Paper/nms-patches/TileEntityBeacon.patch

--- a/net/minecraft/server/TileEntityBeacon.java
+++ b/net/minecraft/server/TileEntityBeacon.java
@@ -9,6 +9,11 @@
 import java.util.Set;
 import javax.annotation.Nullable;
 
+// CraftBukkit start
+import org.bukkit.craftbukkit.entity.CraftHumanEntity;
+import org.bukkit.entity.HumanEntity;
+// CraftBukkit end
+
 public class TileEntityBeacon extends TileEntityContainer implements ITickable, IWorldInventory {
 
     public static final MobEffectList[][] a = new MobEffectList[][] { { MobEffects.FASTER_MOVEMENT, MobEffects.FASTER_DIG}, { MobEffects.RESISTANCE, MobEffects.JUMP}, { MobEffects.INCREASE_DAMAGE}, { MobEffects.REGENERATION}};
@@ -22,6 +27,30 @@
     private MobEffectList m;
     private ItemStack inventorySlot;
     private String o;
+    // CraftBukkit start - add fields and methods
+    public List<HumanEntity> transaction = new java.util.ArrayList<HumanEntity>();
+    private int maxStack = MAX_STACK;
+
+    public ItemStack[] getContents() {
+        return new ItemStack[] { this.inventorySlot };
+    }
+
+    public void onOpen(CraftHumanEntity who) {
+        transaction.add(who);
+    }
+
+    public void onClose(CraftHumanEntity who) {
+        transaction.remove(who);
+    }
+
+    public List<HumanEntity> getViewers() {
+        return transaction;
+    }
+
+    public void setMaxStackSize(int size) {
+        maxStack = size;
+    }
+    // CraftBukkit end
 
     public TileEntityBeacon() {}