Provide embedded capability

SpigotCore_Main/src/de/steamwar/core/Core.java

@@ -39,11 +39,9 @@ import java.util.logging.Level;
 
 public class Core extends JavaPlugin{
 
+	public static final Message MESSAGE = new Message("SpigotCore", Core.class.getClassLoader());
+
 	private static final int VERSION;
-	public static final Message MESSAGE;
-
-	private static Core instance;
-
 	static{
 		String packageName = Bukkit.getServer().getClass().getPackage().getName();
 		if(packageName.contains("1_18"))
@@ -62,13 +60,30 @@ public class Core extends JavaPlugin{
 			VERSION = 8;
 		else
 			VERSION = 18;
+	}
+	public static int getVersion(){
+		return VERSION;
+	}
 
-		MESSAGE = new Message("SpigotCore", Core.class.getClassLoader());
+	private static JavaPlugin instance;
+	public static JavaPlugin getInstance() {
+		return instance;
+	}
+	public static void setInstance(JavaPlugin instance) {
+		Core.instance = instance;
+	}
+
+	private static boolean standalone = true;
+	public static boolean standalone() {
+		return standalone;
+	}
+
+	private static File sqlConfig;
+	public static File sqlConfig() {
+		return sqlConfig;
 	}
 
 	private ErrorHandler errorHandler;
-	private File sqlConfig;
-	private boolean standalone;
 
 	@Override
 	public void onLoad() {
@@ -77,8 +92,7 @@ public class Core extends JavaPlugin{
 	
 	@Override
 	public void onEnable() {
-		sqlConfig = new File(Core.getInstance().getDataFolder(), "MySQL.yml");
-		standalone = !sqlConfig.exists();
+		setSqlConfig();
 		errorHandler = new ErrorHandler();
 
 		Bukkit.getPluginManager().registerEvents(new PlayerJoinedEvent(), this);
@@ -99,26 +113,13 @@ public class Core extends JavaPlugin{
 	public void onDisable() {
 		TinyProtocol.instance.close();
 		errorHandler.unregister();
-		Statement.close();
+		if(!standalone) {
+			Statement.close();
+		}
 	}
 
-	public static File sqlConfig() {
-		return instance.sqlConfig;
-	}
-
-	public static boolean standalone() {
-		return instance.standalone;
-	}
-
-	public static Core getInstance() {
-		return instance;
-	}
-
-	public static int getVersion(){
-		return VERSION;
-	}
-
-	private static void setInstance(Core instance) {
-		Core.instance = instance;
+	private static void setSqlConfig() {
+		sqlConfig = new File(Core.getInstance().getDataFolder(), "MySQL.yml");
+		standalone = !sqlConfig.exists();
 	}
 }