Null pointer in delayed task.

Heres my code:

Code:java

int errors = 0;
        for (Block b : blocks.keySet()){
            if (b.getType() != Material.AIR){
                errors++;
            }
        }
        if (errors < 10){
            for (Map.Entry<Block, Material> entry : blocks.entrySet()){
                Block b = entry.getKey();
                Material m = entry.getValue();
                b.setType(m);
            }
            Bukkit.getServer().getScheduler().scheduleSyncDelayedTask(plugin, new Runnable(){
                public void run(){
                    for (Block b : blocks.keySet()){
                        b.setType(Material.AIR);
                    }
                }
            }, 20 * 15);
        } else {
            p.sendMessage("You cannot place a safehouse here! " + errors);
        }

I am getting the following errors when it is suppose to change the building back into air.

Code:

[SIZE=10px][FONT=Monaco][COLOR=#f5f5f5]20:30:35 [WARNING] [test] Task #27 for test v0.1 generated an exception[/COLOR][/FONT][/SIZE]
[COLOR=#f5f5f5][FONT=Monaco][SIZE=10px]java.lang.NullPointerException[/SIZE][/FONT][/COLOR]
[COLOR=#f5f5f5][FONT=Monaco][SIZE=10px]at net.minecraft.server.v1_6_R3.Chunk.a(Chunk.java:383)[/SIZE][/FONT][/COLOR]
[COLOR=#f5f5f5][FONT=Monaco][SIZE=10px]at net.minecraft.server.v1_6_R3.World.setTypeIdAndData(World.java:301)[/SIZE][/FONT][/COLOR]
[COLOR=#f5f5f5][FONT=Monaco][SIZE=10px]at org.bukkit.craftbukkit.v1_6_R3.block.CraftBlock.setTypeId(CraftBlock.java:108)[/SIZE][/FONT][/COLOR]
[COLOR=#f5f5f5][FONT=Monaco][SIZE=10px]at org.bukkit.craftbukkit.v1_6_R3.block.CraftBlock.setType(CraftBlock.java:104)[/SIZE][/FONT][/COLOR]
[COLOR=#f5f5f5][FONT=Monaco][SIZE=10px]at com.github.epicshadow.test.SafeHouse$1.run(SafeHouse.java:374)[/SIZE][/FONT][/COLOR]
[COLOR=#f5f5f5][FONT=Monaco][SIZE=10px]at org.bukkit.craftbukkit.v1_6_R3.scheduler.CraftTask.run(CraftTask.java:53)[/SIZE][/FONT][/COLOR]
[COLOR=#f5f5f5][FONT=Monaco][SIZE=10px]at org.bukkit.craftbukkit.v1_6_R3.scheduler.CraftScheduler.mainThreadHeartbeat(CraftScheduler.java:345)[/SIZE][/FONT][/COLOR]
[COLOR=#f5f5f5][FONT=Monaco][SIZE=10px]at net.minecraft.server.v1_6_R3.MinecraftServer.t(MinecraftServer.java:524)[/SIZE][/FONT][/COLOR]
[COLOR=#f5f5f5][FONT=Monaco][SIZE=10px]at net.minecraft.server.v1_6_R3.DedicatedServer.t(DedicatedServer.java:227)[/SIZE][/FONT][/COLOR]
[COLOR=#f5f5f5][FONT=Monaco][SIZE=10px]at net.minecraft.server.v1_6_R3.MinecraftServer.s(MinecraftServer.java:488)[/SIZE][/FONT][/COLOR]
[COLOR=#f5f5f5][FONT=Monaco][SIZE=10px]at net.minecraft.server.v1_6_R3.MinecraftServer.run(MinecraftServer.java:421)[/SIZE][/FONT][/COLOR]
[COLOR=#f5f5f5][FONT=Monaco][SIZE=10px]at net.minecraft.server.v1_6_R3.ThreadServerApplication.run(SourceFile:583)[/SIZE][/FONT][/COLOR]

Any ideas why/possible solutions? Thanks

 

Notice:
at com.github.epicshadow.test.SafeHouse$1.run(SafeHouse.java:374)

Whats line 374?

 

Jake0oo0
Its this line

Code:java

b.setType(Material.AIR);

 

Amazing_kid Make sure the block, etc, isn't null, add a bit of debug to see if there's any issues.

 

Try this:

Code:java

        if(!b.getType().equals(Material.AIR)) {
 
            b.setType(Material.AIR);   
 
        }

 

Ok Thanks ill give it a try and let you know the result.

Jake0oo0 BenCS_

Just got this error:

Code:

21:53:30 [WARNING] Failed to handle packet for Nebula111/127.0.0.1: net.minecraft.server.v1_6_R3.ReportedException: Colliding entity with tile
net.minecraft.server.v1_6_R3.ReportedException: Colliding entity with tile
    at net.minecraft.server.v1_6_R3.EntityPlayer.h(EntityPlayer.java:282)
    at net.minecraft.server.v1_6_R3.PlayerConnection.a(PlayerConnection.java:343)
    at net.minecraft.server.v1_6_R3.Packet10Flying.handle(SourceFile:136)
    at net.minecraft.server.v1_6_R3.NetworkManager.b(NetworkManager.java:296)
    at net.minecraft.server.v1_6_R3.PlayerConnection.e(PlayerConnection.java:116)
    at net.minecraft.server.v1_6_R3.ServerConnection.b(SourceFile:37)
    at net.minecraft.server.v1_6_R3.DedicatedServerConnection.b(SourceFile:30)
    at net.minecraft.server.v1_6_R3.MinecraftServer.t(MinecraftServer.java:592)
    at net.minecraft.server.v1_6_R3.DedicatedServer.t(DedicatedServer.java:227)
    at net.minecraft.server.v1_6_R3.MinecraftServer.s(MinecraftServer.java:488)
    at net.minecraft.server.v1_6_R3.MinecraftServer.run(MinecraftServer.java:421)
    at net.minecraft.server.v1_6_R3.ThreadServerApplication.run(SourceFile:583)
Caused by: java.lang.NullPointerException
    at net.minecraft.server.v1_6_R3.Entity.D(Entity.java:734)
    at net.minecraft.server.v1_6_R3.Entity.move(Entity.java:677)
    at net.minecraft.server.v1_6_R3.EntityLiving.e(EntityLiving.java:1188)
    at net.minecraft.server.v1_6_R3.EntityHuman.e(EntityHuman.java:1229)
    at net.minecraft.server.v1_6_R3.EntityLiving.c(EntityLiving.java:1444)
    at net.minecraft.server.v1_6_R3.EntityHuman.c(EntityHuman.java:371)
    at net.minecraft.server.v1_6_R3.EntityLiving.l_(EntityLiving.java:1277)
    at net.minecraft.server.v1_6_R3.EntityHuman.l_(EntityHuman.java:157)
    at net.minecraft.server.v1_6_R3.EntityPlayer.h(EntityPlayer.java:228)
    ... 11 more

The client also said "Internal Error"

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

 

Is this having to do with portals? After a bit of googling thats what seems to come up.

 

Jake0oo0 What? It has nothing to do with portals. All it does is go through a hash map with blocks and materials and set the blocks to air.

 

Bump