1.3.1 Error

wumpyc · Aug 3, 2012

This error appears:

Code:

2012-08-03 17:04:34 [SEVERE] java.lang.NullPointerException
 
2012-08-03 17:04:34 [SEVERE]    at net.minecraft.server.ItemTool.a(SourceFile:40)
 
2012-08-03 17:04:34 [SEVERE]    at net.minecraft.server.ItemStack.a(ItemStack.java:206)
 
2012-08-03 17:04:34 [SEVERE]    at net.minecraft.server.ItemInWorldManager.breakBlock(ItemInWorldManager.java:286)
 
2012-08-03 17:04:34 [SEVERE]    at net.minecraft.server.ItemInWorldManager.a(ItemInWorldManager.java:87)
 
2012-08-03 17:04:34 [SEVERE]    at net.minecraft.server.EntityPlayer.h_(EntityPlayer.java:139)
 
2012-08-03 17:04:34 [SEVERE]    at net.minecraft.server.World.entityJoinedWorld(World.java:1219)
 
2012-08-03 17:04:34 [SEVERE]    at net.minecraft.server.WorldServer.entityJoinedWorld(WorldServer.java:498)
 
2012-08-03 17:04:34 [SEVERE]    at net.minecraft.server.World.playerJoinedWorld(World.java:1201)
 
2012-08-03 17:04:34 [SEVERE]    at net.minecraft.server.World.tickEntities(World.java:1106)
 
2012-08-03 17:04:34 [SEVERE]    at net.minecraft.server.MinecraftServer.q(MinecraftServer.java:543)
 
2012-08-03 17:04:34 [SEVERE]    at net.minecraft.server.DedicatedServer.q(DedicatedServer.java:212)
 
2012-08-03 17:04:34 [SEVERE]    at net.minecraft.server.MinecraftServer.p(MinecraftServer.java:474)
 
2012-08-03 17:04:34 [SEVERE]    at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:406)
 
2012-08-03 17:04:34 [SEVERE]    at net.minecraft.server.ThreadServerApplication.run(SourceFile:539)
 
2012-08-03 17:04:34 [SEVERE] Encountered an unexpected exception NullPointerException
 
java.lang.NullPointerException
 
    at net.minecraft.server.ItemTool.a(SourceFile:40)
 
    at net.minecraft.server.ItemStack.a(ItemStack.java:206)
 
    at net.minecraft.server.ItemInWorldManager.breakBlock(ItemInWorldManager.java:286)
 
    at net.minecraft.server.ItemInWorldManager.a(ItemInWorldManager.java:87)
 
    at net.minecraft.server.EntityPlayer.h_(EntityPlayer.java:139)
 
    at net.minecraft.server.World.entityJoinedWorld(World.java:1219)
 
    at net.minecraft.server.WorldServer.entityJoinedWorld(WorldServer.java:498)
 
    at net.minecraft.server.World.playerJoinedWorld(World.java:1201)
 
    at net.minecraft.server.World.tickEntities(World.java:1106)
 
    at net.minecraft.server.MinecraftServer.q(MinecraftServer.java:543)
 
    at net.minecraft.server.DedicatedServer.q(DedicatedServer.java:212)
 
    at net.minecraft.server.MinecraftServer.p(MinecraftServer.java:474)
 
    at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:406)
 
    at net.minecraft.server.ThreadServerApplication.run(SourceFile:539)

pyraetos · Aug 3, 2012

Moved to proper forum.

wumpyc · Aug 3, 2012

I didn't really know where to post.. So can you tell me so i will know in future?

pyraetos · Aug 3, 2012

Right here, in Bukkit Help.

Recolance · Aug 3, 2012

I want to bump this as I'm getting th exact same thing

pyraetos · Aug 3, 2012

wumpyc Recolance What plugins are you using?

Recolance · May 27, 2016

Will post a pic of plugin list. About 30 of them. The ones that are .disabled are well.... disabled until a new update for them comes because the clearly caused issues with the dev build.
http://i.imgur.com/5D7iu.png

pyraetos said: ↑

wumpyc Recolance What plugins are you using?
Click to expand...

I'm assuming once the new RB comes out and plugin authors start updating to 1.3.1 this error will simmer away.
Of course I run a DevB and there will be issues running DevB, but it is an error that causes a crash report to be generated. I can send you the report if you'd like.

EDIT by Moderator: merged posts, please use the edit button instead of double posting.

pyraetos · Aug 3, 2012

Recolance said: ↑

I'm assuming once the new RB comes out and plugin authors start updating to 1.3.1 this error will simmer away.
Of course I run a DevB and there will be issues running DevB, but it is an error that causes a crash report to be generated. I can send you the report if you'd like.
Click to expand...

Having spoken with one of the Bukkit core developers,

the only way to trigger that is doing bad things in threads or having a null Block
Click to expand...

Meaning there could be a plugin screwing up the server by dangerous design. If this is only happening in 1.3, I'd say the best option is to stay up-to-date on CraftBukkit development builds, and update every plugin as often as possible.

Recolance · Aug 3, 2012

Thank you very much. I will do that.

wumpyc · Aug 3, 2012

We use pretty much the same plugins. And i think that error causes some kind of crash. After that the chat works fine, but the world just freezes and doesn't unfreeze until restart.. I visited some other server with 1.3.1 DevBuild too. And the error was the same. I just hope you guys will fix that in recommended build. Thank you ;D

lazertester · Aug 4, 2012

Same error here

Code:

2012-08-04 01:26:10 [SEVERE] java.lang.NullPointerException
2012-08-04 01:26:10 [SEVERE]at net.minecraft.server.ItemTool.a(SourceFile:40)
2012-08-04 01:26:10 [SEVERE]at net.minecraft.server.ItemStack.a(ItemStack.java:206)
2012-08-04 01:26:10 [SEVERE]at net.minecraft.server.ItemInWorldManager.breakBlock(ItemInWorldManager.java:286)
2012-08-04 01:26:10 [SEVERE]at net.minecraft.server.ItemInWorldManager.a(ItemInWorldManager.java:87)
2012-08-04 01:26:10 [SEVERE]at net.minecraft.server.EntityPlayer.h_(EntityPlayer.java:139)
2012-08-04 01:26:10 [SEVERE]at net.minecraft.server.World.entityJoinedWorld(World.java:1219)
2012-08-04 01:26:10 [SEVERE]at net.minecraft.server.WorldServer.entityJoinedWorld(WorldServer.java:498)
2012-08-04 01:26:10 [SEVERE]at net.minecraft.server.World.playerJoinedWorld(World.java:1201)
2012-08-04 01:26:10 [SEVERE]at net.minecraft.server.World.tickEntities(World.java:1106)
2012-08-04 01:26:10 [SEVERE]at net.minecraft.server.MinecraftServer.q(MinecraftServer.java:543)
2012-08-04 01:26:10 [SEVERE]at net.minecraft.server.DedicatedServer.q(DedicatedServer.java:212)
2012-08-04 01:26:10 [SEVERE]at net.minecraft.server.MinecraftServer.p(MinecraftServer.java:474)
2012-08-04 01:26:10 [SEVERE]at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:406)
2012-08-04 01:26:10 [SEVERE]at net.minecraft.server.ThreadServerApplication.run(SourceFile:539)
2012-08-04 01:26:10 [SEVERE] Encountered an unexpected exception NullPointerException
java.lang.NullPointerException
at net.minecraft.server.ItemTool.a(SourceFile:40)
at net.minecraft.server.ItemStack.a(ItemStack.java:206)
at net.minecraft.server.ItemInWorldManager.breakBlock(ItemInWorldManager.java:286)
at net.minecraft.server.ItemInWorldManager.a(ItemInWorldManager.java:87)
at net.minecraft.server.EntityPlayer.h_(EntityPlayer.java:139)
at net.minecraft.server.World.entityJoinedWorld(World.java:1219)
at net.minecraft.server.WorldServer.entityJoinedWorld(WorldServer.java:498)
at net.minecraft.server.World.playerJoinedWorld(World.java:1201)
at net.minecraft.server.World.tickEntities(World.java:1106)
at net.minecraft.server.MinecraftServer.q(MinecraftServer.java:543)
at net.minecraft.server.DedicatedServer.q(DedicatedServer.java:212)
at net.minecraft.server.MinecraftServer.p(MinecraftServer.java:474)
at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:406)
at net.minecraft.server.ThreadServerApplication.run(SourceFile:539)

What kind of "Bad things with threads" would cause this exact error on different servers? Many of our plugins are homegrown so I take personal responsibility for the cause of the error if it is my behavior, but I need to know what might cause it so I know where to look...

EDIT:

Update, I poked around my code and saw that this happened to my players when they broke a cobweb with a shovel, here's my block listener block break event:

Code:

 
@EventHandler (priority = EventPriority.HIGHEST)
    void onBlockBreakEvent( BlockBreakEvent e ) {
if (e.isCancelled()) {
            return;
        }
 
        Player player = e.getPlayer();
        Block broken = e.getBlock();
        if (((broken.getType().equals(Material.CACTUS)) || (broken.getType().equals(Material.WEB))) && (player != null))
        {
            if (!player.getItemInHand().getType().equals(Material.IRON_SPADE))
            {
                player.sendMessage(ChatColor.RED + "You need an iron shovel to break " + (broken.getType().name().toLowerCase()));
                e.setCancelled(true);
                return;
            }
 
            if(broken.getType().equals(Material.CACTUS)) {
                e.setCancelled(true);
                Block newBlock = getHighestCactus(broken);
                while(broken.getY() <= newBlock.getY()){
                    newBlock.setType(setTypeId(0));
                    newBlock = newBlock.getRelative(BlockFace.DOWN);
                }
            } else {
                      broken.setTypeId(0);
                      broken.getDrops().clear();
            }
        }
}

I changed that to the following:

Code:

 
@EventHandler (priority = EventPriority.HIGHEST)
    void onBlockBreakEvent( BlockBreakEvent e ) {
if (e.isCancelled()) {
            return;
        }
 
        Player player = e.getPlayer();
        Block broken = e.getBlock();
        if (((broken.getType().equals(Material.CACTUS)) || (broken.getType().equals(Material.WEB))) && (player != null))
        {
            if (!player.getItemInHand().getType().equals(Material.IRON_SPADE))
            {
                player.sendMessage(ChatColor.RED + "You need an iron shovel to break " + (broken.getType().name().toLowerCase()));
                e.setCancelled(true);
                return;
            }
 
            if(broken.getType().equals(Material.CACTUS)) {
                e.setCancelled(true);
                Block newBlock = getHighestCactus(broken);
                while(broken.getY() <= newBlock.getY()){
                    newBlock.setType(setTypeId(0));
                    newBlock = newBlock.getRelative(BlockFace.DOWN);
                }
            } else {
                    BlockState bs = broken.getState();
                    bs.setTypeId(0);
                    bs.update();
                    broken.getDrops().clear();
            }
        }
}

And the error stopped. Is block break somehow being handled on a separate thread now? This was working consistently in the past.

MineirosPT · Aug 4, 2012

soo?
any solution?

horrorduck123 · Aug 5, 2012

thank god am not the only

Code:

2012-08-05 02:11:45 [SEVERE] java.lang.NullPointerException
2012-08-05 02:11:45 [SEVERE]    at net.minecraft.server.ItemTool.a(SourceFile:40)
2012-08-05 02:11:45 [SEVERE]    at net.minecraft.server.ItemStack.a(ItemStack.java:206)
2012-08-05 02:11:45 [SEVERE]    at net.minecraft.server.ItemInWorldManager.breakBlock(ItemInWorldManager.java:286)
2012-08-05 02:11:45 [SEVERE]    at net.minecraft.server.ItemInWorldManager.a(ItemInWorldManager.java:87)
2012-08-05 02:11:45 [SEVERE]    at net.minecraft.server.EntityPlayer.h_(EntityPlayer.java:139)
2012-08-05 02:11:45 [SEVERE]    at net.minecraft.server.World.entityJoinedWorld(World.java:1239)
2012-08-05 02:11:45 [SEVERE]    at net.minecraft.server.WorldServer.entityJoinedWorld(WorldServer.java:498)
2012-08-05 02:11:45 [SEVERE]    at net.minecraft.server.World.playerJoinedWorld(World.java:1221)
2012-08-05 02:11:45 [SEVERE]    at net.minecraft.server.World.tickEntities(World.java:1119)
2012-08-05 02:11:45 [SEVERE]    at net.minecraft.server.MinecraftServer.q(MinecraftServer.java:567)
2012-08-05 02:11:45 [SEVERE]    at net.minecraft.server.DedicatedServer.q(DedicatedServer.java:212)
2012-08-05 02:11:45 [SEVERE]    at net.minecraft.server.MinecraftServer.p(MinecraftServer.java:476)
2012-08-05 02:11:45 [SEVERE]    at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:408)
2012-08-05 02:11:45 [SEVERE]    at net.minecraft.server.ThreadServerApplication.run(SourceFile:539)
2012-08-05 02:11:45 [SEVERE] Encountered an unexpected exception NullPointerException
java.lang.NullPointerException
    at net.minecraft.server.ItemTool.a(SourceFile:40)
    at net.minecraft.server.ItemStack.a(ItemStack.java:206)
    at net.minecraft.server.ItemInWorldManager.breakBlock(ItemInWorldManager.java:286)
    at net.minecraft.server.ItemInWorldManager.a(ItemInWorldManager.java:87)
    at net.minecraft.server.EntityPlayer.h_(EntityPlayer.java:139)
    at net.minecraft.server.World.entityJoinedWorld(World.java:1239)
    at net.minecraft.server.WorldServer.entityJoinedWorld(WorldServer.java:498)
    at net.minecraft.server.World.playerJoinedWorld(World.java:1221)
    at net.minecraft.server.World.tickEntities(World.java:1119)
    at net.minecraft.server.MinecraftServer.q(MinecraftServer.java:567)
    at net.minecraft.server.DedicatedServer.q(DedicatedServer.java:212)
    at net.minecraft.server.MinecraftServer.p(MinecraftServer.java:476)
    at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:408)
    at net.minecraft.server.ThreadServerApplication.run(SourceFile:539)

one i have the same error

gorbb · Aug 5, 2012

I've been getting the following error when users try to chop trees (using my QwickTree plugin)
Code:
Failed to handle packet: java.lang.NullPointerException
java.lang.NullPointerException
        at net.minecraft.server.ItemTool.a(SourceFile:40)
        at net.minecraft.server.ItemStack.a(ItemStack.java:206)
        at net.minecraft.server.ItemInWorldManager.breakBlock(ItemInWorldManager.java:286)
        at net.minecraft.server.ItemInWorldManager.a(ItemInWorldManager.java:205)
        at net.minecraft.server.NetServerHandler.a(NetServerHandler.java:546)
        at net.minecraft.server.Packet14BlockDig.handle(SourceFile:46)
        at net.minecraft.server.NetworkManager.b(NetworkManager.java:281)
        at net.minecraft.server.NetServerHandler.d(NetServerHandler.java:105)
        at net.minecraft.server.ServerConnection.b(SourceFile:35)
        at net.minecraft.server.DedicatedServerConnection.b(SourceFile:30)
        at net.minecraft.server.MinecraftServer.q(MinecraftServer.java:559)
        at net.minecraft.server.DedicatedServer.q(DedicatedServer.java:212)
        at net.minecraft.server.MinecraftServer.p(MinecraftServer.java:474)
        at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:406)
        at net.minecraft.server.ThreadServerApplication.run(SourceFile:539)
The user is then kicked with reason "Internal Server Error"
Going through the code for my plugin, I narrowed down the cause to the following line:
Code:
b.setTypeId(0);
Reading lazertester's example, I changed that to:
Code:
BlockState bs = b.getState();
bs.setTypeId(0);
bs.update();
But upon updating and reloading the server, nothing had changed, and the error was still occurring.

pyraetos said: ↑

the only way to trigger that is doing bad things in threads or having a null Block
Click to expand...

I have checked both of these suggestions of what can be the cause of it, and with no luck. I'm thinking that this could be something to do with the 1.3.1 update, the code works fine on 1.2.5 versions, and when setting the block ID to 0 on leaves, it works fine, just not with Logs.

Edit: This error doesn't happen when the player is in creative either

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1.3.1 Error

wumpyc

pyraetos

wumpyc

pyraetos

Recolance

pyraetos

Recolance

pyraetos

Recolance

wumpyc

lazertester

MineirosPT

horrorduck123

gorbb

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