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[1.7.10][Solved] "Crash" (Something with IMessage onMessage and heldItem)[

Posted February 11, 201510 yr

So it works fine without the heldItem part, but when i add that, it "crashes" (it shuts down and returns to the main menu).

The Message class (don't mind the "value")

package com.stefinus.Main.network;

import java.util.Random;

import com.stefinus.Main.SMainRegistry;

import net.minecraft.entity.passive.EntityCow;

import net.minecraft.entity.player.EntityPlayer;

import net.minecraft.entity.projectile.EntitySnowball;

import net.minecraft.item.ItemStack;

import net.minecraft.util.ChatComponentText;

import net.minecraft.world.World;

import cpw.mods.fml.common.network.simpleimpl.*;

import io.netty.buffer.ByteBuf;

public class ShootMessage implements IMessage {

private int value;

/**

* This is needed for netty to decode the message

* because the message is not created via a custom

* constructor but via new {Message}.fromBytes(buf)

public ShootMessage()

{

this.value = new Random().nextInt();

}

/**

* This is to read your bytes when receiving the packet.

@Override

public void fromBytes(ByteBuf buf)

{

this.value = buf.readInt();

}

/**

* This is to write your bytes when sending the packet.

@Override

public void toBytes(ByteBuf buf)

{

buf.writeInt(this.value);

}

/**

* This is the handler for the class, allowing access to all

* the functions and variables.

public static class Handler implements IMessageHandler<ShootMessage, IMessage> {

/**

* This gets called when the packet is read and received.

@Override

public IMessage onMessage(ShootMessage message, MessageContext ctx)

{

EntityPlayer player = ctx.getServerHandler().playerEntity;

World world = player.worldObj;

EntitySnowball ball = new EntitySnowball(world, player);

ItemStack heldItem = player.getHeldItem();

if(!world.isRemote && heldItem.getItem() == SMainRegistry.P90)

{

ctx.getServerHandler().playerEntity.worldObj.spawnEntityInWorld(ball);

}

return null;

}

The "crash" in the console.

[16:11:40] [server thread/INFO]: Player265 joined the game

[16:11:40] [Client thread/INFO] [FML]: [Client thread] Client side modded connection established

[16:11:41] [server thread/ERROR] [FML]: SimpleChannelHandlerWrapper exception

java.lang.NullPointerException

at com.stefinus.Main.network.ShootMessage$Handler.onMessage(ShootMessage.java:66) ~[shootMessage$Handler.class:?]

at com.stefinus.Main.network.ShootMessage$Handler.onMessage(ShootMessage.java:1) ~[shootMessage$Handler.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.network.NetworkSystem.networkTick(NetworkSystem.java:182) [NetworkSystem.class:?]

at net.minecraft.server.MinecraftServer.updateTimeLightAndEntities(MinecraftServer.java:726) [MinecraftServer.class:?]

at net.minecraft.server.MinecraftServer.tick(MinecraftServer.java:614) [MinecraftServer.class:?]

at net.minecraft.server.integrated.IntegratedServer.tick(IntegratedServer.java:118) [integratedServer.class:?]

at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:485) [MinecraftServer.class:?]

at net.minecraft.server.MinecraftServer$2.run(MinecraftServer.java:752) [MinecraftServer$2.class:?]

[16:11:41] [server thread/ERROR] [FML]: There was a critical exception handling a packet on channel stefinusguns

java.lang.NullPointerException

at com.stefinus.Main.network.ShootMessage$Handler.onMessage(ShootMessage.java:66) ~[shootMessage$Handler.class:?]

at com.stefinus.Main.network.ShootMessage$Handler.onMessage(ShootMessage.java:1) ~[shootMessage$Handler.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:?]