Updated to Minecraft version 1.4

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

@@ -19,7 +19,7 @@ public class CraftInventory implements org.bukkit.inventory.Inventory {
     }
 
     public int getSize() {
-        return getInventory().m_();
+        return getInventory().q_();
     }
 
     public String getName() {
@@ -290,7 +290,7 @@ public class CraftInventory implements org.bukkit.inventory.Inventory {
     }
 
     private int getMaxItemStack() {
-        return getInventory().n_();
+        return getInventory().r_();
     }
 
     public void remove(int materialId) {

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

@@ -20,6 +20,6 @@ public class CraftSlot implements org.bukkit.inventory.Slot {
     }
 
     public ItemStack getItem() {
-        return new CraftItemStack( slot.b() );
+        return new CraftItemStack( slot.a() );
     }
 }