Null pointer exception keeps getting thrown calling IBlockState

fuzzybat23 · July 1, 2017

So I'm trying to get the selection box to be colored, that's my first goal at least. I found the source, in RenderGlobal, that governs drawing the selection bounding box. I got my @Subscribeevent handler setup so it actually calls the drawSelectionBox() function.

public void drawSelectionBox(EntityPlayer player, RayTraceResult movingObjectPositionIn, int execute, float partialTicks)
{
LOGGER.info("DrawBlockSelectionBox Begin");
if (execute == 0 && movingObjectPositionIn.typeOfHit == RayTraceResult.Type.BLOCK)
{
LOGGER.info(" ******************* GlStateManager.enableBlend();");
GlStateManager.enableBlend();

LOGGER.info(" ******************* GlStateManager.tryBlendFuncSeparate(GlStateManager.SourceFactor.SRC_ALPHA, GlStateManager.DestFactor.ONE_MINUS_SRC_ALPHA, GlStateManager.SourceFactor.ONE, GlStateManager.DestFactor.ZERO);");
GlStateManager.tryBlendFuncSeparate(GlStateManager.SourceFactor.SRC_ALPHA, GlStateManager.DestFactor.ONE_MINUS_SRC_ALPHA, GlStateManager.SourceFactor.ONE, GlStateManager.DestFactor.ZERO);

LOGGER.info(" ******************* GlStateManager.glLineWidth(2.0F);");
GlStateManager.glLineWidth(2.0F);

LOGGER.info(" ******************* GlStateManager.disableTexture2D();");
GlStateManager.disableTexture2D();

LOGGER.info(" ******************* GlStateManager.depthMask(false);");
GlStateManager.depthMask(false);

LOGGER.info(" ******************* BlockPos blockpos = movingObjectPositionIn.getBlockPos();");
BlockPos blockpos = movingObjectPositionIn.getBlockPos();

LOGGER.info(" ******************* IBlockState iblockstate = this.world.getBlockState(blockpos);");
IBlockState iblockstate = this.world.getBlockState(blockpos);

LOGGER.info("if statement begin;");
if (iblockstate.getMaterial() != Material.AIR && this.world.getWorldBorder().contains(blockpos))
{
LOGGER.info("DrawBlockSelectionBoundingBox Begin");
double d0 = player.lastTickPosX + (player.posX - player.lastTickPosX) * (double)partialTicks;
double d1 = player.lastTickPosY + (player.posY - player.lastTickPosY) * (double)partialTicks;
double d2 = player.lastTickPosZ + (player.posZ - player.lastTickPosZ) * (double)partialTicks;
drawSelectionBoundingBox(iblockstate.getSelectedBoundingBox(this.world, blockpos).grow(0.0020000000949949026D).offset(-d0, -d1, -d2), 1.0F, 1.0F, 1.0F, 1.0F);
}

LOGGER.info(" GlStateManager.depthMask(true);");
GlStateManager.depthMask(true);

LOGGER.info(" GlStateManager.enableTexture2D();");
GlStateManager.enableTexture2D();

LOGGER.info(" GlStateManager.disableBlend();");
GlStateManager.disableBlend();
}
}

All those logger events were put in to trace a crash event. The world would load just fine, but the first time I look at a block it throws this error:

[09:46:11] [main/ERROR] [FML]: Exception caught during firing event net.minecraftforge.client.event.DrawBlockHighlightEvent@1c79e82c:
java.lang.NullPointerException: null

I tried the source of the error to this line of code, which seems to keep throwing a null whenever I look at a block.

            IBlockState iblockstate = this.world.getBlockState(blockpos);

But yet this doesn't happen in in the main RenderGlobal.class. Where am I going wrong?

Edited July 2, 2017 by fuzzybat23

jeffryfisher · July 2, 2017

A) You didn't share enough of the error log (I'm looking for any "caused by" or any "at" that references your code).

B) You didn't tell us what you saw in the debugger when you stopped the program on the verge of the exception and examined this.world.

C) Searching what I can see of your code, I can't see this.world being set, so I'll assume it isn't. That's your problem until you prove otherwise.

Edited July 2, 2017 by jeffryfisher

fuzzybat23 · July 2, 2017

Here's the full code.

package com.fuzzybat23.test1;

import com.fuzzybat23.test1.proxy.CommonProxy;

import com.google.common.collect.Lists;
import com.google.common.collect.Maps;
import com.google.common.collect.Queues;
import com.google.common.collect.Sets;
import com.google.gson.JsonSyntaxException;
import java.io.IOException;
import java.util.Collection;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import java.util.Queue;
import java.util.Random;
import java.util.Set;
import javax.annotation.Nullable;
import net.minecraft.block.Block;
import net.minecraft.block.BlockChest;
import net.minecraft.block.BlockEnderChest;
import net.minecraft.block.BlockSign;
import net.minecraft.block.BlockSkull;
import net.minecraft.block.SoundType;
import net.minecraft.block.material.Material;
import net.minecraft.block.state.IBlockState;
import net.minecraft.client.Minecraft;
import net.minecraft.client.audio.ISound;
import net.minecraft.client.audio.PositionedSoundRecord;
import net.minecraft.client.multiplayer.WorldClient;
import net.minecraft.client.particle.Particle;
import net.minecraft.client.renderer.BlockRendererDispatcher;
import net.minecraft.client.renderer.BufferBuilder;
import net.minecraft.client.renderer.DestroyBlockProgress;
import net.minecraft.client.renderer.GlStateManager;
import net.minecraft.client.renderer.Tessellator;
import net.minecraft.client.renderer.chunk.ChunkRenderDispatcher;
import net.minecraft.client.renderer.chunk.CompiledChunk;
import net.minecraft.client.renderer.chunk.IRenderChunkFactory;
import net.minecraft.client.renderer.chunk.ListChunkFactory;
import net.minecraft.client.renderer.chunk.RenderChunk;
import net.minecraft.client.renderer.chunk.VboChunkFactory;
import net.minecraft.client.renderer.chunk.VisGraph;
import net.minecraft.client.renderer.culling.ClippingHelper;
import net.minecraft.client.renderer.culling.ClippingHelperImpl;
import net.minecraft.client.renderer.culling.Frustum;
import net.minecraft.client.renderer.culling.ICamera;
import net.minecraft.client.renderer.entity.RenderManager;
import net.minecraft.client.renderer.texture.TextureAtlasSprite;
import net.minecraft.client.renderer.texture.TextureManager;
import net.minecraft.client.renderer.texture.TextureMap;
import net.minecraft.client.renderer.tileentity.TileEntityRendererDispatcher;
import net.minecraft.client.renderer.vertex.DefaultVertexFormats;
import net.minecraft.client.renderer.vertex.VertexBuffer;
import net.minecraft.client.renderer.vertex.VertexFormat;
import net.minecraft.client.renderer.vertex.VertexFormatElement;
import net.minecraft.client.resources.IResourceManager;
import net.minecraft.client.resources.IResourceManagerReloadListener;
import net.minecraft.client.shader.Framebuffer;
import net.minecraft.client.shader.ShaderGroup;
import net.minecraft.client.shader.ShaderLinkHelper;
import net.minecraft.crash.CrashReport;
import net.minecraft.crash.CrashReportCategory;
import net.minecraft.crash.ICrashReportDetail;
import net.minecraft.entity.Entity;
import net.minecraft.entity.EntityLivingBase;
import net.minecraft.entity.player.EntityPlayer;
import net.minecraft.init.Blocks;
import net.minecraft.init.Items;
import net.minecraft.init.SoundEvents;
import net.minecraft.item.Item;
import net.minecraft.item.ItemDye;
import net.minecraft.item.ItemRecord;
import net.minecraft.tileentity.TileEntity;
import net.minecraft.tileentity.TileEntityChest;
import net.minecraft.util.BlockRenderLayer;
import net.minecraft.util.ClassInheritanceMultiMap;
import net.minecraft.util.EnumFacing;
import net.minecraft.util.EnumParticleTypes;
import net.minecraft.util.ReportedException;
import net.minecraft.util.ResourceLocation;
import net.minecraft.util.SoundCategory;
import net.minecraft.util.SoundEvent;
import net.minecraft.util.math.AxisAlignedBB;
import net.minecraft.util.math.BlockPos;
import net.minecraft.util.math.MathHelper;
import net.minecraft.util.math.RayTraceResult;
import net.minecraft.util.math.Vec3d;
import net.minecraft.world.IBlockAccess;
import net.minecraft.world.IWorldEventListener;
import net.minecraft.world.World;
import net.minecraft.world.border.WorldBorder;
import net.minecraft.world.chunk.Chunk;
import net.minecraftforge.client.event.DrawBlockHighlightEvent;
import net.minecraftforge.common.MinecraftForge;
import net.minecraftforge.fml.common.Mod;
import net.minecraftforge.fml.common.Mod.EventHandler;
import net.minecraftforge.fml.common.Mod.Instance;
import net.minecraftforge.fml.common.SidedProxy;
import net.minecraftforge.fml.common.event.FMLInitializationEvent;
import net.minecraftforge.fml.common.event.FMLPostInitializationEvent;
import net.minecraftforge.fml.common.event.FMLPreInitializationEvent;
import net.minecraftforge.fml.common.eventhandler.SubscribeEvent;
import net.minecraftforge.fml.relauncher.Side;
import net.minecraftforge.fml.relauncher.SideOnly;
import org.apache.logging.log4j.LogManager;
import org.apache.logging.log4j.Logger;
import org.lwjgl.util.vector.Vector3f;
import org.lwjgl.util.vector.Vector4f;

@Mod(modid=Reference.Mod_ID, name=Reference.NAME, version=Reference.VERSION, acceptedMinecraftVersions=Reference.ACCEPTED_VERSIONS)
public class TestMod1 {
	
	//public class RenderGlobal implements IWorldEventListener, IResourceManagerReloadListener {
	
    private static final Logger LOGGER = LogManager.getLogger();
    private WorldClient world;


    
	@Instance
	public static TestMod1 instance;

	@SidedProxy(clientSide = Reference.CLIENT_PROXY_CLASS, serverSide = Reference.CLIENT_SERVER_CLASS)
	public static CommonProxy proxy;
	
	@EventHandler
	public void preInit(FMLPreInitializationEvent event)
	{
		LOGGER.info("PreInit Begin");
		proxy.registerTickHandler();
		MinecraftForge.EVENT_BUS.register(this);
		LOGGER.info("PreInit End");
	}
	
	@EventHandler
	public void Init(FMLInitializationEvent event)
	{
	
	}

	@EventHandler
	public void PostInit(FMLPostInitializationEvent event)
	{
	
	}
	
	@SubscribeEvent
	public void onDrawBlockSelectionBox(DrawBlockHighlightEvent e) {
		LOGGER.info("onDrawBlockSelectionBox Event Begin");
		drawSelectionBox(e.getPlayer(), e.getTarget(), e.getSubID(), e.getPartialTicks());
		LOGGER.info("onDrawBlockSelectionBox Event End");
		e.setCanceled(true);
	}
	
    /**
     * Draws the selection box for the player.
     */
    public void drawSelectionBox(EntityPlayer player, RayTraceResult movingObjectPositionIn, int execute, float partialTicks)
    {
		LOGGER.info("DrawBlockSelectionBox Begin");
        if (execute == 0 && movingObjectPositionIn.typeOfHit == RayTraceResult.Type.BLOCK)
        {
    		LOGGER.info(" ******************* GlStateManager.enableBlend();");
            GlStateManager.enableBlend();

            LOGGER.info(" ******************* GlStateManager.tryBlendFuncSeparate(GlStateManager.SourceFactor.SRC_ALPHA, GlStateManager.DestFactor.ONE_MINUS_SRC_ALPHA, GlStateManager.SourceFactor.ONE, GlStateManager.DestFactor.ZERO);");
            GlStateManager.tryBlendFuncSeparate(GlStateManager.SourceFactor.SRC_ALPHA, GlStateManager.DestFactor.ONE_MINUS_SRC_ALPHA, GlStateManager.SourceFactor.ONE, GlStateManager.DestFactor.ZERO);

            LOGGER.info(" ******************* GlStateManager.glLineWidth(2.0F);");
            GlStateManager.glLineWidth(2.0F);
    		
            LOGGER.info(" ******************* GlStateManager.disableTexture2D();");
            GlStateManager.disableTexture2D();
    		
            LOGGER.info(" ******************* GlStateManager.depthMask(false);");
            GlStateManager.depthMask(false);
    		
            LOGGER.info(" ******************* BlockPos blockpos = movingObjectPositionIn.getBlockPos();");
            BlockPos blockpos = movingObjectPositionIn.getBlockPos();
    		
            LOGGER.info(" ******************* IBlockState iblockstate = this.world.getBlockState(blockpos);");
            IBlockState iblockstate = this.world.getBlockState(blockpos);

            LOGGER.info("if statement begin;");
            if (iblockstate.getMaterial() != Material.AIR && this.world.getWorldBorder().contains(blockpos))
            {
        		LOGGER.info("DrawBlockSelectionBoundingBox Begin");
                double d0 = player.lastTickPosX + (player.posX - player.lastTickPosX) * (double)partialTicks;
                double d1 = player.lastTickPosY + (player.posY - player.lastTickPosY) * (double)partialTicks;
                double d2 = player.lastTickPosZ + (player.posZ - player.lastTickPosZ) * (double)partialTicks;
                drawSelectionBoundingBox(iblockstate.getSelectedBoundingBox(this.world, blockpos).grow(0.0020000000949949026D).offset(-d0, -d1, -d2), 1.0F, 1.0F, 1.0F, 1.0F);
            }

            LOGGER.info("            GlStateManager.depthMask(true);");
            GlStateManager.depthMask(true);
            
            LOGGER.info("            GlStateManager.enableTexture2D();");
            GlStateManager.enableTexture2D();
            
            LOGGER.info("            GlStateManager.disableBlend();");
            GlStateManager.disableBlend();
        }
    }

    public static void drawSelectionBoundingBox(AxisAlignedBB box, float red, float green, float blue, float alpha)
    {
		LOGGER.info("drawBowndingBox 1 Begin");
        drawBoundingBox(box.minX, box.minY, box.minZ, box.maxX, box.maxY, box.maxZ, red, green, blue, alpha);
    }

    public static void drawBoundingBox(double minX, double minY, double minZ, double maxX, double maxY, double maxZ, float red, float green, float blue, float alpha)
    {
		LOGGER.info("drawBowndingBox 2 Begin");
        Tessellator tessellator = Tessellator.getInstance();
        BufferBuilder bufferbuilder = tessellator.getBuffer();
        bufferbuilder.begin(3, DefaultVertexFormats.POSITION_COLOR);
        drawBoundingBox(bufferbuilder, minX, minY, minZ, maxX, maxY, maxZ, red, green, blue, alpha);
        tessellator.draw();
    }

    public static void drawBoundingBox(BufferBuilder buffer, double minX, double minY, double minZ, double maxX, double maxY, double maxZ, float red, float green, float blue, float alpha)
    {
		LOGGER.info("drawBowndingBox 3 Begin");
        buffer.pos(minX, minY, minZ).color(red, green, blue, 0.0F).endVertex();
        buffer.pos(minX, minY, minZ).color(red, green, blue, alpha).endVertex();
        buffer.pos(maxX, minY, minZ).color(red, green, blue, alpha).endVertex();
        buffer.pos(maxX, minY, maxZ).color(red, green, blue, alpha).endVertex();
        buffer.pos(minX, minY, maxZ).color(red, green, blue, alpha).endVertex();
        buffer.pos(minX, minY, minZ).color(red, green, blue, alpha).endVertex();
        buffer.pos(minX, maxY, minZ).color(red, green, blue, alpha).endVertex();
        buffer.pos(maxX, maxY, minZ).color(red, green, blue, alpha).endVertex();
        buffer.pos(maxX, maxY, maxZ).color(red, green, blue, alpha).endVertex();
        buffer.pos(minX, maxY, maxZ).color(red, green, blue, alpha).endVertex();
        buffer.pos(minX, maxY, minZ).color(red, green, blue, alpha).endVertex();
        buffer.pos(minX, maxY, maxZ).color(red, green, blue, 0.0F).endVertex();
        buffer.pos(minX, minY, maxZ).color(red, green, blue, alpha).endVertex();
        buffer.pos(maxX, maxY, maxZ).color(red, green, blue, 0.0F).endVertex();
        buffer.pos(maxX, minY, maxZ).color(red, green, blue, alpha).endVertex();
        buffer.pos(maxX, maxY, minZ).color(red, green, blue, 0.0F).endVertex();
        buffer.pos(maxX, minY, minZ).color(red, green, blue, alpha).endVertex();
        buffer.pos(maxX, minY, minZ).color(red, green, blue, 0.0F).endVertex();
    }
    
    

}

And the full console just before and at the moment of the crash:

[15:34:52] [main/INFO] [com.fuzzybat23.test1.TestMod1]: DrawBlockSelectionBox Begin
[15:34:52] [main/INFO] [com.fuzzybat23.test1.TestMod1]: onDrawBlockSelectionBox Event End
[15:34:52] [main/INFO] [com.fuzzybat23.test1.TestMod1]: onDrawBlockSelectionBox Event Begin
[15:34:52] [main/INFO] [com.fuzzybat23.test1.TestMod1]: DrawBlockSelectionBox Begin
[15:34:52] [main/INFO] [com.fuzzybat23.test1.TestMod1]:  ******************* GlStateManager.enableBlend();
[15:34:52] [main/INFO] [com.fuzzybat23.test1.TestMod1]:  ******************* GlStateManager.tryBlendFuncSeparate(GlStateManager.SourceFactor.SRC_ALPHA, GlStateManager.DestFactor.ONE_MINUS_SRC_ALPHA, GlStateManager.SourceFactor.ONE, GlStateManager.DestFactor.ZERO);
[15:34:52] [main/INFO] [com.fuzzybat23.test1.TestMod1]:  ******************* GlStateManager.glLineWidth(2.0F);
[15:34:52] [main/INFO] [com.fuzzybat23.test1.TestMod1]:  ******************* GlStateManager.disableTexture2D();
[15:34:52] [main/INFO] [com.fuzzybat23.test1.TestMod1]:  ******************* GlStateManager.depthMask(false);
[15:34:52] [main/INFO] [com.fuzzybat23.test1.TestMod1]:  ******************* BlockPos blockpos = movingObjectPositionIn.getBlockPos();
[15:34:52] [main/INFO] [com.fuzzybat23.test1.TestMod1]:  ******************* IBlockState iblockstate = this.world.getBlockState(blockpos);
[15:34:52] [main/ERROR] [FML]: Exception caught during firing event net.minecraftforge.client.event.DrawBlockHighlightEvent@59da1ddd:
java.lang.NullPointerException: null
	at com.fuzzybat23.test1.TestMod1.drawSelectionBox(TestMod1.java:183) ~[TestMod1.class:?]
	at com.fuzzybat23.test1.TestMod1.onDrawBlockSelectionBox(TestMod1.java:151) ~[TestMod1.class:?]
	at net.minecraftforge.fml.common.eventhandler.ASMEventHandler_8_TestMod1_onDrawBlockSelectionBox_DrawBlockHighlightEvent.invoke(.dynamic) ~[?:?]
	at net.minecraftforge.fml.common.eventhandler.ASMEventHandler.invoke(ASMEventHandler.java:90) ~[ASMEventHandler.class:?]
	at net.minecraftforge.fml.common.eventhandler.EventBus.post(EventBus.java:179) [EventBus.class:?]
	at net.minecraftforge.client.ForgeHooksClient.onDrawBlockHighlight(ForgeHooksClient.java:155) [ForgeHooksClient.class:?]
	at net.minecraft.client.renderer.EntityRenderer.renderWorldPass(EntityRenderer.java:1403) [EntityRenderer.class:?]
	at net.minecraft.client.renderer.EntityRenderer.renderWorld(EntityRenderer.java:1303) [EntityRenderer.class:?]
	at net.minecraft.client.renderer.EntityRenderer.updateCameraAndRender(EntityRenderer.java:1106) [EntityRenderer.class:?]
	at net.minecraft.client.Minecraft.runGameLoop(Minecraft.java:1192) [Minecraft.class:?]
	at net.minecraft.client.Minecraft.run(Minecraft.java:436) [Minecraft.class:?]
	at net.minecraft.client.main.Main.main(Main.java:118) [Main.class:?]
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:1.8.0_131]
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[?:1.8.0_131]
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[?:1.8.0_131]
	at java.lang.reflect.Method.invoke(Method.java:498) ~[?:1.8.0_131]
	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 sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:1.8.0_131]
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[?:1.8.0_131]
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[?:1.8.0_131]
	at java.lang.reflect.Method.invoke(Method.java:498) ~[?:1.8.0_131]
	at net.minecraftforge.gradle.GradleStartCommon.launch(GradleStartCommon.java:97) [start/:?]
	at GradleStart.main(GradleStart.java:26) [start/:?]
[15:34:52] [main/ERROR] [FML]: Index: 1 Listeners:
[15:34:52] [main/ERROR] [FML]: 0: NORMAL
[15:34:52] [main/ERROR] [FML]: 1: ASM: com.fuzzybat23.test1.TestMod1@eefc1bf onDrawBlockSelectionBox(Lnet/minecraftforge/client/event/DrawBlockHighlightEvent;)V
[15:34:53] [Server thread/INFO]: Stopping server
[15:34:53] [Server thread/INFO]: Saving players
[15:34:53] [Server thread/INFO]: Saving worlds
[15:34:53] [Server thread/INFO]: Saving chunks for level 'New World'/overworld
[15:34:53] [Server thread/INFO]: Saving chunks for level 'New World'/the_nether
[15:34:53] [Server thread/INFO]: Saving chunks for level 'New World'/the_end
[15:34:53] [Server thread/INFO] [FML]: Unloading dimension 0
[15:34:53] [Server thread/INFO] [FML]: Unloading dimension -1
[15:34:53] [Server thread/INFO] [FML]: Unloading dimension 1
[15:34:54] [main/FATAL]: Unreported exception thrown!
java.lang.NullPointerException: null
	at com.fuzzybat23.test1.TestMod1.drawSelectionBox(TestMod1.java:183) ~[TestMod1.class:?]
	at com.fuzzybat23.test1.TestMod1.onDrawBlockSelectionBox(TestMod1.java:151) ~[TestMod1.class:?]
	at net.minecraftforge.fml.common.eventhandler.ASMEventHandler_8_TestMod1_onDrawBlockSelectionBox_DrawBlockHighlightEvent.invoke(.dynamic) ~[?:?]
	at net.minecraftforge.fml.common.eventhandler.ASMEventHandler.invoke(ASMEventHandler.java:90) ~[ASMEventHandler.class:?]
	at net.minecraftforge.fml.common.eventhandler.EventBus.post(EventBus.java:179) ~[EventBus.class:?]
	at net.minecraftforge.client.ForgeHooksClient.onDrawBlockHighlight(ForgeHooksClient.java:155) ~[ForgeHooksClient.class:?]
	at net.minecraft.client.renderer.EntityRenderer.renderWorldPass(EntityRenderer.java:1403) ~[EntityRenderer.class:?]
	at net.minecraft.client.renderer.EntityRenderer.renderWorld(EntityRenderer.java:1303) ~[EntityRenderer.class:?]
	at net.minecraft.client.renderer.EntityRenderer.updateCameraAndRender(EntityRenderer.java:1106) ~[EntityRenderer.class:?]
	at net.minecraft.client.Minecraft.runGameLoop(Minecraft.java:1192) ~[Minecraft.class:?]
	at net.minecraft.client.Minecraft.run(Minecraft.java:436) [Minecraft.class:?]
	at net.minecraft.client.main.Main.main(Main.java:118) [Main.class:?]
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:1.8.0_131]
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[?:1.8.0_131]
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[?:1.8.0_131]
	at java.lang.reflect.Method.invoke(Method.java:498) ~[?:1.8.0_131]
	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 sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:1.8.0_131]
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[?:1.8.0_131]
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[?:1.8.0_131]
	at java.lang.reflect.Method.invoke(Method.java:498) ~[?:1.8.0_131]
	at net.minecraftforge.gradle.GradleStartCommon.launch(GradleStartCommon.java:97) [start/:?]
	at GradleStart.main(GradleStart.java:26) [start/:?]
[15:34:54] [main/INFO] [STDOUT]: [net.minecraft.init.Bootstrap:printToSYSOUT:629]: ---- Minecraft Crash Report ----
// I feel sad now :(

Time: 7/2/17 3:34 PM
Description: Unexpected error

java.lang.NullPointerException: Unexpected error
	at com.fuzzybat23.test1.TestMod1.drawSelectionBox(TestMod1.java:183)
	at com.fuzzybat23.test1.TestMod1.onDrawBlockSelectionBox(TestMod1.java:151)
	at net.minecraftforge.fml.common.eventhandler.ASMEventHandler_8_TestMod1_onDrawBlockSelectionBox_DrawBlockHighlightEvent.invoke(.dynamic)
	at net.minecraftforge.fml.common.eventhandler.ASMEventHandler.invoke(ASMEventHandler.java:90)
	at net.minecraftforge.fml.common.eventhandler.EventBus.post(EventBus.java:179)
	at net.minecraftforge.client.ForgeHooksClient.onDrawBlockHighlight(ForgeHooksClient.java:155)
	at net.minecraft.client.renderer.EntityRenderer.renderWorldPass(EntityRenderer.java:1403)
	at net.minecraft.client.renderer.EntityRenderer.renderWorld(EntityRenderer.java:1303)
	at net.minecraft.client.renderer.EntityRenderer.updateCameraAndRender(EntityRenderer.java:1106)
	at net.minecraft.client.Minecraft.runGameLoop(Minecraft.java:1192)
	at net.minecraft.client.Minecraft.run(Minecraft.java:436)
	at net.minecraft.client.main.Main.main(Main.java:118)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.lang.reflect.Method.invoke(Method.java:498)
	at net.minecraft.launchwrapper.Launch.launch(Launch.java:135)
	at net.minecraft.launchwrapper.Launch.main(Launch.java:28)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.lang.reflect.Method.invoke(Method.java:498)
	at net.minecraftforge.gradle.GradleStartCommon.launch(GradleStartCommon.java:97)
	at GradleStart.main(GradleStart.java:26)


A detailed walkthrough of the error, its code path and all known details is as follows:
---------------------------------------------------------------------------------------

-- Head --
Thread: Client thread
Stacktrace:
	at com.fuzzybat23.test1.TestMod1.drawSelectionBox(TestMod1.java:183)
	at com.fuzzybat23.test1.TestMod1.onDrawBlockSelectionBox(TestMod1.java:151)
	at net.minecraftforge.fml.common.eventhandler.ASMEventHandler_8_TestMod1_onDrawBlockSelectionBox_DrawBlockHighlightEvent.invoke(.dynamic)
	at net.minecraftforge.fml.common.eventhandler.ASMEventHandler.invoke(ASMEventHandler.java:90)
	at net.minecraftforge.fml.common.eventhandler.EventBus.post(EventBus.java:179)
	at net.minecraftforge.client.ForgeHooksClient.onDrawBlockHighlight(ForgeHooksClient.java:155)
	at net.minecraft.client.renderer.EntityRenderer.renderWorldPass(EntityRenderer.java:1403)
	at net.minecraft.client.renderer.EntityRenderer.renderWorld(EntityRenderer.java:1303)

-- Affected level --
Details:
	Level name: MpServer
	All players: 1 total; [EntityPlayerSP['Player204'/14, l='MpServer', x=-1532.50, y=4.00, z=94.50]]
	Chunk stats: MultiplayerChunkCache: 574, 574
	Level seed: 0
	Level generator: ID 01 - flat, ver 0. Features enabled: false
	Level generator options: 
	Level spawn location: World: (-1538,4,98), Chunk: (at 14,0,2 in -97,6; contains blocks -1552,0,96 to -1537,255,111), Region: (-4,0; contains chunks -128,0 to -97,31, blocks -2048,0,0 to -1537,255,511)
	Level time: 466 game time, 466 day time
	Level dimension: 0
	Level storage version: 0x00000 - Unknown?
	Level weather: Rain time: 0 (now: false), thunder time: 0 (now: false)
	Level game mode: Game mode: creative (ID 1). Hardcore: false. Cheats: false
	Forced entities: 13 total; [EntitySlime['Slime'/2, l='MpServer', x=-1594.94, y=4.00, z=67.94], EntitySlime['Slime'/3, l='MpServer', x=-1592.69, y=5.18, z=88.27], EntitySlime['Slime'/4, l='MpServer', x=-1578.51, y=4.80, z=70.82], EntitySlime['Slime'/5, l='MpServer', x=-1578.43, y=5.02, z=68.50], EntitySlime['Slime'/6, l='MpServer', x=-1567.73, y=5.25, z=79.18], EntitySlime['Slime'/7, l='MpServer', x=-1543.21, y=4.00, z=106.40], EntitySlime['Slime'/9, l='MpServer', x=-1534.04, y=5.17, z=22.18], EntitySlime['Slime'/10, l='MpServer', x=-1527.44, y=4.00, z=122.01], EntitySlime['Slime'/8426, l='MpServer', x=-1525.81, y=4.75, z=148.99], EntitySlime['Slime'/12, l='MpServer', x=-1501.35, y=5.00, z=20.99], EntitySlime['Slime'/2066, l='MpServer', x=-1523.56, y=5.18, z=146.99], EntityPlayerSP['Player204'/14, l='MpServer', x=-1532.50, y=4.00, z=94.50], EntitySlime['Slime'/8059, l='MpServer', x=-1572.30, y=4.92, z=79.37]]
	Retry entities: 0 total; []
	Server brand: fml,forge
	Server type: Integrated singleplayer server
Stacktrace:
	at net.minecraft.client.multiplayer.WorldClient.addWorldInfoToCrashReport(WorldClient.java:456)
	at net.minecraft.client.Minecraft.addGraphicsAndWorldToCrashReport(Minecraft.java:2863)
	at net.minecraft.client.Minecraft.run(Minecraft.java:465)
	at net.minecraft.client.main.Main.main(Main.java:118)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.lang.reflect.Method.invoke(Method.java:498)
	at net.minecraft.launchwrapper.Launch.launch(Launch.java:135)
	at net.minecraft.launchwrapper.Launch.main(Launch.java:28)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.lang.reflect.Method.invoke(Method.java:498)
	at net.minecraftforge.gradle.GradleStartCommon.launch(GradleStartCommon.java:97)
	at GradleStart.main(GradleStart.java:26)

-- System Details --
Details:
	Minecraft Version: 1.12
	Operating System: Windows 10 (amd64) version 10.0
	Java Version: 1.8.0_131, Oracle Corporation
	Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation
	Memory: 774187752 bytes (738 MB) / 1037959168 bytes (989 MB) up to 1037959168 bytes (989 MB)
	JVM Flags: 3 total; -Xincgc -Xmx1024M -Xms1024M
	IntCache: cache: 0, tcache: 0, allocated: 0, tallocated: 0
	FML: MCP 9.40 Powered by Forge 14.21.1.2387 5 mods loaded, 5 mods active
	States: 'U' = Unloaded 'L' = Loaded 'C' = Constructed 'H' = Pre-initialized 'I' = Initialized 'J' = Post-initialized 'A' = Available 'D' = Disabled 'E' = Errored
	UCHIJAAAA	minecraft{1.12} [Minecraft] (minecraft.jar) 
	UCHIJAAAA	mcp{9.19} [Minecraft Coder Pack] (minecraft.jar) 
	UCHIJAAAA	FML{8.0.99.99} [Forge Mod Loader] (forgeSrc-1.12-14.21.1.2387.jar) 
	UCHIJAAAA	forge{14.21.1.2387} [Minecraft Forge] (forgeSrc-1.12-14.21.1.2387.jar) 
	UCHIJAAAA	ftm{1.0} [Test Mod] (bin) 
	Loaded coremods (and transformers): 
	GL info: ' Vendor: 'NVIDIA Corporation' Version: '4.5.0 NVIDIA 382.05' Renderer: 'GeForce GTX 770/PCIe/SSE2'
	Launched Version: 1.12
	LWJGL: 2.9.4
	OpenGL: GeForce GTX 770/PCIe/SSE2 GL version 4.5.0 NVIDIA 382.05, NVIDIA Corporation
	GL Caps: Using GL 1.3 multitexturing.
Using GL 1.3 texture combiners.
Using framebuffer objects because OpenGL 3.0 is supported and separate blending is supported.
Shaders are available because OpenGL 2.1 is supported.
VBOs are available because OpenGL 1.5 is supported.

	Using VBOs: Yes
	Is Modded: Definitely; Client brand changed to 'fml,forge'
	Type: Client (map_client.txt)
	Resource Packs: 
	Current Language: English (US)
	Profiler Position: N/A (disabled)
	CPU: 8x AMD FX(tm)-9370 Eight-Core Processor 
[15:34:54] [main/INFO] [STDOUT]: [net.minecraft.init.Bootstrap:printToSYSOUT:629]: #@!@# Game crashed! Crash report saved to: #@!@# E:\Users\RigAlpha\Desktop\Minecraft\Forge Mods\forge\run\.\crash-reports\crash-2017-07-02_15.34.54-client.txt
[15:34:54] [main/INFO] [FML]: Waiting for the server to terminate/save.
[15:34:54] [Server thread/INFO] [FML]: Applying holder lookups
[15:34:54] [Server thread/INFO] [FML]: Holder lookups applied
[15:34:54] [main/INFO] [FML]: Server terminated.
INDOWS\SYSTEM32\usermgrcli.dll (0x07F60000)
	C:\WINDOWS\SYSTEM32\nvoglv64.DLL (0x67680000)
	C:\WINDOWS\System32\SETUPAPI.dll (0x0E1C0000)
	C:\WINDOWS\SYSTEM32\WTSAPI32.dll (0x07E80000)
	C:\WINDOWS\SYSTEM32\DEVOBJ.dll (0x09E00000)
	C:\WINDOWS\System32\WINTRUST.dll (0x0C310000)
	C:\WINDOWS\System32\MSASN1.dll (0x0B310000)
	C:\WINDOWS\System32\CRYPT32.dll (0x0B890000)
	C:\WINDOWS\system32\nvspcap64.dll (0x020A0000)
	C:\WINDOWS\SYSTEM32\WINHTTP.dll (0x01050000)
	C:\WINDOWS\system32\nvapi64.dll (0x00350000)
	C:\WINDOWS\SYSTEM32\dxgi.dll (0x0A0F0000)
	C:\WINDOWS\System32\clbcatq.dll (0x0DD90000)
	C:\WINDOWS\SYSTEM32\sxs.dll (0x0B0E0000)
	C:\WINDOWS\SYSTEM32\mscms.dll (0x01C60000)
	C:\WINDOWS\SYSTEM32\icm32.dll (0xCF5D0000)
	C:\WINDOWS\SYSTEM32\WINSTA.dll (0x0A430000)
	C:\Users\RigAlpha\AppData\Local\Temp\jna--1407674802\jna1982780414597106931.dll (0xFB620000)
	C:\Users\RigAlpha\.gradle\caches\minecraft\net\minecraft\natives\1.12\OpenAL64.dll (0x2B000000)
	C:\WINDOWS\System32\MMDevApi.dll (0x05460000)
	C:\WINDOWS\System32\PROPSYS.dll (0x08080000)
	C:\WINDOWS\SYSTEM32\dsound.dll (0xF9A40000)
	C:\WINDOWS\SYSTEM32\AUDIOSES.DLL (0x00100000)
	C:\WINDOWS\SYSTEM32\AVRT.dll (0x07590000)
	C:\Program Files (x86)\Overwolf\0.105.48.0\x64\OWClient.dll (0xD9580000)
[0x7FFF0C527E30] ANOMALY: use of REX.w is meaningless (default operand size is 64)
[0x7FFF0C86F2D0] ANOMALY: meaningless REX prefix used
[0x7FFEDAA73690] ANOMALY: meaningless REX prefix used
[0x7FFEDAA77F30] ANOMALY: meaningless REX prefix used
AL lib: (EE) alc_cleanup: 1 device not closed
Java HotSpot(TM) 64-Bit Server VM warning: Using incremental CMS is deprecated and will likely be removed in a future release

fuzzybat23 · July 2, 2017

Oh yeah, the ClientProxy.java is:

package com.fuzzybat23.test1.proxy;

import net.minecraftforge.common.MinecraftForge;
import net.minecraftforge.fml.common.FMLCommonHandler;

public class ClientProxy extends CommonProxy {

	public void registerTickHandler() {
		FMLCommonHandler.instance().bus().register(this);
		MinecraftForge.EVENT_BUS.register(this);
	}
}

And the CommonProxy.java is:

package com.fuzzybat23.test1.proxy;

public class CommonProxy {
	public void registerTickHandler() {
	}
}

Jay Avery · July 2, 2017

So, you never initialise TestMod1.world.

fuzzybat23 · July 2, 2017

Yeah, I'm still pretty new to Java What would that look like?

Jay Avery · July 2, 2017

You need to assign a value to your world field - if you don't know what that means, you should probably focus on getting the hang of Java basics before working on a mod.

There are also other issues with your code. WorldClient is a client-only class, which means referencing it in in your main class will crash on the dedicated server. In general, you should usually use a world instance that is passed to you in whatever context you're using it, rather than storing your own. In this case you should be able to use the EntityPlayer's world.

fuzzybat23 · July 2, 2017

Something along the lines of this?

            IBlockState iblockstate = player.getEntityWorld().getBlockState(blockpos);

Jay Avery · July 2, 2017

2 minutes ago, fuzzybat23 said:
Something along the lines of this?
            IBlockState iblockstate = player.getEntityWorld().getBlockState(blockpos); 

Try it and see!

fuzzybat23 · July 2, 2017

Already did. I changed out every instance of this.world with player.getEntityWorld() Game ran with no crash and the bounding box is white, as I have it set in its color code portion. :>

fuzzybat23 · July 2, 2017

I'm trying to revitalize the Custom Selection Box mod from the ground up. Found the source in RenderGlobal, now I can butcher the original code to get the gui working how I want. The original coder stopped work on it in vs 1.3, then someone picked it up and updated it to 1.8 and he's not touched it since. Now that I have it functioning at least a little, it mots me way closer than I was before. Thanks :> Now I need to figure out why the game doesn't draw the selection box when you're under water

Edited July 2, 2017 by fuzzybat23

jeffryfisher · July 3, 2017

23 hours ago, Jay Avery said:

you never initialise TestMod1.world

Ha! My dark guess (bullet 'C') was right

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Null pointer exception keeps getting thrown calling IBlockState

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