
+						attachPacket.setPassengers(new int[] {itemLine.getNmsItem().getIdNMS()});
+						attachPacket.sendPacket(player);
+						
+						WrapperPlayServerEntityMetadata itemDataPacket = new WrapperPlayServerEntityMetadata();
+						
+						List<WrappedWatchableObject> metadata = Utils.newList();
+						metadata.add(new WrappedWatchableObject(10, itemLine.getItemStack()));
+						metadata.add(new WrappedWatchableObject(1, (short) 300));
+						metadata.add(new WrappedWatchableObject(0, (byte) 0));
+						itemDataPacket.setEntityMetadata(metadata);
+						itemDataPacket.setEntityId(itemLine.getNmsItem().getIdNMS());
+						itemDataPacket.sendPacket(player);
+					}
+				}
+				
+				// Unsafe cast, however both CraftTextLine and CraftItemLine are touchable.
+				CraftTouchableLine touchableLine = (CraftTouchableLine) line;
+				
+				if (touchableLine.isSpawned() && touchableLine.getTouchSlime() != null) {
+						
+					CraftTouchSlimeLine touchSlime = touchableLine.getTouchSlime();
+					
+					if (touchSlime.isSpawned()) {
+						AbstractPacket vehiclePacket = new WrapperPlayServerSpawnEntityLiving(touchSlime.getNmsVehicle().getBukkitEntityNMS());
+						vehiclePacket.sendPacket(player);
+							
+						AbstractPacket slimePacket = new WrapperPlayServerSpawnEntityLiving(touchSlime.getNmsSlime().getBukkitEntityNMS());
+						slimePacket.sendPacket(player);
+							
+						WrapperPlayServerMount attachPacket = new WrapperPlayServerMount();
+						attachPacket.setVehicleId(touchSlime.getNmsVehicle().getIdNMS());
+						attachPacket.setPassengers(new int[] {touchSlime.getNmsSlime().getIdNMS()});
+						attachPacket.sendPacket(player);
+					}
+				}
+			}
+		}
+	}
+
+	private static boolean isHologramType(EntityType type) {
+		return type == EntityType.ARMOR_STAND || type == EntityType.DROPPED_ITEM || type == EntityType.SLIME;
+	}
+	
+	private static CraftHologram getHologram(Entity bukkitEntity) {
+		NMSEntityBase entity = nmsManager.getNMSEntityBase(bukkitEntity);
+		if (entity != null) {
+			return entity.getHologramLine().getParent();
+		}
+		
+		return null;
+	}
+}

HolographicDisplays/Plugin/com/gmail/filoghost/holographicdisplays/bridge/protocollib/current/WrapperPlayServerEntityDestroy.java

@@ -0,0 +1,61 @@
+/*
+ *  PacketWrapper - Contains wrappers for each packet in Minecraft.
+ *  Copyright (C) 2012 Kristian S. Stangeland
+ *
+ *  This program is free software; you can redistribute it and/or modify it under the terms of the
+ *  GNU Lesser General Public License as published by the Free Software Foundation; either version 2 of
+ *  the License, or (at your option) any later version.
+ *
+ *  This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY;
+ *  without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+ *  See the GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License along with this program;
+ *  if not, write to the Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
+ *  02111-1307 USA
+ */
+
+package com.gmail.filoghost.holographicdisplays.bridge.protocollib.current;
+
+import java.util.List;
+
+import com.comphenix.protocol.PacketType;
+import com.comphenix.protocol.events.PacketContainer;
+import com.google.common.primitives.Ints;
+
+public class WrapperPlayServerEntityDestroy extends AbstractPacket {
+    public static final PacketType TYPE = PacketType.Play.Server.ENTITY_DESTROY;
+    
+    public WrapperPlayServerEntityDestroy() {
+        super(new PacketContainer(TYPE), TYPE);
+        handle.getModifier().writeDefaults();
+    }
+    
+    public WrapperPlayServerEntityDestroy(PacketContainer packet) {
+        super(packet, TYPE);
+    }
+    
+    /**
+     * Retrieve the IDs of the entities that will be destroyed.
+     * @return The current entities.
+    */
+    public List<Integer> getEntities() {
+        return Ints.asList(handle.getIntegerArrays().read(0));
+    }
+    
+    /**
+     * Set the entities that will be destroyed.
+     * @param value - new value.
+    */
+    public void setEntities(int[] entities) {
+        handle.getIntegerArrays().write(0, entities);
+    }
+    
+    /**
+     * Set the entities that will be destroyed.
+     * @param value - new value.
+    */
+    public void setEntities(List<Integer> entities) {
+        setEntities(Ints.toArray(entities));
+    }
+}

HolographicDisplays/Plugin/com/gmail/filoghost/holographicdisplays/bridge/protocollib/current/WrapperPlayServerEntityMetadata.java

@@ -0,0 +1,94 @@
+/*
+ *  PacketWrapper - Contains wrappers for each packet in Minecraft.
+ *  Copyright (C) 2012 Kristian S. Stangeland
+ *
+ *  This program is free software; you can redistribute it and/or modify it under the terms of the 
+ *  GNU Lesser General Public License as published by the Free Software Foundation; either version 2 of 
+ *  the License, or (at your option) any later version.
+ *
+ *  This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; 
+ *  without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. 
+ *  See the GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License along with this program; 
+ *  if not, write to the Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 
+ *  02111-1307 USA
+ */
+
+package com.gmail.filoghost.holographicdisplays.bridge.protocollib.current;
+
+import java.util.List;
+
+import org.bukkit.World;
+import org.bukkit.entity.Entity;
+
+import com.comphenix.protocol.PacketType;
+import com.comphenix.protocol.events.PacketContainer;
+import com.comphenix.protocol.events.PacketEvent;
+import com.comphenix.protocol.wrappers.WrappedDataWatcher;
+import com.comphenix.protocol.wrappers.WrappedWatchableObject;
+
+public class WrapperPlayServerEntityMetadata extends AbstractPacket {
+    public static final PacketType TYPE = PacketType.Play.Server.ENTITY_METADATA;
+    
+    public WrapperPlayServerEntityMetadata() {
+        super(new PacketContainer(TYPE), TYPE);
+        handle.getModifier().writeDefaults();
+    }
+    
+    public WrapperPlayServerEntityMetadata(PacketContainer packet) {
+        super(packet, TYPE);
+    }
+    
+    /**
+     * Retrieve unique entity ID to update.
+     * @return The current Entity ID
+    */
+    public int getEntityId() {
+        return handle.getIntegers().read(0);
+    }
+    
+    /**
+     * Set unique entity ID to update.
+     * @param value - new value.
+    */
+    public void setEntityId(int value) {
+        handle.getIntegers().write(0, value);
+    }
+    
+    /**
+     * Retrieve the entity.
+     * @param world - the current world of the entity.
+     * @return The entity.
+     */
+    public Entity getEntity(World world) {
+    	return handle.getEntityModifier(world).read(0);
+    }
+
+    /**
+     * Retrieve the entity.
+     * @param event - the packet event.
+     * @return The entity.
+     */
+    public Entity getEntity(PacketEvent event) {
+    	return getEntity(event.getPlayer().getWorld());
+    }
+    
+    /**
+     * Retrieve a list of all the watchable objects.
+     * <p>
+     * This can be converted to a data watcher using {@link WrappedDataWatcher#WrappedDataWatcher(List) WrappedDataWatcher(List)}
+     * @return The current metadata
+    */
+    public List<WrappedWatchableObject> getEntityMetadata() {
+        return handle.getWatchableCollectionModifier().read(0);
+    }
+    
+    /**
+     * Set the list of the watchable objects (meta data).
+     * @param value - new value.
+    */
+    public void setEntityMetadata(List<WrappedWatchableObject> value) {
+        handle.getWatchableCollectionModifier().write(0, value);
+    }
+}

HolographicDisplays/Plugin/com/gmail/filoghost/holographicdisplays/bridge/protocollib/current/WrapperPlayServerMount.java

@@ -0,0 +1,78 @@
+/*
+ *  PacketWrapper - Contains wrappers for each packet in Minecraft.
+ *  Copyright (C) 2012 Kristian S. Stangeland
+ *
+ *  This program is free software; you can redistribute it and/or modify it under the terms of the
+ *  GNU Lesser General Public License as published by the Free Software Foundation; either version 2 of
+ *  the License, or (at your option) any later version.
+ *
+ *  This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY;
+ *  without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+ *  See the GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License along with this program;
+ *  if not, write to the Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
+ *  02111-1307 USA
+ */
+
+package com.gmail.filoghost.holographicdisplays.bridge.protocollib.current;
+
+import java.util.List;
+
+import com.comphenix.protocol.PacketType;
+import com.comphenix.protocol.events.PacketContainer;
+import com.google.common.primitives.Ints;
+
+public class WrapperPlayServerMount extends AbstractPacket {
+	
+    public static final PacketType TYPE = PacketType.Play.Server.MOUNT;
+    
+    public WrapperPlayServerMount() {
+        super(new PacketContainer(TYPE), TYPE);
+        handle.getModifier().writeDefaults();
+    }
+    
+    public WrapperPlayServerMount(PacketContainer packet) {
+        super(packet, TYPE);
+    }
+    
+    /**
+     * Retrieve the player entity ID being attached.
+     * @return The current Entity ID
+    */
+    public int getVehicleId() {
+        return handle.getIntegers().read(0);
+    }
+    
+    /**
+     * Set the player entity ID being attached.
+     * @param value - new value.
+    */
+    public void setVehicleId(int value) {
+        handle.getIntegers().write(0, value);
+    }
+
+    /**
+     * Retrieve the IDs of the entities that will be destroyed.
+     * @return The current entities.
+    */
+    public List<Integer> getPassengers() {
+        return Ints.asList(handle.getIntegerArrays().read(0));
+    }
+    
+    /**
+     * Set the entities that will be destroyed.
+     * @param value - new value.
+    */
+    public void setPassengers(int[] entities) {
+        handle.getIntegerArrays().write(0, entities);
+    }
+    
+    /**
+     * Set the entities that will be destroyed.
+     * @param value - new value.
+    */
+    public void setPassengers(List<Integer> entities) {
+    	setPassengers(Ints.toArray(entities));
+    }
+}

HolographicDisplays/Plugin/com/gmail/filoghost/holographicdisplays/bridge/protocollib/current/WrapperPlayServerSpawnEntity.java

@@ -0,0 +1,148 @@
+/*
+ *  PacketWrapper - Contains wrappers for each packet in Minecraft.
+ *  Copyright (C) 2012 Kristian S. Stangeland
+ *
+ *  This program is free software; you can redistribute it and/or modify it under the terms of the
+ *  GNU Lesser General Public License as published by the Free Software Foundation; either version 2 of
+ *  the License, or (at your option) any later version.
+ *
+ *  This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY;
+ *  without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+ *  See the GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License along with this program;
+ *  if not, write to the Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
+ *  02111-1307 USA
+ */
+
+package com.gmail.filoghost.holographicdisplays.bridge.protocollib.current;
+import org.bukkit.World;
+import org.bukkit.entity.Entity;
+
+import com.comphenix.protocol.PacketType;
+import com.comphenix.protocol.ProtocolLibrary;
+import com.comphenix.protocol.events.PacketContainer;
+import com.comphenix.protocol.events.PacketEvent;
+import com.comphenix.protocol.injector.PacketConstructor;
+import com.comphenix.protocol.reflect.IntEnum;
+
+public class WrapperPlayServerSpawnEntity extends AbstractPacket {
+    public static final PacketType TYPE = PacketType.Play.Server.SPAWN_ENTITY;
+        
+    private static PacketConstructor entityConstructor;
+    
+    /**
+     * Represents the different object types.
+     * 
+     * @author Kristian
+     */
+    public static class ObjectTypes extends IntEnum {
+    	public static final int BOAT = 1;
+    	public static final int ITEM_STACK = 2;
+    	public static final int MINECART = 10;
+    	public static final int MINECART_STORAGE = 11;
+    	public static final int MINECART_POWERED = 12;
+    	public static final int ACTIVATED_TNT = 50;
+    	public static final int ENDER_CRYSTAL = 51;
+    	public static final int ARROW_PROJECTILE = 60;
+    	public static final int SNOWBALL_PROJECTILE = 61;
+    	public static final int EGG_PROJECTILE = 62;
+    	public static final int FIRE_BALL_GHAST = 63;
+    	public static final int FIRE_BALL_BLAZE = 64;
+    	public static final int THROWN_ENDERPEARL = 65;
+    	public static final int WITHER_SKULL = 66;
+    	public static final int FALLING_BLOCK = 70;
+    	public static final int ITEM_FRAME = 71;
+    	public static final int EYE_OF_ENDER = 72;
+    	public static final int THROWN_POTION = 73;
+    	public static final int FALLING_DRAGON_EGG = 74;
+    	public static final int THROWN_EXP_BOTTLE = 75;
+    	public static final int FIREWORK = 76;
+    	public static final int ARMOR_STAND = 78;
+    	public static final int FISHING_FLOAT = 90;
+
+		/**
+		 * The singleton instance. Can also be retrieved from the parent class.
+		 */
+		private static ObjectTypes INSTANCE = new ObjectTypes();
+    	
+		/**
+		 * Retrieve an instance of the object types enum.
+		 * @return Object type enum.
+		 */
+		public static ObjectTypes getInstance() {
+			return INSTANCE;
+		}
+    }
+    
+    public WrapperPlayServerSpawnEntity() {
+        super(new PacketContainer(TYPE), TYPE);
+        handle.getModifier().writeDefaults();
+    }
+    
+    public WrapperPlayServerSpawnEntity(PacketContainer packet) {
+        super(packet, TYPE);
+    }
+    
+    public WrapperPlayServerSpawnEntity(Entity entity, int type, int objectData) {
+    	super(fromEntity(entity, type, objectData), TYPE);
+    }
+    
+    // Useful constructor
+    private static PacketContainer fromEntity(Entity entity, int type, int objectData) {
+        if (entityConstructor == null)
+        	entityConstructor = ProtocolLibrary.getProtocolManager().createPacketConstructor(TYPE, entity, type, objectData);
+        return entityConstructor.createPacket(entity, type, objectData);
+    }
+    
+    /**
+     * Retrieve entity ID of the Object.
+     * @return The current EID
+    */
+    public int getEntityID() {
+        return handle.getIntegers().read(0);
+    }
+    
+    /**
+     * Retrieve the entity that will be spawned.
+     * @param world - the current world of the entity.
+     * @return The spawned entity.
+     */
+    public Entity getEntity(World world) {
+    	return handle.getEntityModifier(world).read(0);
+    }
+
+    /**
+     * Retrieve the entity that will be spawned.
+     * @param event - the packet event.
+     * @return The spawned entity.
+     */
+    public Entity getEntity(PacketEvent event) {
+    	return getEntity(event.getPlayer().getWorld());
+    }
+    
+    /**
+     * Set entity ID of the Object.
+     * @param value - new value.
+    */
+    public void setEntityID(int value) {
+        handle.getIntegers().write(0, value);
+    }
+    
+    /**
+     * Retrieve the type of object. See {@link ObjectTypes}
+     * @return The current Type
+    */
+    public int getType() {
+        return handle.getIntegers().read(6);
+    }
+    
+    /**
+     * Set the type of object. See {@link ObjectTypes}.
+     * @param value - new value.
+    */
+    public void setType(int value) {
+        handle.getIntegers().write(6, value);
+    }
+    
+}

HolographicDisplays/Plugin/com/gmail/filoghost/holographicdisplays/bridge/protocollib/current/WrapperPlayServerSpawnEntityLiving.java

@@ -0,0 +1,125 @@
+/*
+ *  PacketWrapper - Contains wrappers for each packet in Minecraft.
+ *  Copyright (C) 2012 Kristian S. Stangeland
+ *
+ *  This program is free software; you can redistribute it and/or modify it under the terms of the
+ *  GNU Lesser General Public License as published by the Free Software Foundation; either version 2 of
+ *  the License, or (at your option) any later version.
+ *
+ *  This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY;
+ *  without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+ *  See the GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License along with this program;
+ *  if not, write to the Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
+ *  02111-1307 USA
+ */
+
+package com.gmail.filoghost.holographicdisplays.bridge.protocollib.current;
+
+import org.bukkit.World;
+import org.bukkit.entity.Entity;
+import org.bukkit.entity.EntityType;
+
+import com.comphenix.protocol.PacketType;
+import com.comphenix.protocol.ProtocolLibrary;
+import com.comphenix.protocol.events.PacketContainer;
+import com.comphenix.protocol.events.PacketEvent;
+import com.comphenix.protocol.injector.PacketConstructor;
+import com.comphenix.protocol.wrappers.WrappedDataWatcher;
+
+public class WrapperPlayServerSpawnEntityLiving extends AbstractPacket {
+    public static final PacketType TYPE = PacketType.Play.Server.SPAWN_ENTITY_LIVING;
+    
+    private static PacketConstructor entityConstructor;
+    
+    public WrapperPlayServerSpawnEntityLiving() {
+        super(new PacketContainer(TYPE), TYPE);
+        handle.getModifier().writeDefaults();
+    }
+    
+    public WrapperPlayServerSpawnEntityLiving(PacketContainer packet) {
+        super(packet, TYPE);
+    }
+    
+    public WrapperPlayServerSpawnEntityLiving(Entity entity) {
+        super(fromEntity(entity), TYPE);
+    }
+    
+    // Useful constructor
+    private static PacketContainer fromEntity(Entity entity) {
+        if (entityConstructor == null)
+        	entityConstructor = ProtocolLibrary.getProtocolManager().createPacketConstructor(TYPE, entity);
+        return entityConstructor.createPacket(entity);
+    }
+    
+    /**
+     * Retrieve entity ID.
+     * @return The current EID
+    */
+    public int getEntityID() {
+        return handle.getIntegers().read(0);
+    }
+    
+    /**
+     * Retrieve the entity that will be spawned.
+     * @param world - the current world of the entity.
+     * @return The spawned entity.
+     */
+    public Entity getEntity(World world) {
+    	return handle.getEntityModifier(world).read(0);
+    }
+
+    /**
+     * Retrieve the entity that will be spawned.
+     * @param event - the packet event.
+     * @return The spawned entity.
+     */
+    public Entity getEntity(PacketEvent event) {
+    	return getEntity(event.getPlayer().getWorld());
+    }
+    
+    /**
+     * Set entity ID.
+     * @param value - new value.
+    */
+    public void setEntityID(int value) {
+        handle.getIntegers().write(0, value);
+    }
+    
+    /**
+     * Retrieve the type of mob.
+     * @return The current Type
+    */
+    @SuppressWarnings("deprecation")
+	public EntityType getType() {
+        return EntityType.fromId(handle.getIntegers().read(1));
+    }
+    
+    /**
+     * Set the type of mob.
+     * @param value - new value.
+    */
+    @SuppressWarnings("deprecation")
+	public void setType(EntityType value) {
+        handle.getIntegers().write(1, (int) value.getTypeId());
+    }
+    
+    /**
+     * Retrieve the data watcher.
+     * <p>
+     * Content varies by mob, see Entities.
+     * @return The current Metadata
+    */
+    public WrappedDataWatcher getMetadata() {
+        return handle.getDataWatcherModifier().read(0);
+    }
+    
+    /**
+     * Set the data watcher.
+     * @param value - new value.
+    */
+    public void setMetadata(WrappedDataWatcher value) {
+        handle.getDataWatcherModifier().write(0, value);
+    }
+}

HolographicDisplays/Plugin/com/gmail/filoghost/holographicdisplays/bridge/protocollib/pre1_9/AbstractPacket.java

@@ -15,7 +15,7 @@
  *  02111-1307 USA
  */
 
-package com.gmail.filoghost.holographicdisplays.bridge.protocollib;
+package com.gmail.filoghost.holographicdisplays.bridge.protocollib.pre1_9;
 
 import java.lang.reflect.InvocationTargetException;
 

HolographicDisplays/Plugin/com/gmail/filoghost/holographicdisplays/bridge/protocollib/pre1_9/ProtocolLibHook.java

@@ -1,4 +1,4 @@
-package com.gmail.filoghost.holographicdisplays.bridge.protocollib;
+package com.gmail.filoghost.holographicdisplays.bridge.protocollib.pre1_9;
 
 import java.util.List;
 
@@ -17,7 +17,7 @@ import com.comphenix.protocol.events.PacketEvent;
 import com.comphenix.protocol.wrappers.WrappedDataWatcher;
 import com.comphenix.protocol.wrappers.WrappedWatchableObject;
 import com.gmail.filoghost.holographicdisplays.HolographicDisplays;
-import com.gmail.filoghost.holographicdisplays.bridge.protocollib.WrapperPlayServerSpawnEntity.ObjectTypes;
+import com.gmail.filoghost.holographicdisplays.bridge.protocollib.pre1_9.WrapperPlayServerSpawnEntity.ObjectTypes;
 import com.gmail.filoghost.holographicdisplays.nms.interfaces.NMSManager;
 import com.gmail.filoghost.holographicdisplays.nms.interfaces.entity.NMSEntityBase;
 import com.gmail.filoghost.holographicdisplays.object.CraftHologram;
@@ -236,7 +236,7 @@ public class ProtocolLibHook {
 						itemPacket.sendPacket(player);
 						
 						AbstractPacket vehiclePacket;
-						if (HolographicDisplays.is1_8()) {
+						if (HolographicDisplays.is18orGreater()) {
 							// In 1.8 we have armor stands, that are living entities.
 							vehiclePacket = new WrapperPlayServerSpawnEntityLiving(itemLine.getNmsVehicle().getBukkitEntityNMS());
 						} else {
@@ -272,7 +272,7 @@ public class ProtocolLibHook {
 					if (touchSlime.isSpawned()) {
 						AbstractPacket vehiclePacket;
 							
-						if (HolographicDisplays.is1_8()) {
+						if (HolographicDisplays.is18orGreater()) {
 							// Armor stand vehicle
 							vehiclePacket = new WrapperPlayServerSpawnEntityLiving(touchSlime.getNmsVehicle().getBukkitEntityNMS());
 						} else {

HolographicDisplays/Plugin/com/gmail/filoghost/holographicdisplays/bridge/protocollib/pre1_9/WrapperPlayServerAttachEntity.java

@@ -15,7 +15,7 @@
  *  02111-1307 USA
  */
 
-package com.gmail.filoghost.holographicdisplays.bridge.protocollib;
+package com.gmail.filoghost.holographicdisplays.bridge.protocollib.pre1_9;
 
 import org.bukkit.World;
 import org.bukkit.entity.Entity;

HolographicDisplays/Plugin/com/gmail/filoghost/holographicdisplays/bridge/protocollib/pre1_9/WrapperPlayServerEntityDestroy.java

@@ -15,7 +15,7 @@
  *  02111-1307 USA
  */
 
-package com.gmail.filoghost.holographicdisplays.bridge.protocollib;
+package com.gmail.filoghost.holographicdisplays.bridge.protocollib.pre1_9;
 
 import java.util.List;
 

HolographicDisplays/Plugin/com/gmail/filoghost/holographicdisplays/bridge/protocollib/pre1_9/WrapperPlayServerEntityMetadata.java

@@ -15,7 +15,7 @@
  *  02111-1307 USA
  */
 
-package com.gmail.filoghost.holographicdisplays.bridge.protocollib;
+package com.gmail.filoghost.holographicdisplays.bridge.protocollib.pre1_9;
 
 import java.util.List;
 

HolographicDisplays/Plugin/com/gmail/filoghost/holographicdisplays/bridge/protocollib/pre1_9/WrapperPlayServerSpawnEntity.java

@@ -15,7 +15,7 @@
  *  02111-1307 USA
  */
 
-package com.gmail.filoghost.holographicdisplays.bridge.protocollib;
+package com.gmail.filoghost.holographicdisplays.bridge.protocollib.pre1_9;
 import org.bukkit.World;
 import org.bukkit.entity.Entity;
 

HolographicDisplays/Plugin/com/gmail/filoghost/holographicdisplays/bridge/protocollib/pre1_9/WrapperPlayServerSpawnEntityLiving.java

@@ -15,7 +15,7 @@
  *  02111-1307 USA
  */
 
-package com.gmail.filoghost.holographicdisplays.bridge.protocollib;
+package com.gmail.filoghost.holographicdisplays.bridge.protocollib.pre1_9;
 
 import org.bukkit.World;
 import org.bukkit.entity.Entity;

HolographicDisplays/Plugin/com/gmail/filoghost/holographicdisplays/commands/main/subs/FixCommand.java

@@ -37,7 +37,7 @@ public class FixCommand extends HologramSubCommand {
 	@Override
 	public void execute(CommandSender sender, String label, String[] args) throws CommandException {
 		
-		CommandValidator.isTrue(!HolographicDisplays.is1_8(), "This command is no longer necessary in 1.8+. The holograms already use the correct ambient light.");
+		CommandValidator.isTrue(!HolographicDisplays.is18orGreater(), "This command is no longer necessary in 1.8+. The holograms already use the correct ambient light.");
 		
 		NamedHologram hologram = NamedHologramManager.getHologram(args[0].toLowerCase());
 		CommandValidator.notNull(hologram, Strings.noSuchHologram(args[0].toLowerCase()));
@@ -70,7 +70,11 @@ public class FixCommand extends HologramSubCommand {
 	
 	@Override
 	public SubCommandType getType() {
-		return SubCommandType.GENERIC;
+		if (HolographicDisplays.is18orGreater()) {
+			return SubCommandType.HIDDEN;
+		} else {
+			return SubCommandType.GENERIC;
+		}
 	}
 
 }

HolographicDisplays/Plugin/com/gmail/filoghost/holographicdisplays/listener/MainListener.java

@@ -95,16 +95,16 @@ public class MainListener implements Listener {
 	public void onSlimeInteract(PlayerInteractEntityEvent event) {
 		if (event.getRightClicked().getType() == EntityType.SLIME) {
 			
+			Player clicker = event.getPlayer();
 			NMSEntityBase entityBase = nmsManager.getNMSEntityBase(event.getRightClicked());
-			if (entityBase == null) return;
 			
-			if (entityBase.getHologramLine() instanceof CraftTouchSlimeLine) {
+			if (entityBase != null && entityBase.getHologramLine() instanceof CraftTouchSlimeLine && !isSpectatorMode(clicker)) {
 				
 				CraftTouchSlimeLine touchSlime = (CraftTouchSlimeLine) entityBase.getHologramLine();
 				
-				if (touchSlime.getTouchablePiece().getTouchHandler() != null && touchSlime.getParent().getVisibilityManager().isVisibleTo(event.getPlayer())) {
+				if (touchSlime.getTouchablePiece().getTouchHandler() != null && touchSlime.getParent().getVisibilityManager().isVisibleTo(clicker)) {
 					
-					Long lastClick = anticlickSpam.get(event.getPlayer());
+					Long lastClick = anticlickSpam.get(clicker);
 					if (lastClick != null && System.currentTimeMillis() - lastClick.longValue() < 100) {
 						return;
 					}
@@ -117,11 +117,15 @@ public class MainListener implements Listener {
 						Plugin plugin = touchSlime.getParent() instanceof PluginHologram ? ((PluginHologram) touchSlime.getParent()).getOwner() : HolographicDisplays.getInstance();
 						HolographicDisplays.getInstance().getLogger().log(Level.WARNING, "The plugin " + plugin.getName() + " generated an exception when the player " + event.getPlayer().getName() + " touched a hologram.", ex);
 					}
-				}	
+				}
 			}
 		}
 	}
 	
+	public static boolean isSpectatorMode(Player player) {
+		return player.getGameMode().toString().equals("SPECTATOR");
+	}
+	
 	public static void handleItemLinePickup(Player player, PickupHandler pickupHandler, CraftHologram hologram) {
 		try {
 			if (hologram.getVisibilityManager().isVisibleTo(player)) {

HolographicDisplays/Plugin/com/gmail/filoghost/holographicdisplays/metrics/MetricsLite.java

@@ -35,6 +35,8 @@ import org.bukkit.plugin.Plugin;
 import org.bukkit.plugin.PluginDescriptionFile;
 import org.bukkit.scheduler.BukkitTask;
 
+import com.gmail.filoghost.holographicdisplays.util.VersionUtils;
+
 import java.io.BufferedReader;
 import java.io.ByteArrayOutputStream;
 import java.io.File;
@@ -277,7 +279,6 @@ public class MetricsLite {
     /**
      * Generic method that posts a plugin to the metrics website
      */
-    @SuppressWarnings("deprecation")
 	private void postPlugin(boolean isPing) throws IOException {
         // Server software specific section
         PluginDescriptionFile description = plugin.getDescription();
@@ -285,7 +286,7 @@ public class MetricsLite {
         boolean onlineMode = Bukkit.getServer().getOnlineMode(); // TRUE if online mode is enabled
         String pluginVersion = description.getVersion();
         String serverVersion = Bukkit.getVersion();
-        int playersOnline = Bukkit.getServer().getOnlinePlayers().length;
+        int playersOnline = VersionUtils.getOnlinePlayers().size();
 
         // END server software specific section -- all code below does not use any code outside of this class / Java
 

HolographicDisplays/Plugin/com/gmail/filoghost/holographicdisplays/nms/v1_9_R1/CraftNMSArmorStand.java

@@ -0,0 +1,68 @@
+package com.gmail.filoghost.holographicdisplays.nms.v1_9_R1;
+
+import java.util.Collection;
+
+import org.bukkit.EntityEffect;
+import org.bukkit.Location;
+import org.bukkit.craftbukkit.v1_9_R1.CraftServer;
+import org.bukkit.craftbukkit.v1_9_R1.entity.CraftArmorStand;
+import org.bukkit.entity.Entity;
+import org.bukkit.event.player.PlayerTeleportEvent.TeleportCause;
+import org.bukkit.inventory.ItemStack;
+import org.bukkit.potion.PotionEffect;
+import org.bukkit.util.EulerAngle;
+import org.bukkit.util.Vector;
+
+public class CraftNMSArmorStand extends CraftArmorStand {
+
+	public CraftNMSArmorStand(CraftServer server, EntityNMSArmorStand entity) {
+		super(server, entity);
+	}
+	
+	// Disallow all the bukkit methods.
+	
+	@Override
+	public void remove() {
+		// Cannot be removed, this is the most important to override.
+	}
+
+	// Methods from Armor stand class
+	@Override public void setArms(boolean arms) { }
+	@Override public void setBasePlate(boolean basePlate) { }
+	@Override public void setBodyPose(EulerAngle pose) { }
+	@Override public void setBoots(ItemStack item) { }
+	@Override public void setChestplate(ItemStack item) { }
+	@Override public void setGravity(boolean gravity) { }
+	@Override public void setHeadPose(EulerAngle pose) { }
+	@Override public void setHelmet(ItemStack item) { }
+	@Override public void setItemInHand(ItemStack item) { }
+	@Override public void setLeftArmPose(EulerAngle pose) { }
+	@Override public void setLeftLegPose(EulerAngle pose) { }
+	@Override public void setLeggings(ItemStack item) { }
+	@Override public void setRightArmPose(EulerAngle pose) { }
+	@Override public void setRightLegPose(EulerAngle pose) { }
+	@Override public void setSmall(boolean small) { }
+	@Override public void setVisible(boolean visible) { }
+	@Override public void setMarker(boolean marker) { }
+
+	// Methods from LivingEntity class
+	@Override public boolean addPotionEffect(PotionEffect effect) { return false; }
+	@Override public boolean addPotionEffect(PotionEffect effect, boolean param) { return false; }
+	@Override public boolean addPotionEffects(Collection<PotionEffect> effects) { return false; }
+	@Override public void setRemoveWhenFarAway(boolean remove) { }
+	
+	// Methods from Entity
+	@Override public void setVelocity(Vector vel) { }
+	@Override public boolean teleport(Location loc) { return false; }
+	@Override public boolean teleport(Entity entity) { return false; }
+	@Override public boolean teleport(Location loc, TeleportCause cause) { return false; }
+	@Override public boolean teleport(Entity entity, TeleportCause cause) { return false; }
+	@Override public void setFireTicks(int ticks) { }
+	@Override public boolean setPassenger(Entity entity) { return false; }
+	@Override public boolean eject() { return false; }
+	@Override public boolean leaveVehicle() { return false; }
+	@Override public void playEffect(EntityEffect effect) { }
+	@Override public void setCustomName(String name) { }
+	@Override public void setCustomNameVisible(boolean flag) { }
+	
+}

HolographicDisplays/Plugin/com/gmail/filoghost/holographicdisplays/nms/v1_9_R1/CraftNMSItem.java

@@ -0,0 +1,43 @@
+package com.gmail.filoghost.holographicdisplays.nms.v1_9_R1;
+
+import org.bukkit.EntityEffect;
+import org.bukkit.Location;
+import org.bukkit.craftbukkit.v1_9_R1.CraftServer;
+import org.bukkit.craftbukkit.v1_9_R1.entity.CraftItem;
+import org.bukkit.entity.Entity;
+import org.bukkit.event.player.PlayerTeleportEvent.TeleportCause;
+import org.bukkit.inventory.ItemStack;
+import org.bukkit.util.Vector;
+
+public class CraftNMSItem extends CraftItem {
+
+	public CraftNMSItem(CraftServer server, EntityNMSItem entity) {
+		super(server, entity);
+	}
+
+	// Disallow all the bukkit methods.
+	
+	@Override
+	public void remove() {
+		// Cannot be removed, this is the most important to override.
+	}
+
+	// Methods from Entity
+	@Override public void setVelocity(Vector vel) { }
+	@Override public boolean teleport(Location loc) { return false; }
+	@Override public boolean teleport(Entity entity) { return false; }
+	@Override public boolean teleport(Location loc, TeleportCause cause) { return false; }
+	@Override public boolean teleport(Entity entity, TeleportCause cause) { return false; }
+	@Override public void setFireTicks(int ticks) { }
+	@Override public boolean setPassenger(Entity entity) { return false; }
+	@Override public boolean eject() { return false; }
+	@Override public boolean leaveVehicle() { return false; }
+	@Override public void playEffect(EntityEffect effect) { }
+	@Override public void setCustomName(String name) { }
+	@Override public void setCustomNameVisible(boolean flag) { }
+	
+	// Methods from Item
+	@Override public void setItemStack(ItemStack stack) { }
+	@Override public void setPickupDelay(int delay) { }
+	
+}

HolographicDisplays/Plugin/com/gmail/filoghost/holographicdisplays/nms/v1_9_R1/CraftNMSSlime.java

@@ -0,0 +1,50 @@
+package com.gmail.filoghost.holographicdisplays.nms.v1_9_R1;
+
+import java.util.Collection;
+
+import org.bukkit.EntityEffect;
+import org.bukkit.Location;
+import org.bukkit.craftbukkit.v1_9_R1.CraftServer;
+import org.bukkit.craftbukkit.v1_9_R1.entity.CraftSlime;
+import org.bukkit.entity.Entity;
+import org.bukkit.event.player.PlayerTeleportEvent.TeleportCause;
+import org.bukkit.potion.PotionEffect;
+import org.bukkit.util.Vector;
+
+public class CraftNMSSlime extends CraftSlime {
+
+	public CraftNMSSlime(CraftServer server, EntityNMSSlime entity) {
+		super(server, entity);
+	}
+	
+	// Disallow all the bukkit methods.
+	
+	@Override
+	public void remove() {
+		// Cannot be removed, this is the most important to override.
+	}
+	
+	// Methods from LivingEntity class
+	@Override public boolean addPotionEffect(PotionEffect effect) { return false; }
+	@Override public boolean addPotionEffect(PotionEffect effect, boolean param) { return false; }
+	@Override public boolean addPotionEffects(Collection<PotionEffect> effects) { return false; }
+	@Override public void setRemoveWhenFarAway(boolean remove) { }
+	
+	// Methods from Entity
+	@Override public void setVelocity(Vector vel) { }
+	@Override public boolean teleport(Location loc) { return false; }
+	@Override public boolean teleport(Entity entity) { return false; }
+	@Override public boolean teleport(Location loc, TeleportCause cause) { return false; }
+	@Override public boolean teleport(Entity entity, TeleportCause cause) { return false; }
+	@Override public void setFireTicks(int ticks) { }
+	@Override public boolean setPassenger(Entity entity) { return false; }
+	@Override public boolean eject() { return false; }
+	@Override public boolean leaveVehicle() { return false; }
+	@Override public void playEffect(EntityEffect effect) { }
+	@Override public void setCustomName(String name) { }
+	@Override public void setCustomNameVisible(boolean flag) { }
+	
+	// Methods from Slime
+	@Override public void setSize(int size) { }
+	
+}

HolographicDisplays/Plugin/com/gmail/filoghost/holographicdisplays/nms/v1_9_R1/EntityNMSArmorStand.java

@@ -0,0 +1,236 @@
+package com.gmail.filoghost.holographicdisplays.nms.v1_9_R1;
+
+import net.minecraft.server.v1_9_R1.AxisAlignedBB;
+import net.minecraft.server.v1_9_R1.DamageSource;
+import net.minecraft.server.v1_9_R1.EntityArmorStand;
+import net.minecraft.server.v1_9_R1.EntityHuman;
+import net.minecraft.server.v1_9_R1.EntityPlayer;
+import net.minecraft.server.v1_9_R1.EnumHand;
+import net.minecraft.server.v1_9_R1.EnumInteractionResult;
+import net.minecraft.server.v1_9_R1.EnumItemSlot;
+import net.minecraft.server.v1_9_R1.ItemStack;
+import net.minecraft.server.v1_9_R1.NBTTagCompound;
+import net.minecraft.server.v1_9_R1.PacketPlayOutEntityTeleport;
+import net.minecraft.server.v1_9_R1.SoundEffect;
+import net.minecraft.server.v1_9_R1.Vec3D;
+import net.minecraft.server.v1_9_R1.World;
+
+import org.bukkit.craftbukkit.v1_9_R1.entity.CraftEntity;
+
+import com.gmail.filoghost.holographicdisplays.nms.interfaces.entity.NMSArmorStand;
+import com.gmail.filoghost.holographicdisplays.object.line.CraftHologramLine;
+import com.gmail.filoghost.holographicdisplays.util.ReflectionUtils;
+import com.gmail.filoghost.holographicdisplays.util.Utils;
+
+public class EntityNMSArmorStand extends EntityArmorStand implements NMSArmorStand {
+
+	private boolean lockTick;
+	private CraftHologramLine parentPiece;
+	
+	public EntityNMSArmorStand(World world, CraftHologramLine parentPiece) {
+		super(world);
+		super.setInvisible(true);
+		super.setSmall(true);
+		super.setArms(false);
+		super.setGravity(true);
+		super.setBasePlate(true);
+		super.setMarker(true);
+		this.parentPiece = parentPiece;
+		try {
+			ReflectionUtils.setPrivateField(EntityArmorStand.class, this, "bz", Integer.MAX_VALUE);
+		} catch (Exception e) {
+			// There's still the overridden method.
+		}
+		forceSetBoundingBox(new NullBoundingBox());
+	}
+	
+	
+	@Override
+	public void b(NBTTagCompound nbttagcompound) {
+		// Do not save NBT.
+	}
+	
+	@Override
+	public boolean c(NBTTagCompound nbttagcompound) {
+		// Do not save NBT.
+		return false;
+	}
+
+	@Override
+	public boolean d(NBTTagCompound nbttagcompound) {
+		// Do not save NBT.
+		return false;
+	}
+	
+	@Override
+	public void e(NBTTagCompound nbttagcompound) {
+		// Do not save NBT.
+	}
+	
+	@Override
+	public void f(NBTTagCompound nbttagcompound) {
+		// Do not load NBT.
+	}
+	
+	@Override
+	public void a(NBTTagCompound nbttagcompound) {
+		// Do not load NBT.
+	}
+	
+	
+	@Override
+	public boolean isInvulnerable(DamageSource source) {
+		/*
+		 * The field Entity.invulnerable is private.
+		 * It's only used while saving NBTTags, but since the entity would be killed
+		 * on chunk unload, we prefer to override isInvulnerable().
+		 */
+	    return true;
+	}
+	
+	@Override
+	public boolean isCollidable() {
+		return false;
+	}
+	
+	@Override
+	public void setCustomName(String customName) {
+		// Locks the custom name.
+	}
+	
+	@Override
+	public void setCustomNameVisible(boolean visible) {
+		// Locks the custom name.
+	}
+
+	@Override
+	public EnumInteractionResult a(EntityHuman human, Vec3D vec3d, ItemStack itemstack, EnumHand enumhand) {
+		// Prevent stand being equipped
+		return EnumInteractionResult.PASS;
+	}
+
+	@Override
+	public boolean c(int i, ItemStack item) {
+		// Prevent stand being equipped
+		return false;
+	}
+
+	@Override
+	public void setSlot(EnumItemSlot enumitemslot, ItemStack itemstack) {
+		// Prevent stand being equipped
+	}
+	
+	@Override
+	public void a(AxisAlignedBB boundingBox) {
+		// Do not change it!
+	}
+	
+	public void forceSetBoundingBox(AxisAlignedBB boundingBox) {
+		super.a(boundingBox);
+	}
+	
+	@Override
+	public int getId() {
+		
+		StackTraceElement[] elements = Thread.currentThread().getStackTrace();
+		if (elements.length > 2 && elements[2] != null && elements[2].getFileName().equals("EntityTrackerEntry.java") && elements[2].getLineNumber() > 142 && elements[2].getLineNumber() < 152) {
+			// Then this method is being called when creating a new packet, we return a fake ID!
+			return -1;
+		}
+		
+		return super.getId();
+	}
+
+	@Override
+	public void m() {
+		if (!lockTick) {
+			super.m();
+		}
+	}
+	
+	@Override
+	public void a(SoundEffect soundeffect, float f, float f1) {
+	    // Remove sounds.
+	}
+	
+	@Override
+	public void setCustomNameNMS(String name) {
+		if (name != null && name.length() > 300) {
+			name = name.substring(0, 300);
+		}
+		super.setCustomName(name);
+		super.setCustomNameVisible(name != null && !name.isEmpty());
+	}
+	
+	@Override
+	public String getCustomNameNMS() {
+		return super.getCustomName();
+	}
+	
+	
+	public void callSuperTick() {
+		super.h();
+	}
+	
+	@Override
+	public void setLockTick(boolean lock) {
+		lockTick = lock;
+	}
+	
+	@Override
+	public void die() {
+		// Prevent being killed.
+	}
+	
+	@Override
+	public CraftEntity getBukkitEntity() {
+		if (super.bukkitEntity == null) {
+			super.bukkitEntity = new CraftNMSArmorStand(super.world.getServer(), this);
+	    }
+		return super.bukkitEntity;
+	}
+	
+	@Override
+	public void killEntityNMS() {
+		super.dead = true;
+	}
+	
+	@Override
+	public void setLocationNMS(double x, double y, double z) {
+		super.setPosition(x, y, z);
+		
+		// Send a packet near to update the position.
+		PacketPlayOutEntityTeleport teleportPacket = new PacketPlayOutEntityTeleport(this);
+
+		for (Object obj : super.world.players) {
+			if (obj instanceof EntityPlayer) {
+				EntityPlayer nmsPlayer = (EntityPlayer) obj;
+
+				double distanceSquared = Utils.square(nmsPlayer.locX - super.locX) + Utils.square(nmsPlayer.locZ - super.locZ);
+				if (distanceSquared < 8192 && nmsPlayer.playerConnection != null) {
+					nmsPlayer.playerConnection.sendPacket(teleportPacket);
+				}
+			}
+		}
+	}
+
+	@Override
+	public boolean isDeadNMS() {
+		return super.dead;
+	}
+	
+	@Override
+	public int getIdNMS() {
+		return super.getId(); // Return the real ID without checking the stack trace.
+	}
+
+	@Override
+	public CraftHologramLine getHologramLine() {
+		return parentPiece;
+	}
+	
+	@Override
+	public org.bukkit.entity.Entity getBukkitEntityNMS() {
+		return getBukkitEntity();
+	}
+}

HolographicDisplays/Plugin/com/gmail/filoghost/holographicdisplays/nms/v1_9_R1/EntityNMSItem.java

@@ -0,0 +1,261 @@
+package com.gmail.filoghost.holographicdisplays.nms.v1_9_R1;
+
+import net.minecraft.server.v1_9_R1.Entity;
+import net.minecraft.server.v1_9_R1.Blocks;
+import net.minecraft.server.v1_9_R1.DamageSource;
+import net.minecraft.server.v1_9_R1.EntityHuman;
+import net.minecraft.server.v1_9_R1.EntityItem;
+import net.minecraft.server.v1_9_R1.EntityPlayer;
+import net.minecraft.server.v1_9_R1.ItemStack;
+import net.minecraft.server.v1_9_R1.NBTTagCompound;
+import net.minecraft.server.v1_9_R1.NBTTagList;
+import net.minecraft.server.v1_9_R1.NBTTagString;
+import net.minecraft.server.v1_9_R1.PacketPlayOutMount;
+import net.minecraft.server.v1_9_R1.World;
+
+import org.bukkit.craftbukkit.v1_9_R1.entity.CraftEntity;
+import org.bukkit.craftbukkit.v1_9_R1.inventory.CraftItemStack;
+import org.bukkit.entity.Player;
+
+import com.gmail.filoghost.holographicdisplays.listener.MainListener;
+import com.gmail.filoghost.holographicdisplays.nms.interfaces.entity.NMSEntityBase;
+import com.gmail.filoghost.holographicdisplays.nms.interfaces.entity.NMSItem;
+import com.gmail.filoghost.holographicdisplays.object.line.CraftItemLine;
+import com.gmail.filoghost.holographicdisplays.util.DebugHandler;
+import com.gmail.filoghost.holographicdisplays.util.ItemUtils;
+import com.gmail.filoghost.holographicdisplays.util.ReflectionUtils;
+import com.gmail.filoghost.holographicdisplays.util.Utils;
+
+public class EntityNMSItem extends EntityItem implements NMSItem {
+	
+	private boolean lockTick;
+	private CraftItemLine parentPiece;
+	
+	private int resendMountPacketTicks;
+	
+	public EntityNMSItem(World world, CraftItemLine piece) {
+		super(world);
+		super.pickupDelay = Integer.MAX_VALUE;
+		this.parentPiece = piece;
+	}
+	
+	@Override
+	public void m() {
+		
+		// So it won't get removed.
+		ticksLived = 0;
+		
+		if (resendMountPacketTicks++ > 20) {
+			resendMountPacketTicks = 0;
+			
+			if (by() != null) {
+				// Send a packet near to "remind" players that the item is riding the armor stand (Spigot bug or client bug)
+				PacketPlayOutMount mountPacket = new PacketPlayOutMount(by());
+	
+				for (Object obj : super.world.players) {
+					if (obj instanceof EntityPlayer) {
+						EntityPlayer nmsPlayer = (EntityPlayer) obj;
+	
+						double distanceSquared = Utils.square(nmsPlayer.locX - super.locX) + Utils.square(nmsPlayer.locZ - super.locZ);
+						if (distanceSquared < 1024 && nmsPlayer.playerConnection != null) {
+							nmsPlayer.playerConnection.sendPacket(mountPacket);
+						}
+					}
+				}
+			}
+		}
+		
+		if (!lockTick) {
+			super.m();
+		}
+	}
+	
+	@Override
+	public ItemStack getItemStack() {
+		// Dirty method to check if the icon is being picked up
+		StackTraceElement[] stacktrace = Thread.currentThread().getStackTrace();
+		if (stacktrace.length > 2 && stacktrace[2].getClassName().contains("EntityInsentient")) {
+			return null; // Try to pickup this, dear entity ignoring the pickupDelay!
+		}
+		
+		return super.getItemStack();
+	}
+	
+	// Method called when a player is near.
+	@Override
+	public void d(EntityHuman human) {
+		
+		if (human.locY < super.locY - 1.5 || human.locY > super.locY + 1.0) {
+			// Too low or too high, it's a bit weird.
+			return;
+		}
+		
+		if (parentPiece.getPickupHandler() != null && human instanceof EntityPlayer) {
+			MainListener.handleItemLinePickup((Player) human.getBukkitEntity(), parentPiece.getPickupHandler(), parentPiece.getParent());
+			// It is never added to the inventory.
+		}
+	}
+	
+	@Override
+	public void b(NBTTagCompound nbttagcompound) {
+		// Do not save NBT.
+	}
+	
+	@Override
+	public boolean c(NBTTagCompound nbttagcompound) {
+		// Do not save NBT.
+		return false;
+	}
+
+	@Override
+	public boolean d(NBTTagCompound nbttagcompound) {
+		// Do not save NBT.
+		return false;
+	}
+	
+	@Override
+	public void e(NBTTagCompound nbttagcompound) {
+		// Do not save NBT.
+	}
+	
+	@Override
+	public void f(NBTTagCompound nbttagcompound) {
+		// Do not load NBT.
+	}
+	
+	@Override
+	public void a(NBTTagCompound nbttagcompound) {
+		// Do not load NBT.
+	}
+	
+	@Override
+	public boolean isInvulnerable(DamageSource source) {
+		/*
+		 * The field Entity.invulnerable is private.
+		 * It's only used while saving NBTTags, but since the entity would be killed
+		 * on chunk unload, we prefer to override isInvulnerable().
+		 */
+	    return true;
+	}
+	
+	@Override
+	public boolean isCollidable() {
+		return false;
+	}
+	
+	@Override
+	public void inactiveTick() {
+		// Check inactive ticks.
+		
+		if (!lockTick) {
+			super.inactiveTick();
+		}
+	}
+
+	@Override
+	public void setLockTick(boolean lock) {
+		lockTick = lock;
+	}
+	
+	@Override
+	public void die() {
+		// Prevent being killed.
+	}
+
+	@Override
+	public CraftEntity getBukkitEntity() {
+		if (super.bukkitEntity == null) {
+			super.bukkitEntity = new CraftNMSItem(super.world.getServer(), this);
+	    }
+		return super.bukkitEntity;
+	}
+
+	@Override
+	public boolean isDeadNMS() {
+		return super.dead;
+	}
+	
+	@Override
+	public void killEntityNMS() {
+		super.dead = true;
+	}
+	
+	@Override
+	public void setLocationNMS(double x, double y, double z) {
+		super.setPosition(x, y, z);
+	}
+
+	@Override
+	public void setItemStackNMS(org.bukkit.inventory.ItemStack stack) {
+		ItemStack newItem = CraftItemStack.asNMSCopy(stack);
+		
+		if (newItem == null) {
+			newItem = new ItemStack(Blocks.BEDROCK);
+		}
+		
+		if (newItem.getTag() == null) {
+			newItem.setTag(new NBTTagCompound());
+		}
+		NBTTagCompound display = newItem.getTag().getCompound("display");
+		
+		if (!newItem.getTag().hasKey("display")) {
+		newItem.getTag().set("display", display);
+		}
+		
+		NBTTagList tagList = new NBTTagList();
+		tagList.add(new NBTTagString(ItemUtils.ANTISTACK_LORE)); // Antistack lore
+		
+		display.set("Lore", tagList);
+		newItem.count = 0;
+		setItemStack(newItem);
+	}
+	
+	@Override
+	public int getIdNMS() {
+		return super.getId();
+	}
+	
+	@Override
+	public CraftItemLine getHologramLine() {
+		return parentPiece;
+	}
+	
+	@Override
+	public void allowPickup(boolean pickup) {
+		if (pickup) {
+			super.pickupDelay = 0;
+		} else {
+			super.pickupDelay = Integer.MAX_VALUE;
+		}
+	}
+	
+	@Override
+	public org.bukkit.entity.Entity getBukkitEntityNMS() {
+		return getBukkitEntity();
+	}
+	
+	@Override
+	public void setPassengerOfNMS(NMSEntityBase vehicleBase) {
+		if (vehicleBase == null || !(vehicleBase instanceof Entity)) {
+			// It should never dismount
+			return;
+		}
+		
+		Entity entity = (Entity) vehicleBase;
+
+		try {
+			if (super.by() != null) {
+	        	Entity oldVehicle = super.by();
+	        	ReflectionUtils.setPrivateField(Entity.class, this, "as", null);
+	        	oldVehicle.passengers.remove(this);
+	        }
+
+	        ReflectionUtils.setPrivateField(Entity.class, this, "as", entity);
+	        entity.passengers.clear();
+	        entity.passengers.add(this);
+
+		} catch (Exception ex) {
+			DebugHandler.handleDebugException(ex);
+		}
+	}
+}

HolographicDisplays/Plugin/com/gmail/filoghost/holographicdisplays/nms/v1_9_R1/EntityNMSSlime.java

@@ -0,0 +1,228 @@
+package com.gmail.filoghost.holographicdisplays.nms.v1_9_R1;
+
+import net.minecraft.server.v1_9_R1.EntityDamageSource;
+import net.minecraft.server.v1_9_R1.EntityPlayer;
+import net.minecraft.server.v1_9_R1.AxisAlignedBB;
+import net.minecraft.server.v1_9_R1.DamageSource;
+import net.minecraft.server.v1_9_R1.Entity;
+import net.minecraft.server.v1_9_R1.EntitySlime;
+import net.minecraft.server.v1_9_R1.NBTTagCompound;
+import net.minecraft.server.v1_9_R1.PacketPlayOutMount;
+import net.minecraft.server.v1_9_R1.SoundEffect;
+import net.minecraft.server.v1_9_R1.World;
+
+import org.bukkit.Bukkit;
+import org.bukkit.craftbukkit.v1_9_R1.entity.CraftEntity;
+import org.bukkit.event.player.PlayerInteractEntityEvent;
+
+import com.gmail.filoghost.holographicdisplays.nms.interfaces.entity.NMSEntityBase;
+import com.gmail.filoghost.holographicdisplays.nms.interfaces.entity.NMSSlime;
+import com.gmail.filoghost.holographicdisplays.object.line.CraftHologramLine;
+import com.gmail.filoghost.holographicdisplays.object.line.CraftTouchSlimeLine;
+import com.gmail.filoghost.holographicdisplays.util.DebugHandler;
+import com.gmail.filoghost.holographicdisplays.util.ReflectionUtils;
+import com.gmail.filoghost.holographicdisplays.util.Utils;
+
+public class EntityNMSSlime extends EntitySlime implements NMSSlime {
+
+	private boolean lockTick;
+	private CraftTouchSlimeLine parentPiece;
+	
+	private int resendMountPacketTicks;
+	
+	public EntityNMSSlime(World world, CraftTouchSlimeLine parentPiece) {
+		super(world);
+		super.persistent = true;
+		a(0.0F, 0.0F);
+		setSize(1);
+		setInvisible(true);
+		this.parentPiece = parentPiece;
+		forceSetBoundingBox(new NullBoundingBox());
+	}
+	
+	@Override
+	public void a(AxisAlignedBB boundingBox) {
+		// Do not change it!
+	}
+	
+	public void forceSetBoundingBox(AxisAlignedBB boundingBox) {
+		super.a(boundingBox);
+	}
+	
+	@Override
+	public void m() {
+		
+		// So it won't get removed.
+		ticksLived = 0;
+		
+		if (resendMountPacketTicks++ > 20) {
+			resendMountPacketTicks = 0;
+
+			if (by() != null) {
+				// Send a packet near to "remind" players that the slime is riding the armor stand (Spigot bug or client bug)
+				PacketPlayOutMount mountPacket = new PacketPlayOutMount(by());
+	
+				for (Object obj : super.world.players) {
+					if (obj instanceof EntityPlayer) {
+						EntityPlayer nmsPlayer = (EntityPlayer) obj;
+	
+						double distanceSquared = Utils.square(nmsPlayer.locX - super.locX) + Utils.square(nmsPlayer.locZ - super.locZ);
+						if (distanceSquared < 1024 && nmsPlayer.playerConnection != null) {
+							nmsPlayer.playerConnection.sendPacket(mountPacket);
+						}
+					}
+				}
+			}
+		}
+		
+		if (!lockTick) {
+			super.m();
+		}
+	}
+	
+	@Override
+	public void b(NBTTagCompound nbttagcompound) {
+		// Do not save NBT.
+	}
+	
+	@Override
+	public boolean c(NBTTagCompound nbttagcompound) {
+		// Do not save NBT.
+		return false;
+	}
+
+	@Override
+	public boolean d(NBTTagCompound nbttagcompound) {
+		// Do not save NBT.
+		return false;
+	}
+	
+	@Override
+	public void e(NBTTagCompound nbttagcompound) {
+		// Do not save NBT.
+	}
+	
+	@Override
+	public void f(NBTTagCompound nbttagcompound) {
+		// Do not load NBT.
+	}
+	
+	@Override
+	public void a(NBTTagCompound nbttagcompound) {
+		// Do not load NBT.
+	}
+	
+	@Override
+	public boolean damageEntity(DamageSource damageSource, float amount) {
+		if (damageSource instanceof EntityDamageSource) {
+			EntityDamageSource entityDamageSource = (EntityDamageSource) damageSource;
+			if (entityDamageSource.getEntity() instanceof EntityPlayer) {
+				Bukkit.getPluginManager().callEvent(new PlayerInteractEntityEvent(((EntityPlayer) entityDamageSource.getEntity()).getBukkitEntity(), getBukkitEntity())); // Bukkit takes care of the exceptions
+			}
+		}
+		return false;
+	}
+	
+	@Override
+	public boolean isInvulnerable(DamageSource source) {
+		/*
+		 * The field Entity.invulnerable is private.
+		 * It's only used while saving NBTTags, but since the entity would be killed
+		 * on chunk unload, we prefer to override isInvulnerable().
+		 */
+	    return true;
+	}
+	
+	@Override
+	public boolean isCollidable() {
+		return false;
+	}
+
+	@Override
+	public void setCustomName(String customName) {
+		// Locks the custom name.
+	}
+	
+	@Override
+	public void setCustomNameVisible(boolean visible) {
+		// Locks the custom name.
+	}
+	
+	@Override
+	public void a(SoundEffect soundeffect, float f, float f1) {
+	    // Remove sounds.
+	}
+	
+	@Override
+	public void setLockTick(boolean lock) {
+		lockTick = lock;
+	}
+	
+	@Override
+	public void die() {
+		// Prevent being killed.
+	}
+	
+	@Override
+	public CraftEntity getBukkitEntity() {
+		if (super.bukkitEntity == null) {
+			super.bukkitEntity = new CraftNMSSlime(super.world.getServer(), this);
+	    }
+		return super.bukkitEntity;
+	}
+
+	@Override
+	public boolean isDeadNMS() {
+		return super.dead;
+	}
+	
+	@Override
+	public void killEntityNMS() {
+		super.dead = true;
+	}
+	
+	@Override
+	public void setLocationNMS(double x, double y, double z) {
+		super.setPosition(x, y, z);
+	}
+	
+	@Override
+	public int getIdNMS() {
+		return super.getId();
+	}
+	
+	@Override
+	public CraftHologramLine getHologramLine() {
+		return parentPiece;
+	}
+
+	@Override
+	public org.bukkit.entity.Entity getBukkitEntityNMS() {
+		return getBukkitEntity();
+	}
+	
+	@Override
+	public void setPassengerOfNMS(NMSEntityBase vehicleBase) {
+		if (vehicleBase == null || !(vehicleBase instanceof Entity)) {
+			// It should never dismount
+			return;
+		}
+		
+		Entity entity = (Entity) vehicleBase;
+		
+		try {
+			if (super.by() != null) {
+	        	Entity oldVehicle = super.by();
+	        	ReflectionUtils.setPrivateField(Entity.class, this, "as", null);
+	        	oldVehicle.passengers.remove(this);
+	        }
+
+	        ReflectionUtils.setPrivateField(Entity.class, this, "as", entity);
+	        entity.passengers.clear();
+	        entity.passengers.add(this);
+
+		} catch (Exception ex) {
+			DebugHandler.handleDebugException(ex);
+		}
+	}
+}

HolographicDisplays/Plugin/com/gmail/filoghost/holographicdisplays/nms/v1_9_R1/FancyMessageImpl.java

@@ -0,0 +1,170 @@
+package com.gmail.filoghost.holographicdisplays.nms.v1_9_R1;
+
+import java.io.IOException;
+import java.io.StringWriter;
+import java.util.ArrayList;
+import java.util.List;
+
+import net.minecraft.server.v1_9_R1.IChatBaseComponent;
+import net.minecraft.server.v1_9_R1.PacketPlayOutChat;
+
+import org.bukkit.ChatColor;
+
+import com.google.gson.stream.JsonWriter;
+
+import org.bukkit.craftbukkit.v1_9_R1.entity.CraftPlayer;
+import org.bukkit.entity.Player;
+
+import com.gmail.filoghost.holographicdisplays.nms.interfaces.FancyMessage;
+
+public class FancyMessageImpl implements FancyMessage {
+	
+	private List<MessagePart> messageParts;
+	
+	public FancyMessageImpl(String firstPartText) {
+		messageParts = new ArrayList<MessagePart>();
+		messageParts.add(new MessagePart(firstPartText));
+	}
+	
+	@Override
+	public FancyMessageImpl color(ChatColor color) {
+		if (!color.isColor()) {
+			throw new IllegalArgumentException(color.name() + " is not a color");
+		}
+		latest().color = color;
+		return this;
+	}
+	
+	@Override
+	public FancyMessageImpl style(ChatColor... styles) {
+		for (ChatColor style : styles) {
+			if (!style.isFormat()) {
+				throw new IllegalArgumentException(style.name() + " is not a style");
+			}
+		}
+		latest().styles = styles;
+		return this;
+	}
+	
+	@Override
+	public FancyMessageImpl file(String path) {
+		onClick("open_file", path);
+		return this;
+	}
+	
+	@Override
+	public FancyMessageImpl link(String url) {
+		onClick("open_url", url);
+		return this;
+	}
+	
+	@Override
+	public FancyMessageImpl suggest(String command) {
+		onClick("suggest_command", command);
+		return this;
+	}
+	
+	@Override
+	public FancyMessageImpl command(String command) {
+		onClick("run_command", command);
+		return this;
+	}
+	
+	@Override
+	public FancyMessageImpl tooltip(String text) {
+		onHover("show_text", text);
+		return this;
+	}
+
+	@Override
+	public FancyMessageImpl then(Object obj) {
+		messageParts.add(new MessagePart(obj.toString()));
+		return this;
+	}
+	
+	@Override
+	public String toJSONString() {
+		StringWriter stringWriter = new StringWriter();
+		JsonWriter json = new JsonWriter(stringWriter);
+		
+		try {
+			if (messageParts.size() == 1) {
+				latest().writeJson(json);
+			} else {
+				json.beginObject().name("text").value("").name("extra").beginArray();
+				for (MessagePart part : messageParts) {
+					part.writeJson(json);
+				}
+				json.endArray().endObject();
+			}
+			
+		} catch (IOException e) {
+			throw new RuntimeException("invalid message");
+		}
+		return stringWriter.toString();
+	}
+	
+	@Override
+	public void send(Player player) {
+		((CraftPlayer) player).getHandle().playerConnection.sendPacket(new PacketPlayOutChat(IChatBaseComponent.ChatSerializer.a(toJSONString())));
+	}
+	
+	private MessagePart latest() {
+		return messageParts.get(messageParts.size() - 1);
+	}
+	
+	private void onClick(String name, String data) {
+		MessagePart latest = latest();
+		latest.clickActionName = name;
+		latest.clickActionData = data;
+	}
+	
+	private void onHover(String name, String data) {
+		MessagePart latest = latest();
+		latest.hoverActionName = name;
+		latest.hoverActionData = data;
+	}
+	
+	static class MessagePart {
+
+		public ChatColor color = null;
+		public ChatColor[] styles = null;
+		public String clickActionName = null;
+		public String clickActionData = null;
+		public String hoverActionName = null;
+		public String hoverActionData = null;
+		public final String text;
+		
+		public MessagePart(final String text) {
+			this.text = text;
+		}
+		
+		public JsonWriter writeJson(final JsonWriter json) throws IOException {
+			json.beginObject().name("text").value(text);
+			if (color != null) {
+				json.name("color").value(color.name().toLowerCase());
+			}
+			if (styles != null) {
+				for (final ChatColor style : styles) {
+					json.name(style == ChatColor.UNDERLINE ? "underlined" : style.name().toLowerCase()).value(true);
+				}
+			}
+			if (clickActionName != null && clickActionData != null) {
+				json.name("clickEvent")
+					.beginObject()
+						.name("action").value(clickActionName)
+						.name("value").value(clickActionData)
+					.endObject();
+			}
+			if (hoverActionName != null && hoverActionData != null) {
+				json.name("hoverEvent")
+					.beginObject()
+						.name("action").value(hoverActionName)
+						.name("value").value(hoverActionData)
+					.endObject();
+			}
+			return json.endObject();
+		}
+		
+	}
+}

HolographicDisplays/Plugin/com/gmail/filoghost/holographicdisplays/nms/v1_9_R1/NmsManagerImpl.java

@@ -0,0 +1,152 @@
+package com.gmail.filoghost.holographicdisplays.nms.v1_9_R1;
+
+import java.lang.reflect.Method;
+
+import net.minecraft.server.v1_9_R1.Entity;
+import net.minecraft.server.v1_9_R1.EntityTypes;
+import net.minecraft.server.v1_9_R1.MathHelper;
+import net.minecraft.server.v1_9_R1.World;
+import net.minecraft.server.v1_9_R1.WorldServer;
+
+import org.apache.commons.lang.NotImplementedException;
+import org.bukkit.Bukkit;
+import org.bukkit.craftbukkit.v1_9_R1.CraftWorld;
+import org.bukkit.craftbukkit.v1_9_R1.entity.CraftEntity;
+import org.bukkit.inventory.ItemStack;
+
+import com.gmail.filoghost.holographicdisplays.nms.interfaces.FancyMessage;
+import com.gmail.filoghost.holographicdisplays.nms.interfaces.NMSManager;
+import com.gmail.filoghost.holographicdisplays.nms.interfaces.entity.NMSArmorStand;
+import com.gmail.filoghost.holographicdisplays.nms.interfaces.entity.NMSEntityBase;
+import com.gmail.filoghost.holographicdisplays.nms.interfaces.entity.NMSHorse;
+import com.gmail.filoghost.holographicdisplays.nms.interfaces.entity.NMSItem;
+import com.gmail.filoghost.holographicdisplays.nms.interfaces.entity.NMSWitherSkull;
+import com.gmail.filoghost.holographicdisplays.object.line.CraftHologramLine;
+import com.gmail.filoghost.holographicdisplays.object.line.CraftItemLine;
+import com.gmail.filoghost.holographicdisplays.object.line.CraftTouchSlimeLine;
+import com.gmail.filoghost.holographicdisplays.util.DebugHandler;
+import com.gmail.filoghost.holographicdisplays.util.ReflectionUtils;
+import com.gmail.filoghost.holographicdisplays.util.Validator;
+import com.gmail.filoghost.holographicdisplays.util.VersionUtils;
+
+public class NmsManagerImpl implements NMSManager {
+
+	private Method validateEntityMethod;
+	
+	@Override
+	public void setup() throws Exception {
+		registerCustomEntity(EntityNMSArmorStand.class, "ArmorStand", 30);
+		registerCustomEntity(EntityNMSItem.class, "Item", 1);
+		registerCustomEntity(EntityNMSSlime.class, "Slime", 55);
+		
+		validateEntityMethod = World.class.getDeclaredMethod("b", Entity.class);
+		validateEntityMethod.setAccessible(true);
+	}
+	
+	@SuppressWarnings("rawtypes")
+	public void registerCustomEntity(Class entityClass, String name, int id) throws Exception {
+		if (VersionUtils.isMCPCOrCauldron()) {
+			// MCPC+ / Cauldron entity registration.
+			throw new UnsupportedOperationException("MCPC, Cauldron and similar softwares are not supported");
+		} else {
+			// Normal entity registration.
+			ReflectionUtils.putInPrivateStaticMap(EntityTypes.class, "d", entityClass, name);
+			ReflectionUtils.putInPrivateStaticMap(EntityTypes.class, "f", entityClass, Integer.valueOf(id));
+		}
+	}
+	
+	@Override
+	public NMSHorse spawnNMSHorse(org.bukkit.World world, double x, double y, double z, CraftHologramLine parentPiece) {
+		throw new NotImplementedException("Method can only be used on 1.7 or lower");
+	}
+	
+	@Override
+	public NMSWitherSkull spawnNMSWitherSkull(org.bukkit.World bukkitWorld, double x, double y, double z, CraftHologramLine parentPiece) {
+		throw new NotImplementedException("Method can only be used on 1.7 or lower");
+	}
+	
+	@Override
+	public NMSItem spawnNMSItem(org.bukkit.World bukkitWorld, double x, double y, double z, CraftItemLine parentPiece, ItemStack stack) {
+		WorldServer nmsWorld = ((CraftWorld) bukkitWorld).getHandle();
+		EntityNMSItem customItem = new EntityNMSItem(nmsWorld, parentPiece);
+		customItem.setLocationNMS(x, y, z);
+		customItem.setItemStackNMS(stack);
+		if (!addEntityToWorld(nmsWorld, customItem)) {
+			DebugHandler.handleSpawnFail(parentPiece);
+		}
+		return customItem;
+	}
+	
+	@Override
+	public EntityNMSSlime spawnNMSSlime(org.bukkit.World bukkitWorld, double x, double y, double z, CraftTouchSlimeLine parentPiece) {
+		WorldServer nmsWorld = ((CraftWorld) bukkitWorld).getHandle();
+		EntityNMSSlime touchSlime = new EntityNMSSlime(nmsWorld, parentPiece);
+		touchSlime.setLocationNMS(x, y, z);
+		if (!addEntityToWorld(nmsWorld, touchSlime)) {
+			DebugHandler.handleSpawnFail(parentPiece);
+		}
+		return touchSlime;
+	}
+	
+	@Override
+	public NMSArmorStand spawnNMSArmorStand(org.bukkit.World world, double x, double y, double z, CraftHologramLine parentPiece) {
+		WorldServer nmsWorld = ((CraftWorld) world).getHandle();
+		EntityNMSArmorStand invisibleArmorStand = new EntityNMSArmorStand(nmsWorld, parentPiece);
+		invisibleArmorStand.setLocationNMS(x, y, z);
+		if (!addEntityToWorld(nmsWorld, invisibleArmorStand)) {
+			DebugHandler.handleSpawnFail(parentPiece);
+		}
+		return invisibleArmorStand;
+	}
+	
+	private boolean addEntityToWorld(WorldServer nmsWorld, Entity nmsEntity) {
+		Validator.isTrue(Bukkit.isPrimaryThread(), "Async entity add");
+		
+        final int chunkX = MathHelper.floor(nmsEntity.locX / 16.0);
+        final int chunkZ = MathHelper.floor(nmsEntity.locZ / 16.0);
+        
+        if (!nmsWorld.getChunkProviderServer().isChunkLoaded(chunkX, chunkZ)) {
+        	// This should never happen
+            nmsEntity.dead = true;
+            return false;
+        }
+        
+        nmsWorld.getChunkAt(chunkX, chunkZ).a(nmsEntity);
+        nmsWorld.entityList.add(nmsEntity);
+        
+        try {
+			validateEntityMethod.invoke(nmsWorld, nmsEntity);
+		} catch (Exception e) {
+			e.printStackTrace();
+			return false;
+		}
+        return true;
+    }
+	
+	@Override
+	public boolean isNMSEntityBase(org.bukkit.entity.Entity bukkitEntity) {
+		return ((CraftEntity) bukkitEntity).getHandle() instanceof NMSEntityBase;
+	}
+
+	@Override
+	public NMSEntityBase getNMSEntityBase(org.bukkit.entity.Entity bukkitEntity) {
+		
+		Entity nmsEntity = ((CraftEntity) bukkitEntity).getHandle();
+		if (nmsEntity instanceof NMSEntityBase) {
+			return ((NMSEntityBase) nmsEntity);
+		}
+
+		return null;
+	}
+
+	@Override
+	public FancyMessage newFancyMessage(String text) {
+		return new FancyMessageImpl(text);
+	}
+
+	@Override
+	public boolean hasChatHoverFeature() {
+		return true;
+	}
+	
+}

HolographicDisplays/Plugin/com/gmail/filoghost/holographicdisplays/nms/v1_9_R1/NullBoundingBox.java

@@ -0,0 +1,111 @@
+package com.gmail.filoghost.holographicdisplays.nms.v1_9_R1;
+
+import net.minecraft.server.v1_9_R1.AxisAlignedBB;
+import net.minecraft.server.v1_9_R1.BlockPosition;
+import net.minecraft.server.v1_9_R1.MovingObjectPosition;
+import net.minecraft.server.v1_9_R1.Vec3D;
+
+public class NullBoundingBox extends AxisAlignedBB {
+
+	public NullBoundingBox() {
+		super(0, 0, 0, 0, 0, 0);
+	}
+
+	@Override
+	public double a() {
+		return 0.0;
+	}
+
+	@Override
+	public double a(AxisAlignedBB arg0, double arg1) {
+		return 0.0;
+	}
+
+	@Override
+	public AxisAlignedBB a(AxisAlignedBB arg0) {
+		return this;
+	}
+
+	@Override
+	public AxisAlignedBB a(double arg0, double arg1, double arg2) {
+		return this;
+	}
+
+	@Override
+	public MovingObjectPosition a(Vec3D arg0, Vec3D arg1) {
+		return super.a(arg0, arg1);
+	}
+
+	@Override
+	public boolean a(Vec3D arg0) {
+		return false;
+	}
+
+	@Override
+	public double b(AxisAlignedBB arg0, double arg1) {
+		return 0.0;
+	}
+
+	@Override
+	public boolean b(AxisAlignedBB arg0) {
+		return false;
+	}
+
+	@Override
+	public double c(AxisAlignedBB arg0, double arg1) {
+		return 0.0;
+	}
+
+	@Override
+	public AxisAlignedBB c(double arg0, double arg1, double arg2) {
+		return this;
+	}
+
+	@Override
+	public AxisAlignedBB grow(double arg0, double arg1, double arg2) {
+		return this;
+	}
+
+	@Override
+	public AxisAlignedBB shrink(double arg0) {
+		return this;
+	}
+	
+	@Override
+	public AxisAlignedBB a(BlockPosition arg0) {
+		return this;
+	}
+
+	@Override
+	public boolean a(double arg0, double arg1, double arg2, double arg3, double arg4, double arg5) {
+		return false;
+	}
+
+	@Override
+	public boolean b(Vec3D arg0) {
+		return false;
+	}
+
+	@Override
+	public boolean c(Vec3D arg0) {
+		return false;
+	}
+
+	@Override
+	public boolean d(Vec3D arg0) {
+		return false;
+	}
+
+	@Override
+	public AxisAlignedBB e(double arg0) {
+		return this;
+	}
+	
+	@Override
+	public AxisAlignedBB g(double arg0) {
+		return this;
+	}
+
+	
+
+}

HolographicDisplays/Plugin/com/gmail/filoghost/holographicdisplays/object/CraftVisibilityManager.java

@@ -10,8 +10,9 @@ import org.bukkit.entity.Player;
 
 import com.gmail.filoghost.holographicdisplays.HolographicDisplays;
 import com.gmail.filoghost.holographicdisplays.api.VisibilityManager;
-import com.gmail.filoghost.holographicdisplays.bridge.protocollib.ProtocolLibHook;
+import com.gmail.filoghost.holographicdisplays.bridge.protocollib.pre1_9.ProtocolLibHook;
 import com.gmail.filoghost.holographicdisplays.util.Validator;
+import com.gmail.filoghost.holographicdisplays.util.VersionUtils;
 
 public class CraftVisibilityManager implements VisibilityManager {
 
@@ -32,7 +33,6 @@ public class CraftVisibilityManager implements VisibilityManager {
 		return visibleByDefault;
 	}
 	
-	@SuppressWarnings("deprecation")
 	@Override
 	public void setVisibleByDefault(boolean visibleByDefault) {
 		if (this.visibleByDefault != visibleByDefault) {
@@ -40,7 +40,7 @@ public class CraftVisibilityManager implements VisibilityManager {
 			boolean oldVisibleByDefault = this.visibleByDefault;
 			this.visibleByDefault = visibleByDefault;
 			
-			for (Player player : Bukkit.getOnlinePlayers()) {
+			for (Player player : VersionUtils.getOnlinePlayers()) {
 				
 				if (playersVisibilityMap != null && playersVisibilityMap.containsKey(player.getName().toLowerCase())) {
 					// Has a specific value set

HolographicDisplays/Plugin/com/gmail/filoghost/holographicdisplays/object/line/CraftItemLine.java

@@ -61,10 +61,12 @@ public class CraftItemLine extends CraftTouchableLine implements ItemLine {
 			
 			Location loc = nmsItem.getBukkitEntityNMS().getLocation();
 			
-			if (HolographicDisplays.is1_8()) {
+			if (HolographicDisplays.is19orGreater()) {
-				super.setTouchHandler(touchHandler, loc.getWorld(), loc.getX(), loc.getY() - Offsets.ARMOR_STAND_WITH_ITEM, loc.getZ());
+				super.setTouchHandler(touchHandler, loc.getWorld(), loc.getX(), loc.getY() - getItemOffset(), loc.getZ());
+			} else if (HolographicDisplays.is18orGreater()) {
+				super.setTouchHandler(touchHandler, loc.getWorld(), loc.getX(), loc.getY() - getItemOffset(), loc.getZ());
 			} else {
-				super.setTouchHandler(touchHandler, loc.getWorld(), loc.getX(), loc.getY() - Offsets.WITHER_SKULL_WITH_ITEM, loc.getZ());
+				super.setTouchHandler(touchHandler, loc.getWorld(), loc.getX(), loc.getY() - getItemOffset(), loc.getZ());
 			}
 			
 		} else {
@@ -78,11 +80,11 @@ public class CraftItemLine extends CraftTouchableLine implements ItemLine {
 		
 		if (itemStack != null && itemStack.getType() != Material.AIR) {
 			
-			double offset = HolographicDisplays.is1_8() ? Offsets.ARMOR_STAND_WITH_ITEM : Offsets.WITHER_SKULL_WITH_ITEM;
+			double offset = getItemOffset();
 			
 			nmsItem = HolographicDisplays.getNMSManager().spawnNMSItem(world, x, y + offset, z, this, itemStack);
 			
-			if (HolographicDisplays.is1_8()) {
+			if (HolographicDisplays.is18orGreater()) {
 				nmsVehicle = HolographicDisplays.getNMSManager().spawnNMSArmorStand(world, x, y + offset, z, this);
 			} else {
 				nmsVehicle = HolographicDisplays.getNMSManager().spawnNMSWitherSkull(world, x, y + offset, z, this);
@@ -115,7 +117,7 @@ public class CraftItemLine extends CraftTouchableLine implements ItemLine {
 	public void teleport(double x, double y, double z) {
 		super.teleport(x, y, z);
 		
-		double offset = HolographicDisplays.is1_8() ? Offsets.ARMOR_STAND_WITH_ITEM : Offsets.WITHER_SKULL_WITH_ITEM;
+		double offset = getItemOffset();
 		
 		if (nmsVehicle != null) {
 			nmsVehicle.setLocationNMS(x, y + offset, z);
@@ -146,6 +148,16 @@ public class CraftItemLine extends CraftTouchableLine implements ItemLine {
 	public NMSEntityBase getNmsVehicle() {
 		return nmsVehicle;
 	}
+	
+	private double getItemOffset() {
+		if (HolographicDisplays.is19orGreater()) {
+			return Offsets.ARMOR_STAND_WITH_ITEM_1_9;
+		} else if (HolographicDisplays.is18orGreater()) {
+			return Offsets.ARMOR_STAND_WITH_ITEM;
+		} else {
+			return Offsets.WITHER_SKULL_WITH_ITEM;
+		}
+	}
 
 	@Override
 	public String toString() {

HolographicDisplays/Plugin/com/gmail/filoghost/holographicdisplays/object/line/CraftTextLine.java

@@ -59,12 +59,7 @@ public class CraftTextLine extends CraftTouchableLine implements TextLine {
 		if (nmsNameble != null) {
 			
 			Location loc = nmsNameble.getBukkitEntityNMS().getLocation();
-			
+			super.setTouchHandler(touchHandler, loc.getWorld(), loc.getX(), loc.getY() - getTextOffset(), loc.getZ());
-			if (HolographicDisplays.is1_8()) {
-				super.setTouchHandler(touchHandler, loc.getWorld(), loc.getX(), loc.getY() - Offsets.ARMOR_STAND_ALONE, loc.getZ());
-			} else {
-				super.setTouchHandler(touchHandler, loc.getWorld(), loc.getX(), loc.getY() - Offsets.WITHER_SKULL_WITH_HORSE, loc.getZ());
-			}
 			
 		} else {
 			super.setTouchHandler(touchHandler, null, 0, 0, 0);
@@ -75,8 +70,8 @@ public class CraftTextLine extends CraftTouchableLine implements TextLine {
 	public void spawn(World world, double x, double y, double z) {
 		super.spawn(world, x, y, z);
 			
-		if (HolographicDisplays.is1_8()) {
+		if (HolographicDisplays.is18orGreater()) {
-			nmsNameble = HolographicDisplays.getNMSManager().spawnNMSArmorStand(world, x, y + Offsets.ARMOR_STAND_ALONE, z, this);
+			nmsNameble = HolographicDisplays.getNMSManager().spawnNMSArmorStand(world, x, y + getTextOffset(), z, this);
 		} else {
 			nmsNameble = HolographicDisplays.getNMSManager().spawnNMSHorse(world, x, y + Offsets.WITHER_SKULL_WITH_HORSE, z, this);
 			nmsSkullVehicle = HolographicDisplays.getNMSManager().spawnNMSWitherSkull(world, x, y + Offsets.WITHER_SKULL_WITH_HORSE, z, this);
@@ -119,7 +114,7 @@ public class CraftTextLine extends CraftTouchableLine implements TextLine {
 		}
 		
 		if (nmsNameble != null) {
-			nmsNameble.setLocationNMS(x, y + (HolographicDisplays.is1_8() ? Offsets.ARMOR_STAND_ALONE : Offsets.WITHER_SKULL_WITH_HORSE), z);
+			nmsNameble.setLocationNMS(x, y + getTextOffset(), z);
 		}
 	}
 	
@@ -152,6 +147,15 @@ public class CraftTextLine extends CraftTouchableLine implements TextLine {
 		return nmsSkullVehicle;
 	}
 
+	private double getTextOffset() {
+		if (HolographicDisplays.is19orGreater()) {
+			return Offsets.ARMOR_STAND_ALONE_1_9;
+		} else if (HolographicDisplays.is18orGreater()) {
+			return Offsets.ARMOR_STAND_ALONE;
+		} else {
+			return Offsets.WITHER_SKULL_WITH_HORSE;
+		}
+	}
 
 	@Override
 	public String toString() {

HolographicDisplays/Plugin/com/gmail/filoghost/holographicdisplays/object/line/CraftTouchSlimeLine.java

@@ -34,11 +34,11 @@ public class CraftTouchSlimeLine extends CraftHologramLine {
 	public void spawn(World world, double x, double y, double z) {
 		super.spawn(world, x, y, z);
 		
-		double offset = HolographicDisplays.is1_8() ? Offsets.ARMOR_STAND_WITH_SLIME : Offsets.WITHER_SKULL_WITH_SLIME;
+		double offset = getSlimeOffset();
 		
 		nmsSlime = HolographicDisplays.getNMSManager().spawnNMSSlime(world, x, y + offset, z, this);
 		
-		if (HolographicDisplays.is1_8()) {
+		if (HolographicDisplays.is18orGreater()) {
 			nmsVehicle = HolographicDisplays.getNMSManager().spawnNMSArmorStand(world, x, y + offset, z, this);
 		} else {
 			nmsVehicle = HolographicDisplays.getNMSManager().spawnNMSWitherSkull(world, x, y + offset, z, this);
@@ -70,7 +70,7 @@ public class CraftTouchSlimeLine extends CraftHologramLine {
 	@Override
 	public void teleport(double x, double y, double z) {
 		
-		double offset = HolographicDisplays.is1_8() ? Offsets.ARMOR_STAND_WITH_SLIME : Offsets.WITHER_SKULL_WITH_SLIME;
+		double offset = getSlimeOffset();
 		
 		if (nmsVehicle != null) {
 			nmsVehicle.setLocationNMS(x, y + offset, z);
@@ -97,6 +97,16 @@ public class CraftTouchSlimeLine extends CraftHologramLine {
 	public NMSEntityBase getNmsVehicle() {
 		return nmsVehicle;
 	}
+	
+	private double getSlimeOffset() {
+		if (HolographicDisplays.is19orGreater()) {
+			return Offsets.ARMOR_STAND_WITH_SLIME_1_9;
+		} else if (HolographicDisplays.is18orGreater()) {
+			return Offsets.ARMOR_STAND_WITH_SLIME;
+		} else {
+			return Offsets.WITHER_SKULL_WITH_SLIME;
+		}
+	}
 
 	@Override
 	public String toString() {

HolographicDisplays/Plugin/com/gmail/filoghost/holographicdisplays/placeholder/PlaceholdersRegister.java

@@ -12,6 +12,7 @@ import com.gmail.filoghost.holographicdisplays.HolographicDisplays;
 import com.gmail.filoghost.holographicdisplays.api.placeholder.PlaceholderReplacer;
 import com.gmail.filoghost.holographicdisplays.disk.Configuration;
 import com.gmail.filoghost.holographicdisplays.util.Utils;
+import com.gmail.filoghost.holographicdisplays.util.VersionUtils;
 
 public class PlaceholdersRegister {
 	
@@ -22,10 +23,9 @@ public class PlaceholdersRegister {
 		
 		register(new Placeholder(HolographicDisplays.getInstance(), "{online}", 1.0, new PlaceholderReplacer() {
 			
-			@SuppressWarnings("deprecation")
 			@Override
 			public String update() {
-				return String.valueOf(Bukkit.getOnlinePlayers().length);
+				return String.valueOf(VersionUtils.getOnlinePlayers().size());
 			}
 		}));
 		

HolographicDisplays/Plugin/com/gmail/filoghost/holographicdisplays/util/Offsets.java

@@ -18,6 +18,16 @@ public class Offsets {
 		ARMOR_STAND_WITH_ITEM = -1.48,
 	
 		// For 1.8+, an armor stand holding a slime.
-		ARMOR_STAND_WITH_SLIME = -1.49;
+		ARMOR_STAND_WITH_SLIME = -1.49,
+	
+	
+		// For 1.9+, a single armor stand. As with wither skulls and horses, the bottom part of the nametag should be on the surface of the block.
+		ARMOR_STAND_ALONE_1_9 = -0.29,
+		
+		// For 1.9+, an armor stand holding an item.
+		ARMOR_STAND_WITH_ITEM_1_9 = -0.0,
+	
+		// For 1.9+, an armor stand holding a slime.
+		ARMOR_STAND_WITH_SLIME_1_9 = -0.01;
 
 }

HolographicDisplays/Plugin/com/gmail/filoghost/holographicdisplays/util/ReflectionUtils.java

@@ -18,4 +18,10 @@ public class ReflectionUtils {
 		field.setAccessible(true);
 		field.set(handle, value);
 	}
+	
+	public static Object getPrivateField(Class<?> clazz, Object handle, String fieldName) throws Exception {
+		Field field = clazz.getDeclaredField(fieldName);
+		field.setAccessible(true);
+		return field.get(handle);
+	}
 }

HolographicDisplays/Plugin/com/gmail/filoghost/holographicdisplays/util/VersionUtils.java

@@ -1,15 +1,22 @@
 package com.gmail.filoghost.holographicdisplays.util;
 
+import java.lang.reflect.Method;
+import java.util.Collection;
+import java.util.Collections;
 import java.util.regex.Matcher;
 import java.util.regex.Pattern;
 
 import org.bukkit.Bukkit;
 import org.bukkit.entity.EntityType;
+import org.bukkit.entity.Player;
 
 import com.gmail.filoghost.holographicdisplays.HolographicDisplays;
+import com.google.common.collect.ImmutableList;
 
 public class VersionUtils {
 	
+	private static Method oldGetOnlinePlayersMethod;
+	
 	/**
 	 * This method uses a regex to get the NMS package part that changes with every update.
 	 * Example: v1_8_R1
@@ -47,10 +54,29 @@ public class VersionUtils {
 	}
 	
 	public static boolean isArmorstand(EntityType type) {
-		if (!HolographicDisplays.is1_8()) {
+		if (!HolographicDisplays.is18orGreater()) {
 			return false;
 		}
 		
 		return type == EntityType.ARMOR_STAND;
 	}
+	
+	
+	public static Collection<? extends Player> getOnlinePlayers() {
+		if (HolographicDisplays.is18orGreater()) {
+			return Bukkit.getOnlinePlayers();
+		} else {
+			try {
+				if (oldGetOnlinePlayersMethod == null) {
+					oldGetOnlinePlayersMethod = Bukkit.class.getDeclaredMethod("getOnlinePlayers");
+				}
+				
+				Player[] playersArray = (Player[]) oldGetOnlinePlayersMethod.invoke(null);
+				return ImmutableList.copyOf(playersArray);
+			} catch (Exception e) {
+				e.printStackTrace();
+				return Collections.emptyList();
+			}
+		}
+	}
 }

HolographicDisplays/plugin.yml

@@ -1,6 +1,6 @@
 name: HolographicDisplays
 main: com.gmail.filoghost.holographicdisplays.HolographicDisplays
-version: 2.1.10
+version: 2.1.11
 
 softdepend: [Multiverse-Core, MultiWorld, My Worlds, My_Worlds, ProtocolLib]
 

README.md

@@ -3,6 +3,4 @@ HolographicDisplays
 
 Bukkit Dev Page: http://dev.bukkit.org/bukkit-plugins/holographic-displays
 
-API tutorial: https://github.com/filoghost/HolographicDisplays/wiki
+API tutorial: https://github.com/filoghost/HolographicDisplays/wiki
-
-Old source (deprecated): https://github.com/filoghost/HolographicDisplays/tree/1.x