Added that fancy message when 1.9 clients try to enter a Minecart :)

src/main/java/us/myles/ViaVersion/ViaVersionPlugin.java

@@ -16,6 +16,7 @@ import org.bukkit.plugin.java.JavaPlugin;
 import us.myles.ViaVersion.api.ViaVersion;
 import us.myles.ViaVersion.api.ViaVersionAPI;
 import us.myles.ViaVersion.handlers.ViaVersionInitializer;
+import us.myles.ViaVersion.listeners.MinecartListener;
 import us.myles.ViaVersion.util.ReflectionUtil;
 
 import java.util.Collections;
@@ -52,6 +53,7 @@ public class ViaVersionPlugin extends JavaPlugin implements ViaVersionAPI {
                 setPorted(e.getPlayer().getUniqueId(), false);
             }
         }, this);
+        Bukkit.getPluginManager().registerEvents(new MinecartListener(),this);
     }
 
     public void injectPacketHandler() throws Exception {

src/main/java/us/myles/ViaVersion/listeners/MinecartListener.java

@@ -0,0 +1,25 @@
+package us.myles.ViaVersion.listeners;
+
+import org.bukkit.ChatColor;
+import org.bukkit.entity.Player;
+import org.bukkit.event.EventHandler;
+import org.bukkit.event.Listener;
+import org.bukkit.event.vehicle.VehicleEnterEvent;
+import us.myles.ViaVersion.api.ViaVersion;
+
+/**
+ * Created by fillefilip8 on 2016-03-02.
+ */
+public class MinecartListener implements Listener {
+    @EventHandler
+    public void onMinecartEnter(VehicleEnterEvent e){
+        if(e.getEntered() instanceof Player) {
+            Player player = (Player) e.getEntered();
+            if(ViaVersion.getInstance().isPorted(player)){
+                e.setCancelled(true);
+                e.getEntered().sendMessage(ChatColor.RED + "Minecarts are not supported. Due to changes on minecarts in 1.9");
+            }
+        }
+
+    }
+}