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[1.7.10] Struggling to sync IEEP from server to client


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Can someone please help me fix this NPE?


I've created some IEEP's that I want to sync from the server to the client for GUI rendering.  The saving on serverside works just fine (i.e. EntityConstructingEvent and changing values serverside).  After I added the PlayerJoinWorld event handler, I get an NPE on world join and am taken to the server selection screen.



[10:41:21] [Client thread/ERROR] [FML]: SimpleChannelHandlerWrapper exception
at com.mierzen.recall.ExtendedPlayer.loadNBTData(ExtendedPlayer.java:49) ~[ExtendedPlayer.class:?]
at com.mierzen.recall.packets.MessageSyncPlayerProps.handleClientSide(MessageSyncPlayerProps.java:33) ~[MessageSyncPlayerProps.class:?]
at com.mierzen.recall.packets.MessageSyncPlayerProps.handleClientSide(MessageSyncPlayerProps.java:15) ~[MessageSyncPlayerProps.class:?]
at com.mierzen.recall.packets.MessageBase.onMessage(MessageBase.java:20) ~[MessageBase.class:?]
at cpw.mods.fml.common.network.simpleimpl.SimpleChannelHandlerWrapper.channelRead0(SimpleChannelHandlerWrapper.java:37) ~[simpleChannelHandlerWrapper.class:?]
at cpw.mods.fml.common.network.simpleimpl.SimpleChannelHandlerWrapper.channelRead0(SimpleChannelHandlerWrapper.java:17) ~[simpleChannelHandlerWrapper.class:?]
at io.netty.channel.SimpleChannelInboundHandler.channelRead(SimpleChannelInboundHandler.java:98) ~[simpleChannelInboundHandler.class:?]
at io.netty.channel.DefaultChannelHandlerContext.invokeChannelRead(DefaultChannelHandlerContext.java:337) [DefaultChannelHandlerContext.class:?]
at io.netty.channel.DefaultChannelHandlerContext.fireChannelRead(DefaultChannelHandlerContext.java:323) [DefaultChannelHandlerContext.class:?]
at io.netty.handler.codec.MessageToMessageDecoder.channelRead(MessageToMessageDecoder.java:103) [MessageToMessageDecoder.class:?]
at io.netty.handler.codec.MessageToMessageCodec.channelRead(MessageToMessageCodec.java:111) [MessageToMessageCodec.class:?]
at io.netty.channel.DefaultChannelHandlerContext.invokeChannelRead(DefaultChannelHandlerContext.java:337) [DefaultChannelHandlerContext.class:?]
at io.netty.channel.DefaultChannelHandlerContext.fireChannelRead(DefaultChannelHandlerContext.java:323) [DefaultChannelHandlerContext.class:?]
at io.netty.channel.DefaultChannelPipeline.fireChannelRead(DefaultChannelPipeline.java:785) [DefaultChannelPipeline.class:?]
at io.netty.channel.embedded.EmbeddedChannel.writeInbound(EmbeddedChannel.java:169) [EmbeddedChannel.class:?]
at cpw.mods.fml.common.network.internal.FMLProxyPacket.processPacket(FMLProxyPacket.java:86) [FMLProxyPacket.class:?]
at net.minecraft.network.NetworkManager.processReceivedPackets(NetworkManager.java:241) [NetworkManager.class:?]
at net.minecraft.client.Minecraft.runTick(Minecraft.java:2152) [Minecraft.class:?]
at net.minecraft.client.Minecraft.runGameLoop(Minecraft.java:1039) [Minecraft.class:?]
at net.minecraft.client.Minecraft.run(Minecraft.java:962) [Minecraft.class:?]
at net.minecraft.client.main.Main.main(Main.java:164) [Main.class:?]
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:1.8.0_51]
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[?:1.8.0_51]
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[?:1.8.0_51]
at java.lang.reflect.Method.invoke(Method.java:497) ~[?:1.8.0_51]
at net.minecraft.launchwrapper.Launch.launch(Launch.java:135) [launchwrapper-1.12.jar:?]
at net.minecraft.launchwrapper.Launch.main(Launch.java:28) [launchwrapper-1.12.jar:?]
at net.minecraftforge.gradle.GradleStartCommon.launch(Unknown Source) [start/:?]
at GradleStart.main(Unknown Source) [start/:?] 



I am using the BaseMessage.java from MineMaarten's tutorial series http://pastebin.com/9ahZnbx9.


Here are my classes:

ExtendedPlayer.java http://pastebin.com/JrAhaeaJ

ExtendedPlayerHandler.java http://pastebin.com/DjmwAd3i

MessageSyncPlayerProps.java http://pastebin.com/Tp56qBVt

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You're getting a NPE on this line:

NBTTagCompound properties = (NBTTagCompound)compound.getTag(EXT_PROP_NAME);

The only thing that can be null in that line is the 'compound' parameter given to the method from your message handling, and the reason that's null is because of this:

    public void handleClientSide(MessageSyncPlayerProps message, EntityPlayer player)

Do you see that there is a 'message' parameter in there? That's the message that was received, but you are sending 'this.data', where 'this' is now the message handler, not the message. The handler doesn't know anything about what was sent or received, and that's one of the reasons that it can be confusing putting handling methods within the message class - you expect class fields to be available, but none of them are initialized to anything.


You can fix your problem now by using 'message.data' as the argument to loadNBTData, but I recommend you redesign your message handling so it's more intuitive to use.


Something like this, where the handling calls a method on the message instance itself, rather than passing the message instance to the method, let's you use code like you originally wanted to use.

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