Errors appear when getting the contents of an empty inventory slot?

When I try to get the contents of an empty inventory slot:
event.getPlayer().getInventory().getItem(x).getType() == Material.AIR;
I receive a "Could not pass event" error, and the thread stops running.

I'm using the beta 1.6.2-R0.1 bukkit build.

Any ideas what's going wrong here?

 

Mind posting the error?

 

This is the exact error

20:04:23 [SEVERE] Could not pass event InventoryCloseEvent to HopperCraft v0.1
org.bukkit.event.EventException
at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.ja
va:427)
at org.bukkit.plugin.RegisteredListener.callEvent(RegisteredListener.jav
a:62)
at org.bukkit.plugin.SimplePluginManager.fireEvent(SimplePluginManager.j
ava:477)
at org.bukkit.plugin.SimplePluginManager.callEvent(SimplePluginManager.j
ava:462)
at org.bukkit.craftbukkit.v1_6_R2.event.CraftEventFactory.handleInventor
yCloseEvent(CraftEventFactory.java:682)
at net.minecraft.server.v1_6_R2.PlayerConnection.handleContainerClose(Pl
ayerConnection.java:1158)
at net.minecraft.server.v1_6_R2.Packet101CloseWindow.handle(SourceFile:1
7)
at net.minecraft.server.v1_6_R2.NetworkManager.b(NetworkManager.java:296
)
at net.minecraft.server.v1_6_R2.PlayerConnection.e(PlayerConnection.java
:116)
at net.minecraft.server.v1_6_R2.ServerConnection.b(SourceFile:37)
at net.minecraft.server.v1_6_R2.DedicatedServerConnection.b(SourceFile:3
0)
at net.minecraft.server.v1_6_R2.MinecraftServer.t(MinecraftServer.java:5
90)
at net.minecraft.server.v1_6_R2.DedicatedServer.t(DedicatedServer.java:2
26)
at net.minecraft.server.v1_6_R2.MinecraftServer.s(MinecraftServer.java:4
86)
at net.minecraft.server.v1_6_R2.MinecraftServer.run(MinecraftServer.java
:419)
at net.minecraft.server.v1_6_R2.ThreadServerApplication.run(SourceFile:5
82)
Caused by: java.lang.NullPointerException
at me.lemoncakecake.hoppercraft.CraftingTable.onInventoryClose(CraftingT
able.java:292)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.ja
va:425)
... 15 more
>

 

Lemoncakecake
Could you post your code?

 

With the first line being 292 (The line in question)

Code:java

if (inventory.getItem(1).getType() != Material.AIR) {
    craftingSlot1.put(workbench, inventory.getItem(1));
    Bukkit.getServer().getPlayer(event.getPlayer().getName()).sendMessage("Slot 1 is not empty"); //debug
} else {
    Bukkit.getServer().getPlayer(event.getPlayer().getName()).sendMessage("Slot 1 is empty");     //debug
}

 

Lemoncakecake
I think you are using the wrong event. When you close a crafting bench, it ejects all the items.

 

Lemoncakecake

Did you register the event?

Did you put "Implements Listener" After the class?

Is there and @EventHandler before the sub?

 

I seem to have found a solution by using:

Code:java

if (inventory.getItem(1) != null) {
    craftingSlot1.put(workbench, inventory.getItem(1));
}

I'm not sure why the other attempts didn't work, but for some reason this one did.

Thanks for all of you who tried to help!