Compile against Spigot 1.8 API. Provide inhouse getOnlinePlayers method using reflection as a fallback. Fixes #192.

pom.xml

@@ -40,9 +40,9 @@
 	
 	<dependencies>
 		<dependency>
-			<groupId>org.bukkit</groupId>
-			<artifactId>bukkit</artifactId>
-			<version>1.7.9-R0.2</version>
+			<groupId>org.spigotmc</groupId>
+			<artifactId>spigot-api</artifactId>
+			<version>1.8-R0.1-SNAPSHOT</version>
 		</dependency>
 		<dependency>
 			<groupId>net.milkbowl.vault</groupId>
@@ -52,10 +52,6 @@
 	</dependencies>
 	
 	<repositories>
-		<repository>
-			 <id>bukkit-repo</id>
-			 <url>http://repo.bukkit.org/content/groups/public/</url>
-		</repository>
 		<repository>
 			<id>vault-repo</id>
 			<url>http://nexus.theyeticave.net/content/repositories/pub_releases</url>

src/main/java/com/massivecraft/massivecore/MetricsLite.java

@@ -35,6 +35,8 @@ import org.bukkit.plugin.Plugin;
 import org.bukkit.plugin.PluginDescriptionFile;
 import org.bukkit.scheduler.BukkitTask;
 
+import com.massivecraft.massivecore.util.MUtil;
+
 import java.io.BufferedReader;
 import java.io.ByteArrayOutputStream;
 import java.io.File;
@@ -284,7 +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 = MUtil.getOnlinePlayers().size();
 
         // END server software specific section -- all code below does not use any code outside of this class / Java
 

src/main/java/com/massivecraft/massivecore/particleeffect/ParticleEffect.java

@@ -9,13 +9,13 @@ import java.util.List;
 import java.util.Map;
 import java.util.Map.Entry;
 
-import org.bukkit.Bukkit;
 import org.bukkit.Location;
 import org.bukkit.Material;
 import org.bukkit.entity.Player;
 
 import com.massivecraft.massivecore.particleeffect.ReflectionUtils.PackageType;
 import com.massivecraft.massivecore.particleeffect.ReflectionUtils.PacketType;
+import com.massivecraft.massivecore.util.MUtil;
 
 /**
  * <b>ParticleEffect Library</b>
@@ -721,7 +721,7 @@ public enum ParticleEffect {
 			}
 			String worldName = center.getWorld().getName();
 			double squared = range * range;
-			for (Player player : Bukkit.getOnlinePlayers()) {
+			for (Player player : MUtil.getOnlinePlayers()) {
 				if (!player.getWorld().getName().equals(worldName) || player.getLocation().distanceSquared(center) > squared) {
 					continue;
 				}

src/main/java/com/massivecraft/massivecore/util/IdUtil.java

@@ -2,7 +2,6 @@ package com.massivecraft.massivecore.util;
 
 import java.io.File;
 import java.lang.reflect.Type;
-import java.util.Arrays;
 import java.util.Collection;
 import java.util.Collections;
 import java.util.HashSet;
@@ -181,7 +180,7 @@ public class IdUtil implements Listener, Runnable
 		Set<CommandSender> ret = new LinkedHashSet<CommandSender>();
 		
 		// Add Online Players
-		ret.addAll(Arrays.asList(Bukkit.getOnlinePlayers()));
+		ret.addAll(MUtil.getOnlinePlayers());
 		
 		// Add Console
 		ret.add(getConsole());
@@ -479,7 +478,6 @@ public class IdUtil implements Listener, Runnable
 		return getAsPlayer(getSender(senderObject));
 	}
 	
-	@SuppressWarnings("deprecation")
 	public static CommandSender getSender(Object senderObject)
 	{
 		// Null Return
@@ -875,7 +873,7 @@ public class IdUtil implements Listener, Runnable
 		
 		long millis = System.currentTimeMillis();
 		
-		for (Player player : Bukkit.getOnlinePlayers())
+		for (Player player : MUtil.getOnlinePlayers())
 		{
 			String id = getId(player);
 			if (id == null) throw new NullPointerException("id");

src/main/java/com/massivecraft/massivecore/util/InventoryUtil.java

@@ -24,7 +24,6 @@ public class InventoryUtil
 	// UPDATES
 	// -------------------------------------------- //
 	
-	@SuppressWarnings("deprecation")
 	public static void update(HumanEntity human)
 	{
 		if (!(human instanceof Player)) return;

src/main/java/com/massivecraft/massivecore/util/MUtil.java

@@ -2,6 +2,7 @@ package com.massivecraft.massivecore.util;
 
 import java.io.PrintWriter;
 import java.io.StringWriter;
+import java.lang.reflect.Method;
 import java.net.InetSocketAddress;
 import java.util.ArrayList;
 import java.util.Arrays;
@@ -22,6 +23,7 @@ import java.util.Set;
 import java.util.SortedSet;
 import java.util.TreeSet;
 
+import org.bukkit.Bukkit;
 import org.bukkit.ChatColor;
 import org.bukkit.Location;
 import org.bukkit.Material;
@@ -67,6 +69,101 @@ import com.massivecraft.massivecore.util.extractor.ExtractorWorldName;
 
 public class MUtil
 {
+	// -------------------------------------------- //
+	// CONSTANTS
+	// -------------------------------------------- //
+	
+	private static Method methodGetOnlinePlayers;
+	
+	static
+	{
+		methodGetOnlinePlayers = getMethodGetOnlinePlayers();
+	}
+	
+	// -------------------------------------------- //
+	// GET ONLINE PLAYERS
+	// -------------------------------------------- //
+	// It seems we can not always trust the Bukkit.getOnlinePlayers() method.
+	// Due to compilation issue this method might not exist in the form we compiled against.
+	// Spigot 1.8 and the 1.7 Bukkit might have been compiled slightly differently resulting in this issue.
+	// Issue Example: https://github.com/MassiveCraft/MassiveCore/issues/192
+	
+	public static Method getMethodGetOnlinePlayers()
+	{
+		Method ret = null;
+		
+		try
+		{
+			for (Method method : Bukkit.class.getDeclaredMethods())
+			{
+				// The method name must be getOnlinePlayers ...
+				if ( ! method.getName().equals("getOnlinePlayers")) continue;
+				
+				// ... if we find such a method it's better than nothing ...
+				if (ret == null) ret = method;
+				
+				// ... but if the method additionally returns a collection ...
+				if ( ! method.getReturnType().isAssignableFrom(Collection.class)) continue;
+				
+				// ... that is preferable ...
+				ret = method;
+				
+				// ... and we need not look any further.
+				break;
+			}
+			
+			ret.setAccessible(true);
+		}
+		catch (Exception e)
+		{
+			// If we fail we do so silently.
+			// This method is probably almost never going to be used anyways.
+		}
+		
+		return ret;
+	}
+	
+	public static Collection<? extends Player> getOnlinePlayers()
+	{
+		try
+		{
+			return Bukkit.getOnlinePlayers();
+		}
+		catch (Exception e)
+		{
+			// We probably just caught a NoSuchMethodError.
+		}
+		
+		try
+		{
+			Object playersObject = methodGetOnlinePlayers.invoke(null);
+			if (playersObject instanceof Player[])
+			{
+				System.out.println(1);
+				Player[] playersArray = (Player[])playersObject;
+				return Arrays.asList(playersArray);
+			}
+			else if (playersObject instanceof Collection<?>)
+			{
+				System.out.println(2);
+				@SuppressWarnings("unchecked")
+				Collection<? extends Player> playersCollection = (Collection<? extends Player>)playersObject;
+				return playersCollection;
+			}
+			else
+			{
+				System.out.println(3);
+				throw new RuntimeException("Unknown return type for getOnlinePlayers using reflection.");
+			}
+		}
+		catch (Exception e)
+		{
+			e.printStackTrace();
+		}
+		
+		return null;
+	}
+	
 	// -------------------------------------------- //
 	// IS VALID PLAYER NAME
 	// -------------------------------------------- //

src/main/java/com/massivecraft/massivecore/util/PlayerUtil.java

@@ -54,7 +54,7 @@ public class PlayerUtil extends EngineAbstract
 		idToArmSwingEvent.clear();
 		
 		joinedPlayerIds.clear();
-		for (Player player : Bukkit.getOnlinePlayers())
+		for (Player player : MUtil.getOnlinePlayers())
 		{
 			joinedPlayerIds.add(player.getUniqueId());
 		}