World#spawnArrow should return an AbstractArrow now

src/main/java/org/bukkit/craftbukkit/CraftWorld.java

@@ -521,12 +521,12 @@ public class CraftWorld implements World {
     }
 
     @Override
-    public Arrow spawnArrow(Location loc, Vector velocity, float speed, float spread) {
+    public AbstractArrow spawnArrow(Location loc, Vector velocity, float speed, float spread) {
         return spawnArrow(loc, velocity, speed, spread, Arrow.class);
     }
 
     @Override
-    public <T extends Arrow> T spawnArrow(Location loc, Vector velocity, float speed, float spread, Class<T> clazz) {
+    public <T extends AbstractArrow> T spawnArrow(Location loc, Vector velocity, float speed, float spread, Class<T> clazz) {
         Validate.notNull(loc, "Can not spawn arrow with a null location");
         Validate.notNull(velocity, "Can not spawn arrow with a null velocity");
         Validate.notNull(clazz, "Can not spawn an arrow with no class");

src/main/java/org/bukkit/craftbukkit/util/Commodore.java

@@ -235,6 +235,12 @@ public class Commodore
                             super.visitMethodInsn( opcode, owner, name, "(I)Lorg/bukkit/map/MapView;", itf );
                             return;
                         }
+                        if ( owner.equals( "org/bukkit/World" ) && name.equals( "spawnArrow" ) )
+                        {
+                            // Should be same size on stack so just call other method
+                            super.visitMethodInsn( opcode, owner, name, desc.replace( "Lorg/bukkit/entity/Arrow;", "Lorg/bukkit/entity/AbstractArrow;" ), itf );
+                            return;
+                        }
 
                         if ( modern )
                         {