Need help with an error!!!

[Techno573]

I'm trying to make a mod, but i keep getting an error when i get killed by an entity...

 

Error:

[11:08:45] [Server thread/ERROR] [minecraft/MinecraftServer]: Encountered an unexpected exception
net.minecraft.crash.ReportedException: Ticking entity
	at net.minecraft.server.MinecraftServer.updateTimeLightAndEntities(MinecraftServer.java:890) ~[?:?] {re:classloading,pl:accesstransformer:B}
	at net.minecraft.server.MinecraftServer.tick(MinecraftServer.java:821) ~[?:?] {re:classloading,pl:accesstransformer:B}
	at net.minecraft.server.integrated.IntegratedServer.tick(IntegratedServer.java:120) ~[?:?] {re:classloading,pl:runtimedistcleaner:A}
	at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:662) [?:?] {re:classloading,pl:accesstransformer:B}
	at java.lang.Thread.run(Thread.java:748) [?:1.8.0_261] {}
Caused by: java.lang.NullPointerException
	at net.minecraft.entity.ai.controller.LookController.setLookPositionWithEntity(LookController.java:30) ~[?:?] {re:classloading}
	at net.minecraft.entity.ai.goal.MeleeAttackGoal.tick(MeleeAttackGoal.java:114) ~[?:?] {re:classloading}
	at net.minecraft.entity.ai.goal.PrioritizedGoal.tick(PrioritizedGoal.java:63) ~[?:?] {re:classloading}
	at java.util.stream.ForEachOps$ForEachOp$OfRef.accept(ForEachOps.java:184) ~[?:1.8.0_261] {}
	at java.util.stream.ReferencePipeline$2$1.accept(ReferencePipeline.java:175) ~[?:1.8.0_261] {}
	at java.util.Iterator.forEachRemaining(Iterator.java:116) ~[?:1.8.0_261] {}
	at java.util.Spliterators$IteratorSpliterator.forEachRemaining(Spliterators.java:1801) ~[?:1.8.0_261] {}
	at java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:482) ~[?:1.8.0_261] {}
	at java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:472) ~[?:1.8.0_261] {}
	at java.util.stream.ForEachOps$ForEachOp.evaluateSequential(ForEachOps.java:151) ~[?:1.8.0_261] {}
	at java.util.stream.ForEachOps$ForEachOp$OfRef.evaluateSequential(ForEachOps.java:174) ~[?:1.8.0_261] {}
	at java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:234) ~[?:1.8.0_261] {}
	at java.util.stream.ReferencePipeline.forEach(ReferencePipeline.java:418) ~[?:1.8.0_261] {}
	at net.minecraft.entity.ai.goal.GoalSelector.tick(GoalSelector.java:89) ~[?:?] {re:classloading}
	at net.minecraft.entity.MobEntity.updateEntityActionState(MobEntity.java:652) ~[?:?] {re:classloading,pl:accesstransformer:B}
	at net.minecraft.entity.LivingEntity.livingTick(LivingEntity.java:2426) ~[?:?] {re:classloading}
	at net.minecraft.entity.MobEntity.livingTick(MobEntity.java:512) ~[?:?] {re:classloading,pl:accesstransformer:B}
	at net.minecraft.entity.monster.MonsterEntity.livingTick(MonsterEntity.java:41) ~[?:?] {re:classloading}
	at net.minecraft.entity.LivingEntity.tick(LivingEntity.java:2264) ~[?:?] {re:classloading}
	at net.minecraft.entity.MobEntity.tick(MobEntity.java:311) ~[?:?] {re:classloading,pl:accesstransformer:B}
	at net.minecraft.world.server.ServerWorld.updateEntity(ServerWorld.java:615) ~[?:?] {re:classloading}
	at net.minecraft.world.World.guardEntityTick(World.java:586) ~[?:?] {re:classloading,pl:accesstransformer:B}
	at net.minecraft.world.server.ServerWorld.tick(ServerWorld.java:404) ~[?:?] {re:classloading}
	at net.minecraft.server.MinecraftServer.updateTimeLightAndEntities(MinecraftServer.java:886) ~[?:?] {re:classloading,pl:accesstransformer:B}
	... 4 more
[11:08:45] [Server thread/ERROR] [minecraft/MinecraftServer]: This crash report has been saved to: C:\Users\lucas_j6k2fnm\TechnoMods\TechnoScpMod\run\.\crash-reports\crash-2020-08-19_11.08.45-server.txt
[11:08:45] [Server thread/INFO] [minecraft/MinecraftServer]: Stopping server
[11:08:45] [Server thread/INFO] [minecraft/MinecraftServer]: Saving players
[11:08:45] [Server thread/INFO] [minecraft/ServerPlayNetHandler]: Dev lost connection: Disconnected
[11:08:45] [Server thread/INFO] [minecraft/MinecraftServer]: Dev left the game
[11:08:45] [Render thread/INFO] [STDOUT/]: [net.minecraft.util.registry.Bootstrap:printToSYSOUT:110]: ---- Minecraft Crash Report ----
// Who set us up the TNT?

Time: 19/08/20 11:08
Description: Ticking entity

java.lang.NullPointerException: Ticking entity
	at net.minecraft.entity.ai.controller.LookController.setLookPositionWithEntity(LookController.java:30) ~[?:?] {re:classloading}
	at net.minecraft.entity.ai.goal.MeleeAttackGoal.tick(MeleeAttackGoal.java:114) ~[?:?] {re:classloading}
	at net.minecraft.entity.ai.goal.PrioritizedGoal.tick(PrioritizedGoal.java:63) ~[?:?] {re:classloading}
	at java.util.stream.ForEachOps$ForEachOp$OfRef.accept(ForEachOps.java:184) ~[?:1.8.0_261] {}
	at java.util.stream.ReferencePipeline$2$1.accept(ReferencePipeline.java:175) ~[?:1.8.0_261] {}
	at java.util.Iterator.forEachRemaining(Iterator.java:116) ~[?:1.8.0_261] {}
	at java.util.Spliterators$IteratorSpliterator.forEachRemaining(Spliterators.java:1801) ~[?:1.8.0_261] {}
	at java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:482) ~[?:1.8.0_261] {}
	at java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:472) ~[?:1.8.0_261] {}
	at java.util.stream.ForEachOps$ForEachOp.evaluateSequential(ForEachOps.java:151) ~[?:1.8.0_261] {}
	at java.util.stream.ForEachOps$ForEachOp$OfRef.evaluateSequential(ForEachOps.java:174) ~[?:1.8.0_261] {}
	at java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:234) ~[?:1.8.0_261] {}
	at java.util.stream.ReferencePipeline.forEach(ReferencePipeline.java:418) ~[?:1.8.0_261] {}
	at net.minecraft.entity.ai.goal.GoalSelector.tick(GoalSelector.java:89) ~[?:?] {re:classloading}
	at net.minecraft.entity.MobEntity.updateEntityActionState(MobEntity.java:652) ~[?:?] {re:classloading,pl:accesstransformer:B}
	at net.minecraft.entity.LivingEntity.livingTick(LivingEntity.java:2426) ~[?:?] {re:classloading}
	at net.minecraft.entity.MobEntity.livingTick(MobEntity.java:512) ~[?:?] {re:classloading,pl:accesstransformer:B}
	at net.minecraft.entity.monster.MonsterEntity.livingTick(MonsterEntity.java:41) ~[?:?] {re:classloading}
	at net.minecraft.entity.LivingEntity.tick(LivingEntity.java:2264) ~[?:?] {re:classloading}
	at net.minecraft.entity.MobEntity.tick(MobEntity.java:311) ~[?:?] {re:classloading,pl:accesstransformer:B}
	at net.minecraft.world.server.ServerWorld.updateEntity(ServerWorld.java:615) ~[?:?] {re:classloading}
	at net.minecraft.world.World.guardEntityTick(World.java:586) ~[?:?] {re:classloading,pl:accesstransformer:B}
	at net.minecraft.world.server.ServerWorld.tick(ServerWorld.java:404) ~[?:?] {re:classloading}
	at net.minecraft.server.MinecraftServer.updateTimeLightAndEntities(MinecraftServer.java:886) ~[?:?] {re:classloading,pl:accesstransformer:B}
	at net.minecraft.server.MinecraftServer.tick(MinecraftServer.java:821) ~[?:?] {re:classloading,pl:accesstransformer:B}
	at net.minecraft.server.integrated.IntegratedServer.tick(IntegratedServer.java:120) ~[?:?] {re:classloading,pl:runtimedistcleaner:A}
	at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:662) ~[?:?] {re:classloading,pl:accesstransformer:B}
	at java.lang.Thread.run(Thread.java:748) ~[?:1.8.0_261] {}


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

-- Head --
Thread: Render thread
Stacktrace:
	at net.minecraft.entity.ai.controller.LookController.setLookPositionWithEntity(LookController.java:30)
	at net.minecraft.entity.ai.goal.MeleeAttackGoal.tick(MeleeAttackGoal.java:114)
	at net.minecraft.entity.ai.goal.PrioritizedGoal.tick(PrioritizedGoal.java:63)
	at java.util.stream.ForEachOps$ForEachOp$OfRef.accept(ForEachOps.java:184)
	at java.util.stream.ReferencePipeline$2$1.accept(ReferencePipeline.java:175)
	at java.util.Iterator.forEachRemaining(Iterator.java:116)
	at java.util.Spliterators$IteratorSpliterator.forEachRemaining(Spliterators.java:1801)
	at java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:482)
	at java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:472)
	at java.util.stream.ForEachOps$ForEachOp.evaluateSequential(ForEachOps.java:151)
	at java.util.stream.ForEachOps$ForEachOp$OfRef.evaluateSequential(ForEachOps.java:174)
	at java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:234)
	at java.util.stream.ReferencePipeline.forEach(ReferencePipeline.java:418)
	at net.minecraft.entity.ai.goal.GoalSelector.tick(GoalSelector.java:89)
	at net.minecraft.entity.MobEntity.updateEntityActionState(MobEntity.java:652)
	at net.minecraft.entity.LivingEntity.livingTick(LivingEntity.java:2426)
	at net.minecraft.entity.MobEntity.livingTick(MobEntity.java:512)
	at net.minecraft.entity.monster.MonsterEntity.livingTick(MonsterEntity.java:41)
	at net.minecraft.entity.LivingEntity.tick(LivingEntity.java:2264)
	at net.minecraft.entity.MobEntity.tick(MobEntity.java:311)
	at net.minecraft.world.server.ServerWorld.updateEntity(ServerWorld.java:615)

-- Entity being ticked --
Details:
	Entity Type: technoscp:plague_doctor (com.techno.technoscp.entity.PlagueDoctor)
	Entity ID: 1
	Entity Name: SCP-049 (The Plague Doctor)
	Entity's Exact location: 8.03, 4.00, 7.50
	Entity's Block location: World: (8,4,7), Chunk: (at 8,0,7 in 0,0; contains blocks 0,0,0 to 15,255,15), Region: (0,0; contains chunks 0,0 to 31,31, blocks 0,0,0 to 511,255,511)
	Entity's Momentum: 0.06, -0.08, 0.00
	Entity's Passengers: []
	Entity's Vehicle: ~~ERROR~~ NullPointerException: null
Stacktrace:
	at net.minecraft.world.World.guardEntityTick(World.java:586)
	at net.minecraft.world.server.ServerWorld.tick(ServerWorld.java:404)

-- Affected level --
Details:
	All players: 1 total; [ServerPlayerEntity['Dev'/2, l='New World', x=11.37, y=4.00, z=8.75]]
	Chunk stats: ServerChunkCache: 3025
	Level dimension: DimensionType{minecraft:overworld}
	Level name: New World
	Level seed: 1784877185438651786
	Level generator: ID 01 - flat, ver 0. Features enabled: true
	Level generator options: {biome:"minecraft:the_void",layers:[{block:"minecraft:air",height:1b}],structures:{decoration:{}}}
	Level spawn location: World: (0,4,0), Chunk: (at 0,0,0 in 0,0; contains blocks 0,0,0 to 15,255,15), Region: (0,0; contains chunks 0,0 to 31,31, blocks 0,0,0 to 511,255,511)
	Level time: 6682 game time, 6682 day time
	Known server brands: forge
	Level was modded: true
	Level storage version: 0x04ABD - Anvil
	Level weather: Rain time: 58478 (now: false), thunder time: 172260 (now: false)
	Level game mode: Game mode: creative (ID 1). Hardcore: false. Cheats: true
Stacktrace:
	at net.minecraft.server.MinecraftServer.updateTimeLightAndEntities(MinecraftServer.java:886)
	at net.minecraft.server.MinecraftServer.tick(MinecraftServer.java:821)
	at net.minecraft.server.integrated.IntegratedServer.tick(IntegratedServer.java:120)
	at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:662)
	at java.lang.Thread.run(Thread.java:748)

-- System Details --
Details:
	Minecraft Version: 1.15.2
	Minecraft Version ID: 1.15.2
	Operating System: Windows 10 (amd64) version 10.0
	Java Version: 1.8.0_261, Oracle Corporation
	Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation
	Memory: 216024112 bytes (206 MB) / 947912704 bytes (904 MB) up to 1901592576 bytes (1813 MB)
	CPUs: 4
	JVM Flags: 1 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump
	ModLauncher: 5.1.2+70+master.2845bb9
	ModLauncher launch target: fmluserdevclient
	ModLauncher naming: mcp
	ModLauncher services: 
		/eventbus-2.2.0-service.jar eventbus PLUGINSERVICE 
		/forge-1.15.2-31.2.0_mapped_snapshot_20200514-1.15.1-launcher.jar object_holder_definalize PLUGINSERVICE 
		/forge-1.15.2-31.2.0_mapped_snapshot_20200514-1.15.1-launcher.jar runtime_enum_extender PLUGINSERVICE 
		/accesstransformers-2.1.1-shadowed.jar accesstransformer PLUGINSERVICE 
		/forge-1.15.2-31.2.0_mapped_snapshot_20200514-1.15.1-launcher.jar capability_inject_definalize PLUGINSERVICE 
		/forge-1.15.2-31.2.0_mapped_snapshot_20200514-1.15.1-launcher.jar runtimedistcleaner PLUGINSERVICE 
		/forge-1.15.2-31.2.0_mapped_snapshot_20200514-1.15.1-launcher.jar fml TRANSFORMATIONSERVICE 
	FML: 31.2
	Forge: net.minecraftforge:31.2.0
	FML Language Providers: 
		javafml@31.2
		minecraft@1
	Mod List: 
		client-extra.jar Minecraft {minecraft@1.15.2 DONE}
		main Techno's SCP Mod {technoscp@1.15.2-1.0.0 DONE}
		forge-1.15.2-31.2.0_mapped_snapshot_20200514-1.15.1-recomp.jar Forge {forge@31.2.0 DONE}
	Player Count: 1 / 8; [ServerPlayerEntity['Dev'/2, l='New World', x=11.37, y=4.00, z=8.75]]
	Data Packs: vanilla, mod:technoscp, mod:forge (incompatible)
	Type: Integrated Server (map_client.txt)
	Is Modded: Definitely; Client brand changed to 'forge'

 

classes of the entities that give me the error:

 

PlagueDoctor

package com.techno.technoscp.entity;

import com.techno.technoscp.TechnoScp;
import com.techno.technoscp.init.ModEntityTypes;
import com.techno.technoscp.init.SoundTypes;
import net.minecraft.entity.*;
import net.minecraft.entity.ai.goal.*;
import net.minecraft.entity.merchant.villager.VillagerEntity;
import net.minecraft.entity.monster.MonsterEntity;
import net.minecraft.entity.monster.ZombieEntity;
import net.minecraft.entity.monster.ZombieVillagerEntity;
import net.minecraft.entity.player.PlayerEntity;
import net.minecraft.nbt.CompoundNBT;
import net.minecraft.nbt.NBTDynamicOps;
import net.minecraft.util.DamageSource;
import net.minecraft.util.SoundEvent;
import net.minecraft.util.math.BlockPos;
import net.minecraft.world.Difficulty;
import net.minecraft.world.World;
import net.minecraftforge.api.distmarker.Dist;
import net.minecraftforge.fml.common.Mod;

@Mod.EventBusSubscriber(modid = TechnoScp.MOD_ID,bus = Mod.EventBusSubscriber.Bus.FORGE,value = Dist.CLIENT)

public class PlagueDoctor extends MonsterEntity {

    public PlagueDoctor(EntityType<? extends MonsterEntity> type, World worldIn) {
        super(type, worldIn);
    }

    public PlagueDoctor createChild(AgeableEntity ageable) {
        PlagueDoctor entity = new PlagueDoctor(ModEntityTypes.PLAGUE_DOCTOR.get(), this.world);
        entity.onInitialSpawn(this.world, this.world.getDifficultyForLocation(new BlockPos(entity)), SpawnReason.BREEDING, (ILivingEntityData)null, (CompoundNBT)null);
        return entity;
    }

    @Override
    protected void registerGoals() {
        super.registerGoals();

        this.goalSelector.addGoal(0,new SwimGoal(this));
        this.goalSelector.addGoal(1,new MeleeAttackGoal(this,1.5D, false));
        this.goalSelector.addGoal(2,new NearestAttackableTargetGoal(this, PlayerEntity.class, true));
        this.goalSelector.addGoal(3,new NearestAttackableTargetGoal(this, DPersonnel.class, true));
        this.goalSelector.addGoal(4,new NearestAttackableTargetGoal(this, VillagerEntity.class, true));
        this.goalSelector.addGoal(5,new RandomWalkingGoal(this,1.0D));
        this.goalSelector.addGoal(6,new WaterAvoidingRandomWalkingGoal(this, 1.00D));
        this.goalSelector.addGoal(7,new LookAtGoal(this, PlayerEntity.class, 7.50f));

    }

    @Override
    protected void registerAttributes() {
        super.registerAttributes();
        this.getAttribute(SharedMonsterAttributes.MAX_HEALTH).setBaseValue(25.0D);
        this.getAttribute(SharedMonsterAttributes.MOVEMENT_SPEED).setBaseValue(0.15D);
        this.getAttribute(SharedMonsterAttributes.ATTACK_DAMAGE).setBaseValue(5.0D);
        this.getAttribute(SharedMonsterAttributes.FOLLOW_RANGE).setBaseValue(20.0D);

    }

    @Override
    protected SoundEvent getAmbientSound() {
        return SoundTypes.ENTITY_PLAGUE_DOCTOR_LINES.get();
    }

    @Override
    public void onKillEntity(LivingEntity killedEntity) {
        super.onKillEntity(killedEntity);
        if (killedEntity instanceof DPersonnel) {

            DPersonnel victimEntity = (DPersonnel) killedEntity;
            Corpse corpseEntity = ModEntityTypes.CORPSE.get().create(this.world);
            corpseEntity.copyLocationAndAnglesFrom(victimEntity);
            victimEntity.remove();
            corpseEntity.onInitialSpawn(this.world, this.world.getDifficultyForLocation(new BlockPos(corpseEntity)), SpawnReason.BREEDING, (ILivingEntityData) null, (CompoundNBT) null);
            corpseEntity.setNoAI(victimEntity.isAIDisabled());
            if (victimEntity.hasCustomName()) {
                corpseEntity.setCustomName(victimEntity.getCustomName());
                corpseEntity.setCustomNameVisible(victimEntity.isCustomNameVisible());
            }

            if (this.isNoDespawnRequired()) {
                corpseEntity.enablePersistence();
            }

            corpseEntity.setInvulnerable(this.isInvulnerable());
            this.world.addEntity(corpseEntity);
            this.world.playEvent((PlayerEntity) null, 1026, new BlockPos(this), 0);
        }
        else {
            return;
        }
    }
}

 

Corpse

package com.techno.technoscp.entity;

import com.techno.technoscp.TechnoScp;
import com.techno.technoscp.init.ModEntityTypes;
import com.techno.technoscp.init.SoundTypes;
import net.minecraft.entity.*;
import net.minecraft.entity.ai.goal.*;
import net.minecraft.entity.merchant.villager.VillagerEntity;
import net.minecraft.entity.monster.MonsterEntity;
import net.minecraft.entity.monster.ZombieEntity;
import net.minecraft.entity.player.PlayerEntity;
import net.minecraft.nbt.CompoundNBT;
import net.minecraft.util.SoundEvent;
import net.minecraft.util.SoundEvents;
import net.minecraft.util.math.BlockPos;
import net.minecraft.world.World;
import net.minecraftforge.api.distmarker.Dist;
import net.minecraftforge.fml.common.Mod;

@Mod.EventBusSubscriber(modid = TechnoScp.MOD_ID,bus = Mod.EventBusSubscriber.Bus.FORGE,value = Dist.CLIENT)

public class Corpse extends MonsterEntity {

    public Corpse(EntityType<? extends MonsterEntity> type, World worldIn) {
        super(type, worldIn);
    }

    public Corpse createChild(AgeableEntity ageable) {
        Corpse entity = new Corpse(ModEntityTypes.CORPSE.get(), this.world);
        entity.onInitialSpawn(this.world, this.world.getDifficultyForLocation(new BlockPos(entity)), SpawnReason.BREEDING, (ILivingEntityData)null, (CompoundNBT)null);
        return entity;
    }

    @Override
    protected void registerGoals() {
        super.registerGoals();

        this.goalSelector.addGoal(0,new SwimGoal(this));
        this.goalSelector.addGoal(1,new MeleeAttackGoal(this,1.5D, false));
        this.goalSelector.addGoal(2,new NearestAttackableTargetGoal(this, PlayerEntity.class, true));
        this.goalSelector.addGoal(3,new NearestAttackableTargetGoal(this, DPersonnel.class, true));
        this.goalSelector.addGoal(4,new NearestAttackableTargetGoal(this, VillagerEntity.class, true));
        this.goalSelector.addGoal(5,new RandomWalkingGoal(this,1.0D));
        this.goalSelector.addGoal(6,new WaterAvoidingRandomWalkingGoal(this, 1.00D));
        this.goalSelector.addGoal(7,new LookAtGoal(this, PlayerEntity.class, 7.50f));

    }


    @Override
    protected void registerAttributes() {
        super.registerAttributes();
        this.getAttribute(SharedMonsterAttributes.MAX_HEALTH).setBaseValue(25.0D);
        this.getAttribute(SharedMonsterAttributes.MOVEMENT_SPEED).setBaseValue(0.15D);
        this.getAttribute(SharedMonsterAttributes.ATTACK_DAMAGE).setBaseValue(5.0D);
        this.getAttribute(SharedMonsterAttributes.FOLLOW_RANGE).setBaseValue(20.0D);

    }

    @Override
    protected SoundEvent getAmbientSound() {
        return SoundEvents.ENTITY_ZOMBIE_AMBIENT;
    }

}

 

Can anyone help me?

 

EDIT: I've noticed a warning on the PlagueDoctor class, specifically on the line that says:

corpseEntity.copyLocationAndAnglesFrom(victimEntity);

 

i believe that the use of copyLocationAndAnglesFrom(victimEntity) is what's causing the error. In this case, what should i do?

 

Edited August 19, 2020 by Techno573
important information

[vemerion]

You should user the debug mode of your IDE together with breakpoints to figure out what is null. Also why have you annotated your entity classes with EventBusSubscriber?

[Techno573]

16 minutes ago, vemerion said:

You should user the debug mode of your IDE together with breakpoints to figure out what is null.

could you send to me the code line that does this? i'm quite new to java and i'm still learning...

 

16 minutes ago, vemerion said:

Also why have you annotated your entity classes with EventBusSubscriber?

I forgot that there. Thanks for pointing me this. I'll remove it...

 

Edit: I was looking at the PlagueDoctor class and i've noticed a warning on the line that says:

            corpseEntity.copyLocationAndAnglesFrom(victimEntity);

 

it says that it could cause a NullPointerException.

 

Edited August 19, 2020 by Techno573

[Draco18s]

13 minutes ago, Techno573 said:

could you send to me the code line that does this? i'm quite new to java and i'm still learning...

https://www.eclipse.org/community/eclipse_newsletter/2017/june/article1.php#:~:text=Breakpoints,double-click on this position.