Paper/nms-patches/EntityIronGolem.patch

--- a/net/minecraft/server/EntityIronGolem.java
+++ b/net/minecraft/server/EntityIronGolem.java
@@ -28,8 +28,12 @@
         this.goalSelector.a(8, new PathfinderGoalRandomLookaround(this));
         this.targetSelector.a(1, new PathfinderGoalDefendVillage(this));
         this.targetSelector.a(2, new PathfinderGoalHurtByTarget(this, false, new Class[0]));
-        this.targetSelector.a(3, new PathfinderGoalNearestAttackableTarget(this, EntityInsentient.class, 10, false, true, (entityinsentient) -> {
-            return entityinsentient != null && IMonster.e.test(entityinsentient) && !(entityinsentient instanceof EntityCreeper);
+        // CraftBukkit start - decompile error
+        this.targetSelector.a(3, new PathfinderGoalNearestAttackableTarget(this, EntityInsentient.class, 10, false, true, new Predicate<EntityInsentient>() {
+            public boolean test(@Nullable EntityInsentient entityinsentient) {
+                return entityinsentient != null && IMonster.e.test(entityinsentient) && !(entityinsentient instanceof EntityCreeper);
+            }
+            // CraftBukkit end
         }));
     }
 
@@ -67,7 +71,7 @@
 
     protected void C(Entity entity) {
         if (entity instanceof IMonster && !(entity instanceof EntityCreeper) && this.getRandom().nextInt(20) == 0) {
-            this.setGoalTarget((EntityLiving) entity);
+            this.setGoalTarget((EntityLiving) entity, org.bukkit.event.entity.EntityTargetLivingEntityEvent.TargetReason.COLLISION, true); // CraftBukkit - set reason
         }
 
         super.C(entity);