Fix the 0 tps issue

src/es/mesacarlos/webconsole/WebConsole.java

@@ -9,6 +9,7 @@
 import javax.net.ssl.SSLContext;
 import javax.net.ssl.TrustManagerFactory;
 
+import es.mesacarlos.webconsole.util.TpsTracker;
 import org.apache.logging.log4j.LogManager;
 import org.apache.logging.log4j.core.Filter;
 import org.bukkit.Bukkit;
@@ -28,6 +29,7 @@ public class WebConsole extends JavaPlugin {
 
 	@Override
 	public void onEnable() {
+		Bukkit.getServer().getScheduler().scheduleSyncRepeatingTask(this, new TpsTracker(), 100L, 1L);
 		//Change language to user-specified language.
 		Internationalization.setCurrentLocale(ConfigManager.getInstance().getLanguage());
 
@@ -100,4 +102,4 @@ public void run() {
 	public WSServer getWSServer() {
 		return server;
 	}
-}
+}

src/es/mesacarlos/webconsole/util/TpsTracker.java

@@ -0,0 +1,34 @@
+package es.mesacarlos.webconsole.util;
+
+public class TpsTracker implements Runnable {
+    public static int TICK_COUNT = 0;
+    public static long[] TICKS = new long[600];
+    public static long LAST_TICK = 0L;
+
+    public static double getTPS() {
+        return getTPS(100);
+    }
+
+    public static double getTPS(int ticks) {
+        if (TICK_COUNT < ticks) {
+            return 20.0;
+        } else {
+            int target = (TICK_COUNT - 1 - ticks) % TICKS.length;
+            long elapsed = System.currentTimeMillis() - TICKS[target];
+            return (double)ticks / ((double)elapsed / 1000.0);
+        }
+    }
+
+    public static long getElapsed(int tickID) {
+        if (TICK_COUNT - tickID >= TICKS.length) {
+        }
+
+        long time = TICKS[tickID % TICKS.length];
+        return System.currentTimeMillis() - time;
+    }
+
+    public void run() {
+        TICKS[TICK_COUNT % TICKS.length] = System.currentTimeMillis();
+        ++TICK_COUNT;
+    }
+}

src/es/mesacarlos/webconsole/websocket/command/TpsCommand.java

@@ -9,6 +9,7 @@
 //------------------------------
 
 import es.mesacarlos.webconsole.util.Internationalization;
+import es.mesacarlos.webconsole.util.TpsTracker;
 import es.mesacarlos.webconsole.websocket.WSServer;
 import es.mesacarlos.webconsole.websocket.response.Tps;
 import org.java_websocket.WebSocket;
@@ -35,20 +36,7 @@ public void execute(WSServer wsServer, WebSocket conn, String params) {
 	 * @return Current server Tps
 	 */
 	public double[] getTps() throws ClassNotFoundException, NoSuchMethodException, InvocationTargetException, IllegalAccessException, NoSuchFieldException {
-		try {
-			Class<?> minecraftServerClass = Class.forName("net.minecraft.server." + mcVer + ".MinecraftServer");
-			Method getServerMethod = minecraftServerClass.getDeclaredMethod("getServer");
-			Object serverInstance = getServerMethod.invoke(null);
-			Field recentTpsField = serverInstance.getClass().getField("recentTps");
-			double[] recentTps = (double[]) recentTpsField.get(serverInstance);
-			for (int i = 0; i < recentTps.length; i++) {
-				recentTps[i] = Math.round(recentTps[i]);
-			}
-			return recentTps;
-		} catch (Exception e) {
-			//If an uncaught exception is thrown, maybe it is because this method of getting TPS does not work in the MV version currently running..
-			return new double[] { 0 };
-		}
+		return new double[] { Math.round(TpsTracker.getTPS()) }; // rounding elsewe would get something like 19.93620414673046 / 20 tps
 	}
 
 }