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1.12 NPE trying to add a potion effect that doesn't exists

Posted November 13, 20195 yr

Hello, I'm trying to add configurable join effects to give to a player when he joins a world. This is my class:

@EventBusSubscriber
public class JoinEvent {

	@SubscribeEvent
	public static void onJoin(PlayerLoggedInEvent event) {
		EntityPlayer player = event.player;
		World world = player.world;
		String[] effects = ConfigHandler.joinpotions.effects;
		if (WorldHelper.isServer(world)) {
			if (effects.length > 0) {
				for (String effect : effects) {
					try {
						player.addPotionEffect(new PotionEffect(
								Potion.getPotionFromResourceLocation(effect.toUpperCase().split(",")[0]),
								Integer.valueOf(effect.split(",")[1]).intValue() * 20,
								Integer.valueOf(effect.split(",")[2]).intValue() * 20));
					} catch (NullPointerException e) {
						Messages.serverLog(Main.logger,
								"The effect \"" + effect.toLowerCase().split(",")[0] + "\" doesn't exists", 3);
					}
				}
			}
		}
	}
}

I dont know why you would be but if you want to know what is the Messages.serverLog then:

public static String serverLog(Logger logger, String message, Integer level) {
		if (level == 0) {
			logger.info(message);
		} else if (level == 1) {
			logger.warn(message);
		} else if (level == 2) {
			logger.error(message);
		} else if (level == 3) {
			logger.fatal(message);
		} else {
			logger.fatal("The error level (" + level
					+ ") selected is not recognized, You can select:\n0: Info\n1: Warn\n2: Error\n3: Fatal");
		}
		return message;
	}

My default effects are:

public String[] effects = { "minecraft:regeneration,60,1", "minecraft:resistance,60,1" };

and it works but when I try to add something like: (is an example)

notminecraft:notregeneration

The error that says that the effect doesn't exist works but after the game crash with

[09:12:15] [Server thread/ERROR] [minecraft/MinecraftServer]: Encountered an unexpected exception
net.minecraft.util.ReportedException: Ticking player
	at net.minecraft.network.NetworkSystem.networkTick(NetworkSystem.java:212) ~[NetworkSystem.class:?]
	at net.minecraft.server.MinecraftServer.updateTimeLightAndEntities(MinecraftServer.java:865) ~[MinecraftServer.class:?]
	at net.minecraft.server.MinecraftServer.tick(MinecraftServer.java:743) ~[MinecraftServer.class:?]
	at net.minecraft.server.integrated.IntegratedServer.tick(IntegratedServer.java:192) ~[IntegratedServer.class:?]
	at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:592) [MinecraftServer.class:?]
	at java.lang.Thread.run(Unknown Source) [?:1.8.0_221]
Caused by: java.lang.NullPointerException
	at net.minecraft.potion.PotionEffect.onUpdate(PotionEffect.java:127) ~[PotionEffect.class:?]
	at net.minecraft.entity.EntityLivingBase.updatePotionEffects(EntityLivingBase.java:688) ~[EntityLivingBase.class:?]
	at net.minecraft.entity.EntityLivingBase.onEntityUpdate(EntityLivingBase.java:406) ~[EntityLivingBase.class:?]
	at net.minecraft.entity.Entity.onUpdate(Entity.java:466) ~[Entity.class:?]
	at net.minecraft.entity.EntityLivingBase.onUpdate(EntityLivingBase.java:2315) ~[EntityLivingBase.class:?]
	at net.minecraft.entity.player.EntityPlayer.onUpdate(EntityPlayer.java:272) ~[EntityPlayer.class:?]
	at net.minecraft.entity.player.EntityPlayerMP.onUpdateEntity(EntityPlayerMP.java:423) ~[EntityPlayerMP.class:?]
	at net.minecraft.network.NetHandlerPlayServer.update(NetHandlerPlayServer.java:185) ~[NetHandlerPlayServer.class:?]
	at net.minecraftforge.fml.common.network.handshake.NetworkDispatcher$1.update(NetworkDispatcher.java:212) ~[NetworkDispatcher$1.class:?]
	at net.minecraft.network.NetworkManager.processReceivedPackets(NetworkManager.java:307) ~[NetworkManager.class:?]
	at net.minecraft.network.NetworkSystem.networkTick(NetworkSystem.java:197) ~[NetworkSystem.class:?]
	... 5 more
[09:12:15] [Server thread/ERROR] [minecraft/MinecraftServer]: This crash report has been saved to: C:\Users\cpiva\Documents\GitHub\CrisCore\run\.\crash-reports\crash-2019-11-13_09.12.15-server.txt
[09:12:15] [Server thread/INFO] [minecraft/MinecraftServer]: Stopping server
[09:12:15] [Server thread/INFO] [minecraft/MinecraftServer]: Saving players
[09:12:15] [Server thread/ERROR] [minecraft/MinecraftServer]: Exception stopping the server
net.minecraft.util.ReportedException: Saving entity NBT
	at net.minecraft.entity.Entity.writeToNBT(Entity.java:1988) ~[Entity.class:?]
	at net.minecraft.server.integrated.IntegratedPlayerList.writePlayerData(IntegratedPlayerList.java:30) ~[IntegratedPlayerList.class:?]
	at net.minecraft.server.management.PlayerList.saveAllPlayerData(PlayerList.java:1000) ~[PlayerList.class:?]
	at net.minecraft.server.MinecraftServer.stopServer(MinecraftServer.java:493) ~[MinecraftServer.class:?]
	at net.minecraft.server.integrated.IntegratedServer.stopServer(IntegratedServer.java:413) ~[IntegratedServer.class:?]
	at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:645) [MinecraftServer.class:?]
	at java.lang.Thread.run(Unknown Source) [?:1.8.0_221]
Caused by: java.lang.NullPointerException
	at net.minecraft.potion.PotionEffect.getCurativeItems(PotionEffect.java:286) ~[PotionEffect.class:?]
	at net.minecraft.potion.PotionEffect.writeCurativeItems(PotionEffect.java:333) ~[PotionEffect.class:?]
	at net.minecraft.potion.PotionEffect.writeCustomPotionEffectToNBT(PotionEffect.java:219) ~[PotionEffect.class:?]
	at net.minecraft.entity.EntityLivingBase.writeEntityToNBT(EntityLivingBase.java:614) ~[EntityLivingBase.class:?]
	at net.minecraft.entity.player.EntityPlayer.writeEntityToNBT(EntityPlayer.java:1021) ~[EntityPlayer.class:?]
	at net.minecraft.entity.player.EntityPlayerMP.writeEntityToNBT(EntityPlayerMP.java:275) ~[EntityPlayerMP.class:?]
	at net.minecraft.entity.Entity.writeToNBT(Entity.java:1959) ~[Entity.class:?]
	... 6 more
[09:12:16] [Server thread/INFO] [FML]: Applying holder lookups
[09:12:16] [Server thread/INFO] [FML]: Holder lookups appliedjava.lang.NullPointerException: Ticking player
	at net.minecraft.potion.PotionEffect.onUpdate(PotionEffect.java:127)
	at net.minecraft.entity.EntityLivingBase.updatePotionEffects(EntityLivingBase.java:688)
	at net.minecraft.entity.EntityLivingBase.onEntityUpdate(EntityLivingBase.java:406)
	at net.minecraft.entity.Entity.onUpdate(Entity.java:466)
	at net.minecraft.entity.EntityLivingBase.onUpdate(EntityLivingBase.java:2315)
	at net.minecraft.entity.player.EntityPlayer.onUpdate(EntityPlayer.java:272)
	at net.minecraft.entity.player.EntityPlayerMP.onUpdateEntity(EntityPlayerMP.java:423)
	at net.minecraft.network.NetHandlerPlayServer.update(NetHandlerPlayServer.java:185)
	at net.minecraftforge.fml.common.network.handshake.NetworkDispatcher$1.update(NetworkDispatcher.java:212)
	at net.minecraft.network.NetworkManager.processReceivedPackets(NetworkManager.java:307)
	at net.minecraft.network.NetworkSystem.networkTick(NetworkSystem.java:197)
	at net.minecraft.server.MinecraftServer.updateTimeLightAndEntities(MinecraftServer.java:865)
	at net.minecraft.server.MinecraftServer.tick(MinecraftServer.java:743)
	at net.minecraft.server.integrated.IntegratedServer.tick(IntegratedServer.java:192)
	at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:592)
	at java.lang.Thread.run(Unknown Source)

Edited November 13, 20195 yr by NoHaxJustLegit

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1.12 NPE trying to add a potion effect that doesn't exists

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