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I'm running the task of invoking open source mode from intellij. I looked for a solution through Google, but only the opinion was to reboot Intellij, which did not work. Please give me some advice!

package net.spellcraftgaming.lib;

import java.util.List;

import org.lwjgl.opengl.GL11;

import net.minecraft.block.material.Material;
import net.minecraft.client.Minecraft;
import net.minecraft.client.entity.EntityPlayerSP;
import net.minecraft.client.gui.FontRenderer;
import net.minecraft.client.gui.Gui;
import net.minecraft.client.gui.GuiButton;
import net.minecraft.client.gui.GuiLabel;
import net.minecraft.client.gui.GuiScreen;
import net.minecraft.client.gui.inventory.GuiContainer;
import net.minecraft.client.renderer.BufferBuilder;
import net.minecraft.client.renderer.GlStateManager;
import net.minecraft.client.renderer.OpenGlHelper;
import net.minecraft.client.renderer.Tessellator;
import net.minecraft.client.renderer.vertex.VertexFormat;
import net.minecraft.entity.Entity;
import net.minecraft.entity.EntityLiving;
import net.minecraft.entity.EntityLivingBase;
import net.minecraft.entity.SharedMonsterAttributes;
import net.minecraft.entity.player.EntityPlayer;
import net.minecraft.init.Items;
import net.minecraft.init.MobEffects;
import net.minecraft.inventory.IInventory;
import net.minecraft.item.ItemStack;
import net.minecraft.item.ItemTippedArrow;
import net.minecraft.potion.Potion;
import net.minecraft.potion.PotionEffect;
import net.minecraft.potion.PotionType;
import net.minecraft.potion.PotionUtils;
import net.minecraft.util.EnumHandSide;
import net.minecraft.util.FoodStats;
import net.minecraft.util.ResourceLocation;
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.World;
import net.minecraftforge.client.event.GuiScreenEvent;
import net.minecraftforge.client.event.RenderGameOverlayEvent;
import net.minecraftforge.common.ForgeHooks;
import net.minecraftforge.event.entity.player.EntityItemPickupEvent;

public class GameData {

    protected static final ResourceLocation buttonTextures = new ResourceLocation("textures/gui/widgets.png");

    // General Minecraft Data
    private static Minecraft mc;

    public static Minecraft getMinecraft() {
        if(mc == null)
            mc = Minecraft.getMinecraft();
        return mc;
    }

    public static FontRenderer getFontRenderer() {
        return Minecraft.getMinecraft().fontRenderer;
    }

    public static World getWorldOfEntity(Entity entity) {
        return entity.world;
    }

    public static int getHotbarWidgetWidthOffset() {
        return 0;
    }

    public static boolean shouldDrawHUD() {
        return getMinecraft().playerController.shouldDrawHUD();
    }

    public static EntityPlayerSP getPlayer() {
        return getMinecraft().player;
    }

    // Player Data
    public static int getPlayerHealth() {
        return ceil(getPlayer().getHealth());
    }

    public static int getPlayerMaxHealth() {
        return ceil(getPlayer().getEntityAttribute(SharedMonsterAttributes.MAX_HEALTH).getAttributeValue());
    }

    public static int getPlayerAbsorption() {
        return floor(getPlayer().getAbsorptionAmount());
    }

    public static boolean isPlayerPoisoned() {
        return getPlayer().isPotionActive(MobEffects.POISON);
    }

    public static boolean isPlayerRegenerating() {
        return getPlayer().isPotionActive(MobEffects.REGENERATION);
    }

    public static boolean isPlayerWithering() {
        return getPlayer().isPotionActive(MobEffects.WITHER);
    }

    public static int getPlayerAir() {
        return getPlayer().getAir();
    }

    public static boolean isPlayerUnderwater() {
        return getPlayer().isInsideOfMaterial(Material.WATER);
    }

    public static int getPlayerArmor() {
        return ForgeHooks.getTotalArmorValue(getPlayer());
    }

    public static int getPlayerXPCap() {
        return getPlayer().xpBarCap();
    }

    public static float getPlayerXPRaw() {
        return getPlayer().experience;
    }

    public static int getPlayerXP() {
        return ceil(getPlayerXPCap() * getPlayer().experience);
    }

    public static FoodStats getPlayerFoodStats() {
        return getPlayer().getFoodStats();
    }

    public static int getPlayerFood() {
        return getPlayerFoodStats().getFoodLevel();
    }

    public static int getPlayerMaxFood() {
        return 20;
    }

    public static boolean doesPlayerNeedFood() {
        return getPlayerFoodStats().needFood();
    }

    public static boolean isPlayerHungered() {
        return getPlayer().isPotionActive(MobEffects.HUNGER);
    }

    public static boolean isPlayerCreative() {
        return getPlayer().isCreative();
    }

    public static ItemStack getMainhand() {
        return getPlayer().getHeldItemMainhand();
    }

    public static ItemStack getOffhand() {
        return getPlayer().getHeldItemOffhand();
    }

    public static Entity getMount() {
        return getPlayer().getRidingEntity();
    }

    public static boolean isRidingLivingMount() {
        return getMount() instanceof EntityLivingBase;
    }

    public static ItemStack getMainInventoryItemOfSlot(int slot) {
        return getPlayer().inventory.mainInventory.get(slot);
    }

    public static float getCooledAttackStrength() {
        return getPlayer().getCooledAttackStrength(0F);
    }

    public static float getCooldownPeriod() {
        return getPlayer().getCooldownPeriod();
    }

    public static float getItemAnimationsToGo(ItemStack item) {
        return item.getAnimationsToGo();
    }

    public static float getHorseJumpPower() {
        return getPlayer().getHorseJumpPower();
    }

    public static int getPlayerXPLevel() {
        return getPlayer().experienceLevel;
    }

    public static boolean hasPlayerClock() {
        return getPlayer().inventory.hasItemStack(new ItemStack(Items.CLOCK));
    }

    public static boolean hasPlayerCompass() {
        return getPlayer().inventory.hasItemStack(new ItemStack(Items.COMPASS));
    }

    public static int getPlayerArmorInventoryLength() {
        return getPlayer().inventory.armorInventory.size();
    }

    public static ItemStack getArmorInSlot(int slot) {
        return getPlayer().inventory.armorItemInSlot(slot);
    }

    public static ItemStack getItemInHand(int hand) {
        if(hand == 0)
            return getMainhand();
        else if(hand == 1)
            return getOffhand();
        else
            return nullStack();
    }

    public static int getOffhandSide() {
        if(getPlayer().getPrimaryHand() == EnumHandSide.RIGHT)
            return 0;
        else
            return 1;
    }

    public static int getInventorySize() {
        return getPlayer().inventory.getSizeInventory();
    }

    public static ItemStack getItemInSlot(int slot) {
        return getPlayer().inventory.getStackInSlot(slot);
    }

    public static int getItemStackSize(ItemStack item) {
        return item.getCount();
    }

    public static ItemStack setItemStackSize(ItemStack item, int count) {
        item.setCount(count);
        return item;
    }

    public static float getRotationYaw() {
        return getPlayer().rotationYaw;
    }

    public static long getWorldTime() {
        return getPlayer().getEntityWorld().getWorldTime();
    }

    public static int[] getPlayerPos() {
        int[] pos = new int[3];
        pos[0] = getPlayer().getPosition().getX();
        pos[1] = getPlayer().getPosition().getY();
        pos[2] = getPlayer().getPosition().getZ();
        return pos;
    }

    public static ItemStack nullStack() {
        return ItemStack.EMPTY;
    }

    public static World getWorld() {
        return getMinecraft().world;
    }

    public static int getAttackIndicatorSetting() {
        // return -1;
        return getMinecraft().gameSettings.attackIndicator;
    }

    public static int addArrowStackIfCorrect(ItemStack item, ItemStack arrow) {
        PotionType type1 = null;
        if(item.getItem() instanceof ItemTippedArrow)
            type1 = PotionUtils.getPotionTypeFromNBT(item.getTagCompound());
        if(item.getItem() instanceof ItemTippedArrow) {
            PotionType type2 = PotionUtils.getPotionTypeFromNBT(arrow.getTagCompound());
            if(type1.getEffects() == type2.getEffects())
                return GameData.getItemStackSize(arrow);
        } else
            return GameData.getItemStackSize(arrow);

        return GameData.getItemStackSize(arrow);
    }

    public static ItemStack arrowStack() {
        return new ItemStack(Items.ARROW);
    }

    public static void bindIcons() {
        getMinecraft().getTextureManager().bindTexture(Gui.ICONS);
    }

    public static void bindButtonTextures() {
        getMinecraft().getTextureManager().bindTexture(buttonTextures);
    }

    public static void renderItemIntoGUI(EntityPlayer player, ItemStack item, int xPos, int yPos) {
        getMinecraft().getRenderItem().renderItemAndEffectIntoGUI(item, xPos, yPos);
    }

    public static boolean spectatorStuff() {
        if(getMinecraft().playerController.isSpectator() && getMinecraft().pointedEntity == null) {
            RayTraceResult raytraceresult = getMinecraft().objectMouseOver;

            if(raytraceresult == null || raytraceresult.typeOfHit != RayTraceResult.Type.BLOCK)
                return true;

            BlockPos blockpos = raytraceresult.getBlockPos();

            net.minecraft.block.state.IBlockState state = GameData.getWorld().getBlockState(blockpos);
            if(!state.getBlock().hasTileEntity(state) || !(GameData.getWorld().getTileEntity(blockpos) instanceof IInventory))
                return true;
        }
        return false;
    }

    public static boolean isArrow(ItemStack item) {
        if(item != GameData.nullStack())
            return ItemStack.areItemsEqual(item, arrowStack());
        // return item.getItem() instanceof ItemArrow;

        return false;
    }

    public static void doRenderDirections() {
        OpenGlHelper.renderDirections(10);
    }

    // OpenGL stuff
    public static int getSrcAlpha() {
        return GL11.GL_SRC_ALPHA;
        // return GlStateManager.SourceFactor.SRC_ALPHA;
    }

    public static int getOneMinusSrcAlpha() {
        return GL11.GL_ONE_MINUS_SRC_ALPHA;
        // return GlStateManager.DestFactor.ONE_MINUS_SRC_ALPHA;
    }

    public static int getOneMinusDstColor() {
        return GL11.GL_ONE_MINUS_DST_COLOR;
        // return GlStateManager.DestFactor.ONE_MINUS_SRC_ALPHA;
    }

    public static int getOneMinusSrcColor() {
        return GL11.GL_ONE_MINUS_SRC_COLOR;
        // return GlStateManager.DestFactor.ONE_MINUS_SRC_ALPHA;
    }

    public static int getGlOne() {
        return GL11.GL_ONE;
        // return GlStateManager.SourceFactor.ONE;
    }

    public static int getGlZero() {
        return GL11.GL_ZERO;
        // return GlStateManager.SourceFactor.ZERO;
    }

    public static void tryBlendFuncSeparate() {
        GlStateManager.tryBlendFuncSeparate(getSrcAlpha(), getOneMinusSrcAlpha(), getGlOne(), getGlZero());
    }

    public static void tryBlendFuncCrosshair() {
        GlStateManager.tryBlendFuncSeparate(getOneMinusDstColor(), getOneMinusSrcColor(), getGlOne(), getGlZero());
    }

    public static void blendFunc() {
        GlStateManager.blendFunc(getSrcAlpha(), getOneMinusSrcAlpha());
    }

    public static EntityPlayer playerOfEvent(EntityItemPickupEvent event) {
        return event.getEntityPlayer();
    }

    public static ItemStack itemStackOfEvent(EntityItemPickupEvent event) {
        return event.getItem().getItem();
    }

    public static void beginVertex(int i, VertexFormat format) {
        Tessellator tessellator = Tessellator.getInstance();
        // WorldRenderer vertexbuffer = tessellator.getWorldRenderer();
        BufferBuilder vertexbuffer = tessellator.getBuffer();
        vertexbuffer.begin(i, format);
    }

    public static void addVertexPos(double x, double y, double z) {
        Tessellator tessellator = Tessellator.getInstance();
        // WorldRenderer vertexbuffer = tessellator.getWorldRenderer();
        BufferBuilder vertexbuffer = tessellator.getBuffer();
        vertexbuffer.pos(x, y, z).endVertex();
    }

    public static void drawVertex() {
        Tessellator tessellator = Tessellator.getInstance();
        tessellator.draw();
    }

    // Math functions
    public static int ceil(float value) {
        return MathHelper.ceil(value);
    }

    public static int floor(float value) {
        return MathHelper.floor(value);
    }

    public static int ceil(double value) {
        return MathHelper.ceil(value);
    }

    public static double clamp(double d1, double d2, double d3) {
        return MathHelper.clamp(d1, d2, d3);
    }

    public static float clamp(float f1, float f2, float f3) {
        return MathHelper.clamp(f1, f2, f3);
    }

    public static int clamp(int f1, int f2, int f3) {
        return MathHelper.clamp(f1, f2, f3);
    }

    public static int hsvToRGB(float f1, float f2, float f3) {
        // MathHelper.hsvToRGB(f1, f2, f3);
        return 0;
    }

    public static EntityLiving getFocusedEntity(Entity watcher) {
        EntityLiving focusedEntity = null;
        double maxDistance = 64;
        Vec3d vec = new Vec3d(watcher.posX, watcher.posY, watcher.posZ);
        Vec3d posVec = watcher.getPositionVector();
        if(watcher instanceof EntityPlayer) {
            vec = vec.addVector(0D, watcher.getEyeHeight(), 0D);
            posVec = posVec.addVector(0D, watcher.getEyeHeight(), 0D);
        }
        Vec3d lookVec = watcher.getLookVec();
        Vec3d vec2 = vec.add(lookVec.normalize().scale(maxDistance));
        RayTraceResult ray = GameData.getWorldOfEntity(watcher).rayTraceBlocks(vec, vec2);

        double distance = maxDistance;
        if(ray != null)
            distance = ray.hitVec.distanceTo(posVec);
        Vec3d reachVector = posVec.addVector(lookVec.x * maxDistance, lookVec.y * maxDistance, lookVec.z * maxDistance);

        double currentDistance = distance;

        List<Entity> entitiesWithinMaxDistance = GameData.getWorldOfEntity(watcher).getEntitiesWithinAABBExcludingEntity(watcher,
                watcher.getEntityBoundingBox().grow(lookVec.x * maxDistance, lookVec.y * maxDistance, lookVec.z * maxDistance).expand(1, 1, 1));
        for(Entity entity : entitiesWithinMaxDistance)
            if(entity instanceof EntityLiving) {
                float collisionBorderSize = entity.getCollisionBorderSize();
                AxisAlignedBB hitBox = entity.getEntityBoundingBox().expand(collisionBorderSize, collisionBorderSize, collisionBorderSize);
                RayTraceResult intercept = hitBox.calculateIntercept(posVec, reachVector);
                if(hitBox.contains(posVec)) {
                    if(currentDistance <= 0D) {
                        currentDistance = 0;
                        focusedEntity = (EntityLiving) entity;
                    }
                } else if(intercept != null) {
                    double distanceToEntity = posVec.distanceTo(intercept.hitVec);
                    if(distanceToEntity <= currentDistance) {
                        currentDistance = distanceToEntity;
                        focusedEntity = (EntityLiving) entity;
                    }
                }
            }
        return focusedEntity;
    }

    public static int getButtonX(GuiButton   {
        return b.x;
    }

    public static int getButtonY(GuiButton   {
        return b.x;
    }

    public static GuiScreen getGuiOfEvent(GuiScreenEvent event) {
        return event.getGui();
    }

    public static GuiLabel addLine(GuiLabel label, String string) {
        label.addLine(string);
        return label;
    }
    
    public static ResourceLocation icons() {
        return Gui.ICONS;
    }    
    public static RenderGameOverlayEvent.ElementType getType(RenderGameOverlayEvent event){
        return event.getType();
    }
    
    public static float getPartialTicks(RenderGameOverlayEvent event){
        return event.getPartialTicks();
    }
    
    public static RenderGameOverlayEvent.Chat setChatPosY(RenderGameOverlayEvent.Chat event, int offset) {
        event.setPosY(event.getPosY() + offset);
        return event;
    }
    
    public static void renderPotionHUDEffect(Gui gui, Potion potion, PotionEffect effect, int x, int y, float alpha) {
        potion.renderHUDEffect(effect, gui, x, y, -90, alpha);
    }
    
    public static ResourceLocation InventoryBackground() {
        return GuiContainer.INVENTORY_BACKGROUND;
    }
    
    public boolean isEffectBeneficial(Potion potion) {
        return potion.isBeneficial();
    }
}