Hello, I am sending a packet and it is returning with an error. I don't really know what is causing it or were to start because the stack trace is leading to forge code resulting in a NullPointerException. Basically I need to send a boolean value along with three other integers to all the player in the server when an event is triggered. So I had setup a LAN world and when the person hosting the LAN world triggered the event, the packet would send and would the tile entity render, this is what I need to syn with the packet, and it would update and sync fine, but when another player triggers the event the player crashes, and they would not crash before I added the packet sending code. I add a try-catch and had it print the stack trace and the packet gets sent and it sync every player, but the stack trace is returning a NullPointerException. I will post my code and the stack trace bellow, but if anyone needs any more code, just ask. All help is appreciated, Thank You!

 

My Code

 

try{

rc_mod.LogFirePacket.get(Side.SERVER).attr(FMLOutboundHandler.FML_MESSAGETARGET).set(FMLOutboundHandler.OutboundTarget.ALL); rc_mod.LogFirePacket.get(Side.SERVER).writeOutbound(new PacketLogFire(true, x, y, z));

} catch(NullPointerException e) {

e.printStackTrace();

return false;

 

 

Stack-Trace

 

 

java.lang.NullPointerException

at cpw.mods.fml.common.network.FMLOutboundHandler$OutboundTarget$5.selectNetworks(FMLOutboundHandler.java:129)

at cpw.mods.fml.common.network.FMLOutboundHandler.write(FMLOutboundHandler.java:273)

at io.netty.channel.DefaultChannelHandlerContext.invokeWrite(DefaultChannelHandlerContext.java:644)

at io.netty.channel.DefaultChannelHandlerContext.write(DefaultChannelHandlerContext.java:698)

at io.netty.channel.DefaultChannelHandlerContext.write(DefaultChannelHandlerContext.java:637)

at io.netty.handler.codec.MessageToMessageEncoder.write(MessageToMessageEncoder.java:115)

at io.netty.handler.codec.MessageToMessageCodec.write(MessageToMessageCodec.java:116)

at io.netty.channel.DefaultChannelHandlerContext.invokeWrite(DefaultChannelHandlerContext.java:644)

at io.netty.channel.DefaultChannelHandlerContext.write(DefaultChannelHandlerContext.java:698)

at io.netty.channel.DefaultChannelHandlerContext.write(DefaultChannelHandlerContext.java:637)

at io.netty.channel.DefaultChannelHandlerContext.write(DefaultChannelHandlerContext.java:626)

at io.netty.channel.DefaultChannelPipeline.write(DefaultChannelPipeline.java:878)

at io.netty.channel.AbstractChannel.write(AbstractChannel.java:229)

at io.netty.channel.embedded.EmbeddedChannel.writeOutbound(EmbeddedChannel.java:195)

at mod.xtronius.rc_mod.block.misc.BlockLogFire.onBlockActivated(BlockLogFire.java:133)

at net.minecraft.client.multiplayer.PlayerControllerMP.onPlayerRightClick(PlayerControllerMP.java:380)

at net.minecraft.client.Minecraft.func_147121_ag(Minecraft.java:1498)

at net.minecraft.client.Minecraft.runTick(Minecraft.java:2011)

at net.minecraft.client.Minecraft.runGameLoop(Minecraft.java:996)

at net.minecraft.client.Minecraft.run(Minecraft.java:912)

at net.minecraft.client.main.Main.main(Main.java:112)

at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)

at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)

at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)

at java.lang.reflect.Method.invoke(Unknown Source)

at net.minecraft.launchwrapper.Launch.launch(Launch.java:134)

at net.minecraft.launchwrapper.Launch.main(Launch.java:28)

 

 

 

 

Edit:

BlockLogFire Class

 

 

package mod.xtronius.rc_mod.block.misc;

 

import java.util.Random;

 

import cpw.mods.fml.common.network.FMLOutboundHandler;

import cpw.mods.fml.relauncher.Side;

import cpw.mods.fml.relauncher.SideOnly;

import mod.xtronius.rc_mod.rc_mod;

import mod.xtronius.rc_mod.Misc.IDs.MiscIDs;

import mod.xtronius.rc_mod.block.Blocks;

import mod.xtronius.rc_mod.creativetab.CreativeTab;

import mod.xtronius.rc_mod.packetHandling.main.ChannelHandler;

import mod.xtronius.rc_mod.packetHandling.packets.generalPackets.PacketLogFire;

import mod.xtronius.rc_mod.tileEntity.TileEntityFurnace1;

import mod.xtronius.rc_mod.tileEntity.TileEntityLogFire;

import mod.xtronius.rc_mod.util.Vec3;

import net.minecraft.block.Block;

import net.minecraft.block.BlockContainer;

import net.minecraft.block.material.Material;

import net.minecraft.client.renderer.texture.IIconRegister;

import net.minecraft.entity.player.EntityPlayer;

import net.minecraft.item.Item;

import net.minecraft.item.ItemStack;

import net.minecraft.tileentity.TileEntity;

import net.minecraft.util.AxisAlignedBB;

import net.minecraft.util.IIcon;

import net.minecraft.world.World;

 

 

public class BlockLogFire extends BlockContainer

{

private boolean hasIntitRender = false;

private boolean renderLogFire = false;

 

@SideOnly(Side.CLIENT)

    private IIcon[] iconArray;

 

    public BlockLogFire(int id)

    {

        super(Material.wood);

        this.setLightOpacity(0);

    }

   

    public int getRenderBlockPass()

    {

        return 0;

    }

   

    public int getRenderType()

    {

    if(!hasIntitRender) {

        if(rc_mod.playerSettings.settings.getPlayerSettingsValues("RenderRCFire", "b").equals(true)) {

        this.hasIntitRender = true;

        this.renderLogFire = true;

        } else

        this.hasIntitRender = true;

      }

       

        if(this.renderLogFire == true) {

        this.setBlockBounds(0.0F, 0.0F, 0.0F, 1.0F, 0.3F, 1.0F);

        return -1;

        } else {

        this.setBlockBounds(0.0F, 0.0F, 0.0F, 1.0F, 1.0F, 1.0F);

        return 0;

        }

    }

 

    public boolean renderAsNormalBlock()

    {

        return false;

    }

 

    public boolean isOpaqueCube()

    {

        return false;

    }

   

    @SideOnly(Side.CLIENT)

    public void registerBlockIcons(IIconRegister par1IconRegister)

    {

        this.iconArray = new IIcon[] {par1IconRegister.registerIcon(this.getTextureName() + "_layer_0"), par1IconRegister.registerIcon(this.getTextureName() + "_layer_1")};

    }

 

    @SideOnly(Side.CLIENT)

    public IIcon getFireIcon(int par1)

    {

        return this.iconArray[par1];

    }

 

    @SideOnly(Side.CLIENT)

 

    public IIcon getIcon(int par1, int par2)

    {

        return this.iconArray[0];

    }

   

    public AxisAlignedBB getCollisionBoundingBoxFromPool(World par1World, int par2, int par3, int par4)

    {

        return null;

    }

   

    public TileEntity createNewTileEntity(World world, int var1)

    {

        return new TileEntityLogFire(world);

    }

   

    public boolean canPlaceBlockAt(World par1World, int par2, int par3, int par4)

    {

        return super.canPlaceBlockAt(par1World, par2, par3, par4) && par1World.doesBlockHaveSolidTopSurface(par1World, par2, par3 - 1, par4);

    }

 

    public void onNeighborBlockChange(World par1World, int par2, int par3, int par4, int par5)

    {

        if (!par1World.doesBlockHaveSolidTopSurface(par1World, par2, par3 - 1, par4))

        {

            this.dropBlockAsItem(par1World, par2, par3, par4, par1World.getBlockMetadata(par2, par3, par4), 0);

            par1World.setBlockToAir(par2, par3, par4);

        }

    }

   

    public boolean onBlockActivated(World world, int x, int y, int z, EntityPlayer player, int side, float hitX, float hitY, float hitZ) {

   

    if(player.inventory != null && player.inventory.getCurrentItem() != null && player.inventory.getCurrentItem().getItem() != null) {

    if(player.inventory.getCurrentItem().getItem().equals(Item.getItemById(259))) {

    if(world.getTileEntity(x, y, z) != null && world.getTileEntity(x, y, z) instanceof TileEntityLogFire) {

    TileEntityLogFire tileEntity = (TileEntityLogFire) world.getTileEntity(x, y, z);

    if(tileEntity.isLit() != true) {

    tileEntity.setLit(true);

    //ChannelHandler.isLit.put(tileEntity, true);

   

    try{

    rc_mod.LogFirePacket.get(Side.SERVER).attr(FMLOutboundHandler.FML_MESSAGETARGET).set(FMLOutboundHandler.OutboundTarget.ALL);

    rc_mod.LogFirePacket.get(Side.SERVER).writeOutbound(new PacketLogFire(true, x, y, z));

    } catch(NullPointerException e) {

    return false;

    }

    return true;

    }

    }

    }

    }

    return false;

    }

   

    public void randomDisplayTick(World world, int x, int y, int z, Random rand)

    {

    if(world.isRemote) {

    if(world.getTileEntity(x, y, z) != null) {

    TileEntityLogFire entity = (TileEntityLogFire)world.getTileEntity(x, y, z);

    if(entity.isLit()) {

    for (int i = 0; i < 20; i++) {

       

        float f = 0;

        float f1 = 0;

        float f2 = 0;

       

        f = (float)x + 0.5F + rand.nextFloat() * 1F / 16.0F;

        f1 = (float)y + 0.175F;

        f2 = (float)z + 0.5F + rand.nextFloat() * 1F / 16.0F;

       

            world.spawnParticle("smoke", (double)(f), (double)f1, (double)(f2), 0.0D, 0.D, 0.0D);

           

    }

    }

    }

    }

    }

}

 

 

 

Packet Code

 

 

package mod.xtronius.rc_mod.packetHandling.packets.generalPackets;

 

import mod.xtronius.rc_mod.rc_mod;

import mod.xtronius.rc_mod.handlers.BlockBreakHandler;

import mod.xtronius.rc_mod.lib.ExtendedPlayer;

import mod.xtronius.rc_mod.packetHandling.main.ChannelHandler;

import mod.xtronius.rc_mod.packetHandling.main.IPacket;

import net.minecraft.entity.player.EntityPlayer;

import io.netty.buffer.ByteBuf;

 

public class PacketLogFire  implements IPacket{

 

    boolean isLit;

    int x;

    int y;

    int z;

   

    public PacketLogFire(){}

   

    public PacketLogFire(boolean isLit, int x, int y, int z) {

        this.isLit = isLit;

        this.x = x;

        this.y = y;

        this.z = z;

    }

 

    public void readBytes(ByteBuf bytes) {

    this.isLit = bytes.readBoolean();

    this.x = bytes.readInt();

    this.y = bytes.readInt();

    this.z = bytes.readInt();

    }

 

    public void writeBytes(ByteBuf bytes){

        bytes.writeBoolean(isLit);

        bytes.writeInt(x);

        bytes.writeInt(y);

        bytes.writeInt(z);

    }

 

@Override

public void executeClient(EntityPlayer player) {

 

System.out.println("X: " + x + " Y: " + y + " Z: " + z);

rc_mod.isLit.put(player.worldObj.getTileEntity(x, y, z), isLit);

}

 

@Override

public void executeServer(EntityPlayer player) {

 

}

}

 

 

 

What is your code for you LogFirePacket and for your BlockLogFire classes?

I edited my original post, the code should be there.

Do you really need to use a custom packet if you have a TileEntity associated with the block?  I thought TileEntities are automatically synced?  So I think you should put your custom block properties into fields in the TileEntity instead, when onBlockActivated() happens update them in the TileEntity, and forget about custom packets.