[PLUG-385] Wierd error appearing only for events file. Created: 05/Apr/20  Updated: 06/Apr/20  Resolved: 06/Apr/20

Status: Resolved
Project: SpigotPlugins
Component/s: None
Affects Version/s: None
Fix Version/s: None

Type: Bug Priority: Major
Reporter: Zachary Cohen Assignee: Unassigned
Resolution: Invalid Votes: 0
Labels: config, error, event

Version:  CraftBukkit version git-Spigot-21fe707-e1ebe52 (MC: 1.8.8) (Implementing API version 1.8.8-R0.1-SNAPSHOT)
Plugin: Custom plugin
Guidelines Read: Yes

 Description   

I am coding a plugin that checks if someone is invincible or not, then cancels a hit event if they are. It is giving a NPE error.

Here is the error:

9:07:56 PM [WARN] java.lang.NullPointerException
9:07:56 PM [WARN] at me.name.MyPlugin.Events.Events.onHitInSpawn(Events.java:24)
9:07:56 PM [WARN] at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
9:07:57 PM [WARN] at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
9:07:57 PM [WARN] at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
9:07:57 PM [WARN] at java.lang.reflect.Method.invoke(Method.java:498)
9:07:57 PM [WARN] at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:306)
9:07:57 PM [WARN] at org.bukkit.plugin.RegisteredListener.callEvent(RegisteredListener.java:62)
9:07:57 PM [WARN] at org.bukkit.plugin.SimplePluginManager.fireEvent(SimplePluginManager.java:502)
9:07:57 PM [WARN] at org.bukkit.plugin.SimplePluginManager.callEvent(SimplePluginManager.java:487)
9:07:57 PM [WARN] at org.bukkit.craftbukkit.v1_8_R3.event.CraftEventFactory.callEvent(CraftEventFactory.java:87)
9:07:57 PM [WARN] at org.bukkit.craftbukkit.v1_8_R3.event.CraftEventFactory.callEntityDamageEvent(CraftEventFactory.java:553)
9:07:57 PM [WARN] at org.bukkit.craftbukkit.v1_8_R3.event.CraftEventFactory.handleEntityDamageEvent(CraftEventFactory.java:466)
9:07:57 PM [WARN] at org.bukkit.craftbukkit.v1_8_R3.event.CraftEventFactory.handleLivingEntityDamageEvent(CraftEventFactory.java:585)
9:07:57 PM [WARN] at net.minecraft.server.v1_8_R3.EntityLiving.d(EntityLiving.java:1102)
9:07:57 PM [WARN] at net.minecraft.server.v1_8_R3.EntityHuman.d(EntityHuman.java:859)
9:07:57 PM [WARN] at net.minecraft.server.v1_8_R3.EntityLiving.damageEntity(EntityLiving.java:743)
9:07:57 PM [WARN] at net.minecraft.server.v1_8_R3.EntityHuman.damageEntity(EntityHuman.java:800)
9:07:57 PM [WARN] at net.minecraft.server.v1_8_R3.EntityPlayer.damageEntity(EntityPlayer.java:496)
9:07:57 PM [WARN] at net.minecraft.server.v1_8_R3.EntityHuman.attack(EntityHuman.java:1001)
9:07:57 PM [WARN] at net.minecraft.server.v1_8_R3.EntityPlayer.attack(EntityPlayer.java:1063)
9:07:57 PM [WARN] at net.minecraft.server.v1_8_R3.PlayerConnection.a(PlayerConnection.java:1355)
9:07:57 PM [WARN] at net.minecraft.server.v1_8_R3.PacketPlayInUseEntity.a(SourceFile:52)
9:07:57 PM [WARN] at net.minecraft.server.v1_8_R3.PacketPlayInUseEntity.a(SourceFile:11)
9:07:57 PM [WARN] at net.minecraft.server.v1_8_R3.PlayerConnectionUtils$1.run(SourceFile:13)
9:07:57 PM [WARN] at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
9:07:57 PM [WARN] at java.util.concurrent.FutureTask.run(FutureTask.java:266)
9:07:57 PM [WARN] at net.minecraft.server.v1_8_R3.SystemUtils.a(SourceFile:44)
9:07:57 PM [WARN] at net.minecraft.server.v1_8_R3.MinecraftServer.B(MinecraftServer.java:715)
9:07:57 PM [WARN] at net.minecraft.server.v1_8_R3.DedicatedServer.B(DedicatedServer.java:374)
9:07:57 PM [WARN] at net.minecraft.server.v1_8_R3.MinecraftServer.A(MinecraftServer.java:654)
9:07:57 PM [WARN] at net.minecraft.server.v1_8_R3.MinecraftServer.run(MinecraftServer.java:557)
9:07:57 PM [WARN] at java.lang.Thread.run(Thread.java:748)

Events class:

public class Events implements Listener {
	DesertMain main = DesertMain.getInstance;
	
	@EventHandler
	public void onHitInSpawn(EntityDamageByEntityEvent event) {
		try {
			if(event.getEntity().getLocation().getY() > 1) {
				if(event.getEntity() instanceof Player) {
					
					UUID uuid = event.getEntity().getUniqueId();
		
			
    if(main.getConfig().getBoolean("players." + event.getEntity().getUniqueId() + ".invincible") == true /* <- line with error*/) {
    	        			
                    //event.setCancelled(true); <- what i want to do.
						
	        		}
				}
			
		}
		} catch(Exception e) {
			e.printStackTrace();
		}
		
	}
}

Config.yml:

players:
  a082eaf8-2e8d-4b23-a041-a33ba8d25d5d:
    invincible: true
  6d496747-a53f-4011-8557-708f2cb9eda5:
    invincible: true

This is my commnds class, and the wierdest thing is that is accesses the same part of the config file using the same method, however it does not return an error while doing it. Only the events class does, but it is doing the same thing to get to it. Here it is:

DesertMain main = DesertMain.getInstance;
if(command.getName().equalsIgnoreCase("invincible")) {
                                 if(main.getConfig().getBoolean("players." +             p.getUniqueId() + ".invincible") == false) {
        			p.sendMessage(ChatColor.GREEN + "Made you invincible!");
        			main.getConfig().set("players." + p.getUniqueId() + ".invincible", true);
        			main.saveConfig();
        		} else {
        			main.getConfig().set("players." + p.getUniqueId() + ".invincible", false);
        			p.sendMessage(ChatColor.RED + "Turned off your invincibilty!");
        			main.saveConfig();
        		}
            }

Here is my main class which handles  the getInstance thing:

public static DesertMain getInstance;
	
	public void onEnable() {
		Bukkit.getPluginManager().registerEvents(new Events(), this);
		getInstance = this;
		getCommand("speed").setExecutor(new Commands());
		getCommand("invincible").setExecutor(new Commands());
		loadConfig();
	}

 

 Comments   
Comment by md_5 [ 06/Apr/20 ]

Use the forums for help developing your plugin

Comment by Zachary Cohen [ 05/Apr/20 ]

I just realized that i initialized events before the instance. 

Generated at Sat Dec 13 16:34:27 UTC 2025 using Jira 10.3.13#10030013-sha1:56dd970ae30ebfeda3a697d25be1f6388b68a422.