As a pretext to adding some Items to various mob and chest loot tables, I decided to just modify the vanilla zombie loot table. I think things are Registering correctly, but I am getting some null pointer exceptions thrown whenever loot generation occurs. Not even for Zombies. Just random stuff. Here's the details:

Code/JSON items relevant to issue(I think):

https://github.com/nuke3d/NukesEcon/blob/master/src/main/resources/data/forge/loot_modifiers/global_loot_modifiers.json

https://github.com/nuke3d/NukesEcon/blob/master/src/main/resources/data/nukesecon/loot_modifiers/zombie.json

https://github.com/nuke3d/NukesEcon/blob/master/src/main/java/com/nuke3dtv/nukesecon/data/LootTableModifier.java

https://github.com/nuke3d/NukesEcon/blob/master/src/main/java/com/nuke3dtv/nukesecon/setup/Registration.java

 

Exception detail:

[15:53:30] [Server thread/FATAL] [minecraft/ThreadTaskExecutor]: Error executing task on Server
java.lang.NullPointerException: null
    at net.minecraft.world.storage.loot.conditions.EntityHasProperty.test(EntityHasProperty.java:32) ~[?:?] {re:classloading}
    at net.minecraft.world.storage.loot.conditions.EntityHasProperty.test(EntityHasProperty.java:18) ~[?:?] {re:classloading}
    at net.minecraftforge.common.loot.LootModifier.apply(LootModifier.java:53) ~[?:?] {re:classloading}
    at net.minecraftforge.common.ForgeHooks.modifyLoot(ForgeHooks.java:1194) ~[?:?] {re:classloading}
    at net.minecraft.world.storage.loot.LootTable.generate(LootTable.java:86) ~[?:?] {re:classloading}
    at net.minecraft.block.Block.getDrops(Block.java:622) ~[?:?] {re:classloading,pl:accesstransformer:B}...

 

Any guidance on where the problem is would be appreciated. I'll keep plugging away at it in the meantime. Thank you!

 

Edited March 6, 20214 yr by Nuke3d
Solved

Quick update. I created a flat world and used a spawn egg to spawn a zombie. Killed the zombie and the error occurred again, so there's definitely something wrong with my stuff.

 

Here is a more complete error log:

[19:08:01] [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_151] {}
Caused by: java.lang.NullPointerException
	at net.minecraft.world.storage.loot.conditions.EntityHasProperty.test(EntityHasProperty.java:32) ~[?:?] {re:classloading}
	at net.minecraft.world.storage.loot.conditions.EntityHasProperty.test(EntityHasProperty.java:18) ~[?:?] {re:classloading}
	at net.minecraftforge.common.loot.LootModifier.apply(LootModifier.java:53) ~[?:?] {re:classloading}
	at net.minecraftforge.common.ForgeHooks.modifyLoot(ForgeHooks.java:1194) ~[?:?] {re:classloading}
	at net.minecraft.world.storage.loot.LootTable.generate(LootTable.java:86) ~[?:?] {re:classloading}
	at net.minecraft.entity.LivingEntity.dropLoot(LivingEntity.java:1246) ~[?:?] {re:classloading}
	at net.minecraft.entity.MobEntity.dropLoot(MobEntity.java:471) ~[?:?] {re:classloading,pl:accesstransformer:B}
	at net.minecraft.entity.LivingEntity.spawnDrops(LivingEntity.java:1204) ~[?:?] {re:classloading}
	at net.minecraft.entity.LivingEntity.onDeath(LivingEntity.java:1165) ~[?:?] {re:classloading}
	at net.minecraft.entity.LivingEntity.attackEntityFrom(LivingEntity.java:1013) ~[?:?] {re:classloading}
	at net.minecraft.entity.monster.MonsterEntity.attackEntityFrom(MonsterEntity.java:68) ~[?:?] {re:classloading}
	at net.minecraft.entity.monster.ZombieEntity.attackEntityFrom(ZombieEntity.java:335) ~[?:?] {re:classloading}
	at net.minecraft.entity.Entity.baseTick(Entity.java:428) ~[?:?] {re:classloading,pl:accesstransformer:B}
	at net.minecraft.entity.LivingEntity.baseTick(LivingEntity.java:289) ~[?:?] {re:classloading}
	at net.minecraft.entity.MobEntity.baseTick(MobEntity.java:232) ~[?:?] {re:classloading,pl:accesstransformer:B}
	at net.minecraft.entity.Entity.tick(Entity.java:396) ~[?:?] {re:classloading,pl:accesstransformer:B}
	at net.minecraft.entity.LivingEntity.tick(LivingEntity.java:2184) ~[?:?] {re:classloading}
	at net.minecraft.entity.MobEntity.tick(MobEntity.java:311) ~[?:?] {re:classloading,pl:accesstransformer:B}
	at net.minecraft.entity.monster.ZombieEntity.tick(ZombieEntity.java:224) ~[?:?] {re:classloading}
	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

 

Thank you! I will see about handling it manually for now. Planning on going to 1.16 soon, but wasn't go to do that quite yet.

Ended up moving to 1.16 where it worked fine. Thanks again.