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weird java.lang.InstantiationException when registering EventHandler

Posted June 15, 20178 yr

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, 20178 yr by blooditor

Quote

June 16, 20178 yr

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

Quote

June 16, 20178 yr

Author

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.

Quote

June 16, 20178 yr

Author

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?

Quote

June 16, 20178 yr

Author

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.

Quote

June 16, 20178 yr

Author

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

Quote

June 16, 20178 yr

Author

5 hours ago, diesieben07 said:

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

Tell that Flan's Mod

Quote

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