weird java.lang.InstantiationException when registering EventHandler

[blooditor]

Hey,

 

I got a weird java.lang.InstantiationException whenever I register my EventHandler class in the preInit method. The events still get called so everything works fine - there is just the error message in the console every time:

 

Spoiler

(3x:)

 java.lang.InstantiationException
[01:38:57] [Server thread/INFO] [STDERR]: [java.lang.Throwable$WrappedPrintStream:println:-1]:     at sun.reflect.InstantiationExceptionConstructorAccessorImpl.newInstance(Unknown Source)
[01:38:57] [Server thread/INFO] [STDERR]: [java.lang.Throwable$WrappedPrintStream:println:-1]:     at java.lang.reflect.Constructor.newInstance(Unknown Source)
[01:38:57] [Server thread/INFO] [STDERR]: [java.lang.Throwable$WrappedPrintStream:println:-1]:     at net.minecraftforge.fml.common.eventhandler.EventBus.register(EventBus.java:103)
[01:38:57] [Server thread/INFO] [STDERR]: [java.lang.Throwable$WrappedPrintStream:println:-1]:     at net.minecraftforge.fml.common.eventhandler.EventBus.register(EventBus.java:85)
[01:38:57] [Server thread/INFO] [STDERR]: [java.lang.Throwable$WrappedPrintStream:println:-1]:     at com.mcb.server.MainClass.preInit(MainClass.java:93)
[01:38:57] [Server thread/INFO] [STDERR]: [java.lang.Throwable$WrappedPrintStream:println:-1]:     at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
[01:38:57] [Server thread/INFO] [STDERR]: [java.lang.Throwable$WrappedPrintStream:println:-1]:     at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
[01:38:57] [Server thread/INFO] [STDERR]: [java.lang.Throwable$WrappedPrintStream:println:-1]:     at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
[01:38:57] [Server thread/INFO] [STDERR]: [java.lang.Throwable$WrappedPrintStream:println:-1]:     at java.lang.reflect.Method.invoke(Unknown Source)
[01:38:57] [Server thread/INFO] [STDERR]: [java.lang.Throwable$WrappedPrintStream:println:-1]:     at net.minecraftforge.fml.common.FMLModContainer.handleModStateEvent(FMLModContainer.java:553)
[01:38:57] [Server thread/INFO] [STDERR]: [java.lang.Throwable$WrappedPrintStream:println:-1]:     at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
[01:38:57] [Server thread/INFO] [STDERR]: [java.lang.Throwable$WrappedPrintStream:println:-1]:     at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
[01:38:57] [Server thread/INFO] [STDERR]: [java.lang.Throwable$WrappedPrintStream:println:-1]:     at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
[01:38:57] [Server thread/INFO] [STDERR]: [java.lang.Throwable$WrappedPrintStream:println:-1]:     at java.lang.reflect.Method.invoke(Unknown Source)
[01:38:57] [Server thread/INFO] [STDERR]: [java.lang.Throwable$WrappedPrintStream:println:-1]:     at com.google.common.eventbus.EventSubscriber.handleEvent(EventSubscriber.java:74)
[01:38:57] [Server thread/INFO] [STDERR]: [java.lang.Throwable$WrappedPrintStream:println:-1]:     at com.google.common.eventbus.SynchronizedEventSubscriber.handleEvent(SynchronizedEventSubscriber.java:47)
[01:38:57] [Server thread/INFO] [STDERR]: [java.lang.Throwable$WrappedPrintStream:println:-1]:     at com.google.common.eventbus.EventBus.dispatch(EventBus.java:322)
[01:38:57] [Server thread/INFO] [STDERR]: [java.lang.Throwable$WrappedPrintStream:println:-1]:     at com.google.common.eventbus.EventBus.dispatchQueuedEvents(EventBus.java:304)
[01:38:57] [Server thread/INFO] [STDERR]: [java.lang.Throwable$WrappedPrintStream:println:-1]:     at com.google.common.eventbus.EventBus.post(EventBus.java:275)
[01:38:57] [Server thread/INFO] [STDERR]: [java.lang.Throwable$WrappedPrintStream:println:-1]:     at net.minecraftforge.fml.common.LoadController.sendEventToModContainer(LoadController.java:212)
[01:38:57] [Server thread/INFO] [STDERR]: [java.lang.Throwable$WrappedPrintStream:println:-1]:     at net.minecraftforge.fml.common.LoadController.propogateStateMessage(LoadController.java:190)
[01:38:57] [Server thread/INFO] [STDERR]: [java.lang.Throwable$WrappedPrintStream:println:-1]:     at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
[01:38:57] [Server thread/INFO] [STDERR]: [java.lang.Throwable$WrappedPrintStream:println:-1]:     at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
[01:38:57] [Server thread/INFO] [STDERR]: [java.lang.Throwable$WrappedPrintStream:println:-1]:     at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
[01:38:57] [Server thread/INFO] [STDERR]: [java.lang.Throwable$WrappedPrintStream:println:-1]:     at java.lang.reflect.Method.invoke(Unknown Source)
[01:38:57] [Server thread/INFO] [STDERR]: [java.lang.Throwable$WrappedPrintStream:println:-1]:     at com.google.common.eventbus.EventSubscriber.handleEvent(EventSubscriber.java:74)
[01:38:57] [Server thread/INFO] [STDERR]: [java.lang.Throwable$WrappedPrintStream:println:-1]:     at com.google.common.eventbus.SynchronizedEventSubscriber.handleEvent(SynchronizedEventSubscriber.java:47)
[01:38:57] [Server thread/INFO] [STDERR]: [java.lang.Throwable$WrappedPrintStream:println:-1]:     at com.google.common.eventbus.EventBus.dispatch(EventBus.java:322)
[01:38:57] [Server thread/INFO] [STDERR]: [java.lang.Throwable$WrappedPrintStream:println:-1]:     at com.google.common.eventbus.EventBus.dispatchQueuedEvents(EventBus.java:304)
[01:38:57] [Server thread/INFO] [STDERR]: [java.lang.Throwable$WrappedPrintStream:println:-1]:     at com.google.common.eventbus.EventBus.post(EventBus.java:275)
[01:38:57] [Server thread/INFO] [STDERR]: [java.lang.Throwable$WrappedPrintStream:println:-1]:     at net.minecraftforge.fml.common.LoadController.distributeStateMessage(LoadController.java:119)
[01:38:57] [Server thread/INFO] [STDERR]: [java.lang.Throwable$WrappedPrintStream:println:-1]:     at net.minecraftforge.fml.common.Loader.preinitializeMods(Loader.java:550)
[01:38:57] [Server thread/INFO] [STDERR]: [java.lang.Throwable$WrappedPrintStream:println:-1]:     at net.minecraftforge.fml.server.FMLServerHandler.beginServerLoading(FMLServerHandler.java:88)
[01:38:57] [Server thread/INFO] [STDERR]: [java.lang.Throwable$WrappedPrintStream:println:-1]:     at net.minecraftforge.fml.common.FMLCommonHandler.onServerStart(FMLCommonHandler.java:355)
[01:38:57] [Server thread/INFO] [STDERR]: [java.lang.Throwable$WrappedPrintStream:println:-1]:     at net.minecraft.server.dedicated.DedicatedServer.startServer(DedicatedServer.java:120)
[01:38:57] [Server thread/INFO] [STDERR]: [java.lang.Throwable$WrappedPrintStream:println:-1]:     at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:500)
[01:38:57] [Server thread/INFO] [STDERR]: [java.lang.Throwable$WrappedPrintStream:println:-1]:     at java.lang.Thread.run(Unknown Source)

Spoiler

 public MCBEventHandler eventManager = new MCBEventHandler();

 

@EventHandler
    public void preInit(FMLPreInitializationEvent event)
    {
        MinecraftForge.EVENT_BUS.register(eventManager);
        FMLCommonHandler.instance().bus().register(eventManager);
        MinecraftForge.ORE_GEN_BUS.register(eventManager);
        System.out.println("Event Handler Initialized");
        
    }

Also important: I do have an empty constructor for the event handler class.

So since everything works that problem is not that bad - it's just annoying having the same error messages every time.

 

Thanks for the help.

Edited June 15, 2017 by blooditor

[draganz]

One thing, is that you are registering your event twice, remove the deprecated FMLCommonHandler bus register

[blooditor]

57 minutes ago, diesieben07 said:

Post MCBEventHandler.

Spoiler

public class MCBEventHandler {

    public MCBEventHandler() {
    }
    
     @SubscribeEvent
        public void loadChunk(ChunkEvent.Load e){
       
        }

         @SubscribeEvent
        public void playerLogin(PlayerEvent.PlayerLoggedInEvent e){
    

        }

        @SubscribeEvent
        public void playerLogout(PlayerEvent.PlayerLoggedOutEvent e){
          

        }
         @SubscribeEvent
        public void onHit(LivingAttackEvent e){
           
        }
        @SubscribeEvent
        public void onHurt(LivingHurtEvent e){
           
        }
        
         @SubscribeEvent
        public void onKill(LivingDeathEvent e){
         
        }
        @SubscribeEvent
        public void spawn(EntityJoinWorldEvent e){
           
        }
        @SubscribeEvent
        public void onMove(LivingUpdateEvent e){
            
        }
        @SubscribeEvent
        public void interact(EntityInteractEvent e){

        }
        @SubscribeEvent
        public void chat(ServerChatEvent e){
          
        }
       @SubscribeEvent
        public void playerLoggedIn(FMLNetworkEvent.ServerConnectionFromClientEvent event)
        {
           
            NetHandlerPlayServer handler = (NetHandlerPlayServer) event.handler;
            EntityPlayerMP player = handler.playerEntity;

          
        }
       @SubscribeEvent
        public void attackEntity(AttackEntityEvent e){
          
        }
        

        @SubscribeEvent
        public void tick(ServerTickEvent e){
          
        }
        
        @EventHandler
        public void serverStop(FMLServerStoppingEvent e){
         
        }
        
   
        @SubscribeEvent
        public void blockInteract(final PlayerInteractEvent e){
         
        }
        @SubscribeEvent
        public void playerUseItem(PlayerUseItemEvent e){
            
        }
        
        @SubscribeEvent
        public void explosion(ExplosionEvent e){
           
        }
        
        @SubscribeEvent
        public void detonate(ExplosionEvent.Detonate e){
          
        }
                
        
        
        @SubscribeEvent
        public void blockBreak(BlockEvent.BreakEvent e){
          
        }        
        @SubscribeEvent
        public void blockPlace(BlockEvent.PlaceEvent e){
          
        }
        
        @SubscribeEvent
        public void blockPlace(BlockEvent.MultiPlaceEvent e){
          
        }
        @SubscribeEvent
        public void entitySpawn(EntityJoinWorldEvent e){
          
        }
        @SubscribeEvent
        public void oreGen(PlayerChangedDimensionEvent e){
           
        }
        @SubscribeEvent
        public void ch(PopulateChunkEvent.Pre e){
           
        }
        @SubscribeEvent
        public void vehiclePlaced(EntityJoinWorldEvent event)
        {
           
        }
        @SubscribeEvent
        public void enderTp(EnderTeleportEvent e){
            
        }

        @SubscribeEvent
        public void worldTick(WorldTickEvent e){
         
        }
        @SubscribeEvent
        public void command(CommandEvent e){
           
        }

Sorry I had to remove the method content for security reasons.

[blooditor]

6 hours ago, draganz said:

One thing, is that you are registering your event twice, remove the deprecated FMLCommonHandler bus register

But that wouldn't cause an Exception on the other two registrations, right?

[blooditor]

32 minutes ago, diesieben07 said:

What Minecraft version are you using? EntityInteractEvent has not existed for a while, please update.#

Using MC 1.8.

EntityInteractEventworks fine.

33 minutes ago, diesieben07 said:

 

And this is complete bullshit.

Nope it isn't. I'm not creating my own server mod for others copying stuff from it.

[blooditor]

3 minutes ago, diesieben07 said:

1.8 is ancient. Update.

 

You cannot subscribe to an abstract event class (PlayerUseItemEvent), choose one of the sub-classes.

Oh wow that actually worked. That method was empty anyways. Thanks

[blooditor]

5 hours ago, diesieben07 said:

Good. And now please stop using 1.8. For real.

Tell that Flan's Mod