Merge pull request Grasscutters#580 from Bwly999/development

Fix the problem that the reference of serverHook in Plugin object is null

src/main/java/emu/grasscutter/Grasscutter.java

@@ -96,14 +96,13 @@ public static void main(String[] args) throws Exception {
 		// Database
 		DatabaseManager.initialize();
 
-		// Create plugin manager instance.
-		pluginManager = new PluginManager();
-
 		// Create server instances.
 		dispatchServer = new DispatchServer();
 		gameServer = new GameServer();
 		// Create a server hook instance with both servers.
 		new ServerHook(gameServer, dispatchServer);
+		// Create plugin manager instance.
+		pluginManager = new PluginManager();
 
 		// Start servers.
 		if (getConfig().RunMode == ServerRunMode.HYBRID) {

src/main/java/emu/grasscutter/server/game/GameServer.java

@@ -29,6 +29,9 @@
 import java.time.OffsetDateTime;
 import java.util.*;
 import java.util.concurrent.ConcurrentHashMap;
+import java.util.concurrent.Executors;
+import java.util.concurrent.ScheduledExecutorService;
+import java.util.concurrent.TimeUnit;
 
 import static emu.grasscutter.utils.Language.translate;
 
@@ -79,19 +82,6 @@ public GameServer(InetSocketAddress address) {
 		this.dropManager = new DropManager(this);
 		this.expeditionManager = new ExpeditionManager(this);
 		this.combineManger = new CombineManger(this);
-
-		// Schedule game loop.
-		Timer gameLoop = new Timer();
-		gameLoop.scheduleAtFixedRate(new TimerTask() {
-			@Override
-			public void run() {
-				try {
-					onTick();
-				} catch (Exception e) {
-					Grasscutter.getLogger().error(translate("messages.game.game_update_error"), e);
-				}
-			}
-		}, new Date(), 1000L);
 
 		// Hook into shutdown event.
 		Runtime.getRuntime().addShutdownHook(new Thread(this::onServerShutdown));
@@ -229,6 +219,24 @@ public void deregisterWorld(World world) {
 
 	}
 
+	@Override
+	public synchronized void start() {
+		// Schedule game loop.
+		Timer gameLoop = new Timer();
+		gameLoop.scheduleAtFixedRate(new TimerTask() {
+			@Override
+			public void run() {
+				try {
+					onTick();
+				} catch (Exception e) {
+					Grasscutter.getLogger().error(translate("messages.game.game_update_error"), e);
+				}
+			}
+		}, new Date(), 1000L);
+
+		super.start();
+	}
+
 	@Override
 	public void onStartFinish() {
 		Grasscutter.getLogger().info(translate("messages.status.free_software"));