Paper/nms-patches/InventoryEnderChest.patch

--- a/net/minecraft/server/InventoryEnderChest.java
+++ b/net/minecraft/server/InventoryEnderChest.java
@@ -1,9 +1,49 @@
 package net.minecraft.server;
 
+// CraftBukkit start
+import java.util.List;
+import org.bukkit.craftbukkit.entity.CraftHumanEntity;
+import org.bukkit.entity.HumanEntity;
+// CraftBukkit end
+
 public class InventoryEnderChest extends InventorySubcontainer {
 
     private TileEntityEnderChest a;
 
+    // CraftBukkit start - add fields and methods
+    public List<HumanEntity> transaction = new java.util.ArrayList<HumanEntity>();
+    public org.bukkit.entity.Player player;
+    private int maxStack = MAX_STACK;
+
+    public ItemStack[] getContents() {
+        return this.items;
+    }
+
+    public void onOpen(CraftHumanEntity who) {
+        transaction.add(who);
+    }
+
+    public void onClose(CraftHumanEntity who) {
+        transaction.remove(who);
+    }
+
+    public List<HumanEntity> getViewers() {
+        return transaction;
+    }
+
+    public org.bukkit.inventory.InventoryHolder getOwner() {
+        return this.player;
+    }
+
+    public void setMaxStackSize(int size) {
+        maxStack = size;
+    }
+
+    public int getMaxStackSize() {
+        return maxStack;
+    }
+    // CraftBukkit end
+
     public InventoryEnderChest() {
         super("container.enderchest", false, 27);
     }