Fixed NPE while clearing a slot

src/main/java/net/minecraft/server/EntityPlayerMP.java

@@ -209,6 +209,7 @@ public class EntityPlayerMP extends EntityPlayer implements ICrafting {
 
     public void a(int i, int j, int k) {
         U();
+        System.out.println("OPEN_WINDOW for WorkBench");
         a.b(((Packet) (new Packet100(bG, 1, "Crafting", 9))));
         ap = ((CraftingInventoryCB) (new CraftingInventoryWorkbenchCB(an, l, i, j, k)));
         ap.f = bG;
@@ -217,6 +218,7 @@ public class EntityPlayerMP extends EntityPlayer implements ICrafting {
 
     public void a(IInventory iinventory) {
         U();
+        System.out.println("OPEN_WINDOW for Chest");
         a.b(((Packet) (new Packet100(bG, 0, iinventory.b(), iinventory.h_()))));
         ap = ((CraftingInventoryCB) (new CraftingInventoryChestCB(((IInventory) (an)), iinventory)));
         ap.f = bG;
@@ -225,6 +227,7 @@ public class EntityPlayerMP extends EntityPlayer implements ICrafting {
 
     public void a(TileEntityFurnace tileentityfurnace) {
         U();
+        System.out.println("OPEN_WINDOW for Furnace");
         a.b(((Packet) (new Packet100(bG, 2, tileentityfurnace.b(), tileentityfurnace.h_()))));
         ap = ((CraftingInventoryCB) (new CraftingInventoryFurnaceCB(((IInventory) (an)), tileentityfurnace)));
         ap.f = bG;
@@ -233,6 +236,7 @@ public class EntityPlayerMP extends EntityPlayer implements ICrafting {
 
     public void a(TileEntityDispenser tileentitydispenser) {
         U();
+        System.out.println("OPEN_WINDOW for Dispenser");
         a.b(((Packet) (new Packet100(bG, 3, tileentitydispenser.b(), tileentitydispenser.h_()))));
         ap = ((CraftingInventoryCB) (new CraftingInventoryDispenserCB(((IInventory) (an)), tileentitydispenser)));
         ap.f = bG;
@@ -243,20 +247,26 @@ public class EntityPlayerMP extends EntityPlayer implements ICrafting {
         if (craftinginventorycb.a(i) instanceof SlotCrafting) {
             return;
         }
+        System.out.print("SET_SLOT for window: "+craftinginventorycb.f+" index: "+i+"and stack: "+itemstack);
         if (am) {
+            System.out.println(" -- NOT SEND!");
             return;
         } else {
+            System.out.println(" -- SEND!");
             a.b(((Packet) (new Packet103(craftinginventorycb.f, i, itemstack))));
             return;
         }
     }
 
     public void a(CraftingInventoryCB craftinginventorycb, List list) {
+        System.out.println("WINDOW_SLOTS for window: "+craftinginventorycb.f );
         a.b(((Packet) (new Packet104(craftinginventorycb.f, list))));
+        System.out.println("SET_SLOT for item in hand: "+i+"and stack: "+an.i());
         a.b(((Packet) (new Packet103(-1, -1, an.i()))));
     }
 
     public void a(CraftingInventoryCB craftinginventorycb, int i, int j) {
+        System.out.println(String.format("UPDATE_PROGRESS_BAR for window: %d [%d;%d]", craftinginventorycb.f, i, j));
         a.b(((Packet) (new Packet105(craftinginventorycb.f, i, j))));
     }
 

src/main/java/org/bukkit/craftbukkit/inventory/CraftInventory.java

@@ -43,8 +43,7 @@ public class CraftInventory implements org.bukkit.inventory.Inventory {
 
     public void setContents(ItemStack[] items) {
         if (getInventory().getContents().length != items.length) {
-            throw new IllegalArgumentException("Invalid inventory size; expected "
-                    + getInventory().getContents().length);
+            throw new IllegalArgumentException("Invalid inventory size; expected " + getInventory().getContents().length);
         }
 
         net.minecraft.server.ItemStack[] mcItems = getInventory().getContents();
@@ -54,15 +53,13 @@ public class CraftInventory implements org.bukkit.inventory.Inventory {
             if (item == null) {
                 mcItems[i] = null;
             } else {
-                mcItems[i] = new net.minecraft.server.ItemStack(
-                        item.getTypeId(), item.getAmount(), item.getDamage());
+                mcItems[i] = new net.minecraft.server.ItemStack( item.getTypeId(), item.getAmount(), item.getDamage());
             }
         }
     }
 
     public void setItem(int index, ItemStack item) {
-        getInventory().a(index, new net.minecraft.server.ItemStack(
-                item.getTypeId(), item.getAmount(), item.getDamage()));
+        getInventory().a(index, (item == null ? null : new net.minecraft.server.ItemStack( item.getTypeId(), item.getAmount(), item.getDamage())));
     }
 
     public boolean contains(int materialId) {