PaperMC/nms-patches/EntityTippedArrow.patch

--- a/net/minecraft/server/EntityTippedArrow.java
+++ b/net/minecraft/server/EntityTippedArrow.java
@@ -102,6 +102,25 @@
         }
     }
 
+    // CraftBukkit start accessor methods
+    public void refreshEffects() {
+        this.getDataWatcher().set(EntityTippedArrow.f, Integer.valueOf(PotionUtil.a((Collection) PotionUtil.a(this.potionRegistry, (Collection) this.effects))));
+    }
+
+    public String getType() {
+        return ((MinecraftKey) PotionRegistry.a.b(this.potionRegistry)).toString();
+    }
+
+    public void setType(String string) {
+        this.potionRegistry = PotionRegistry.a.get(new MinecraftKey(string));
+        this.datawatcher.set(EntityTippedArrow.f, Integer.valueOf(PotionUtil.a((Collection) PotionUtil.a(this.potionRegistry, (Collection) this.effects))));
+    }
+
+    public boolean isTipped() {
+        return !(this.effects.isEmpty() && this.potionRegistry == Potions.EMPTY);
+    }
+    // CraftBukkit end
+
     public int q() {
         return ((Integer) this.datawatcher.get(EntityTippedArrow.f)).intValue();
     }