Hey everyone,

I need to send data from server to client whenever the client joins (some quests)

My problem is that I cant find the correct event for it.

 

I felt like PlayerLoggedInEvent should do the job, but sometimes the packet is "so fast" it reaches before Minecraft.getMinecraft.thePlayer is populated, which I need.

So what event do I use, what am I missing?

 

SideNote: Yes I know I should replace the PacketAddQuest with one Packet to sync allquests when the player joins, but thats a task for later

 

EventHandler

@SubscribeEvent
public void playerJoined(PlayerLoggedInEvent event) {
	QuestHolder holder =event.player.getCapability(CapabilityQuestHolder.CAPABILITY_QUEST_HANDLER, null);
	for (Quest quest : holder.getQuests()) {
		Questmod.network.sendTo(new PacketAddQuest(quest), (EntityPlayerMP) event.player);

	}
}

 

PacketAddQuestHandler

 

@Override
	public IMessage onMessage(PacketAddQuest message, MessageContext ctx) {
		QuestHolder holder = QuestHolderHandler.get();
		holder.addQuest(message.quest);

		return null;
	}

 

QuestHolder#get

 

@SideOnly(Side.CLIENT)
public static QuestHolder get() {
	System.out.println(Minecraft.getMinecraft().thePlayer); //null sometimes
	return Minecraft.getMinecraft().thePlayer.getCapability(CapabilityQuestHolder.CAPABILITY_QUEST_HANDLER, null);
}

http://greyminecraftcoder.blogspot.com.au/2015/01/thread-safety-with-network-messages.html

 

You are missing this. ^

Tarded me. Thank you very much ernio

Well. This reduced the occurency of the error but didnt removed it..

Its still there sometimes.

So you are getting the exact same error even after changing your message handler code to wait for the main thread? Post your updated code and the error log, if you would.

This should be everything that is problem related..

I found one solution but that one sucks seriously

 

EventHandler

@SubscribeEvent
public void playerJoined(final PlayerLoggedInEvent event) {
	final QuestHolder holder =event.player.getCapability(CapabilityQuestHolder.CAPABILITY_QUEST_HANDLER, null);

	/*
	 *Dirty workaround ..
	new Thread(new Runnable() {

		@Override
		public void run() {
			try {
				Thread.sleep(1000);
			} catch (InterruptedException e) {
				e.printStackTrace();
			}
			for (Quest quest : holder.getQuests()) {
				Questmod.network.sendTo(new PacketAddQuest(quest), (EntityPlayerMP) event.player);

			}

		}
	}).start();
	*/
	for (Quest quest : holder.getQuests()) {
		Questmod.network.sendTo(new PacketAddQuest(quest), (EntityPlayerMP) event.player);
	}

}

 

PacketHandler

@Override
	public IMessage onMessage(final PacketAddQuest message, MessageContext ctx) {
		Minecraft.getMinecraft().addScheduledTask(new Runnable() {

			@Override
			public void run() {
				QuestHolder holder = QuestHolderHandler.get();
				holder.addQuest(message.quest);
				System.out.println(holder.getQuests().size());

			}
		});


		return null;
	}

 

QuestHolderHandler#get

@SideOnly(Side.CLIENT)
public static QuestHolder get() {
                System.out.println(Minecraft.getMinecraft().thePlayer); //Prints null
	return Minecraft.getMinecraft().thePlayer.getCapability(CapabilityQuestHolder.CAPABILITY_QUEST_HANDLER, null); //Crash happens here (obvious reasons)
}

 

 

Crashlog

 

 

Caused by: java.lang.NullPointerException

at de.busybeever.questmod.questholder.QuestHolderHandler.get(QuestHolderHandler.java:83) ~[QuestHolderHandler.class:?]

at de.busybeever.questmod.network.PacketAddQuest.fromBytes(PacketAddQuest.java:35) ~[PacketAddQuest.class:?]

at net.minecraftforge.fml.common.network.simpleimpl.SimpleIndexedCodec.decodeInto(SimpleIndexedCodec.java:36) ~[simpleIndexedCodec.class:?]

at net.minecraftforge.fml.common.network.simpleimpl.SimpleIndexedCodec.decodeInto(SimpleIndexedCodec.java:26) ~[simpleIndexedCodec.class:?]

at net.minecraftforge.fml.common.network.FMLIndexedMessageToMessageCodec.decode(FMLIndexedMessageToMessageCodec.java:103) ~[FMLIndexedMessageToMessageCodec.class:?]

at net.minecraftforge.fml.common.network.FMLIndexedMessageToMessageCodec.decode(FMLIndexedMessageToMessageCodec.java:40) ~[FMLIndexedMessageToMessageCodec.class:?]

at io.netty.handler.codec.MessageToMessageCodec$2.decode(MessageToMessageCodec.java:81) ~[MessageToMessageCodec$2.class:4.0.23.Final]

at io.netty.handler.codec.MessageToMessageDecoder.channelRead(MessageToMessageDecoder.java:89) ~[MessageToMessageDecoder.class:4.0.23.Final]

... 24 more

 

 

Interesting. Well, one thing that may help and you should do anyway is to remove that static #get method you have and replace it with a method in your Proxy classes to retrieve the player; I also do the same thing for retrieving the main thread:

/**
* Returns a side-appropriate EntityPlayer for use during message handling
*/
public EntityPlayer getPlayerEntity(MessageContext ctx) {
return ctx.getServerHandler().playerEntity;
}

/**
* Returns the current thread based on side during message handling,
* used for ensuring that the message is being handled by the main thread
*/
public IThreadListener getThreadFromContext(MessageContext ctx) {
return ctx.getServerHandler().playerEntity.getServerForPlayer();
}

// CLIENT PROXY implementations
// note that yes, that ctx.side check IS necessary during single player specifically
@Override
public EntityPlayer getPlayerEntity(MessageContext ctx) {
return (ctx.side.isClient() ? Minecraft.getMinecraft().thePlayer : super.getPlayerEntity(ctx));
}

@Override
public IThreadListener getThreadFromContext(MessageContext ctx) {
return (ctx.side.isClient() ? Minecraft.getMinecraft() : super.getThreadFromContext(ctx));
}

This way you can call YourMod.proxy#getPlayerEntity or #getThreadFromContext which keeps Minecraft.getMinecraft() out of your handler classes.

 

Other than that, you can try switching to EntityJoinWorldEvent instead of PlayerLoggedInEvent, and if THAT doesn't work (but it should, well, so should the logged in event - I've used both just fine)), since that event is fired on both sides, you can wait until the client player joins the world and send a packet to the server requesting the synchronization packet be sent to the client. Lame but much much better than Thread.sleep

to be honest. it doesnt matter if I have Minecraft.getMinecraft().thePlayer in the handler method, because I am 100% sure that when I am inside this method it is on client side.

But changing to the other event isnt helping..

because I am 100% sure that when I am inside this method it is on client side

 

That's not the problem:

Does the class get loaded at all server side?

If yes, you can't use Minecraft.getMinecraft at all, ever, zero nadda, zip zilch.