--- a/net/minecraft/server/BehaviorUtil.java
+++ b/net/minecraft/server/BehaviorUtil.java
@@ -31,7 +31,7 @@
     }
 
     public static void c(EntityLiving entityliving, EntityLiving entityliving1) {
-        entityliving.getBehaviorController().setMemory(MemoryModuleType.LOOK_TARGET, (Object) (new BehaviorPositionEntity(entityliving1)));
+        entityliving.getBehaviorController().setMemory(MemoryModuleType.LOOK_TARGET, (new BehaviorPositionEntity(entityliving1))); // CraftBukkit - decompile error
     }
 
     public static void d(EntityLiving entityliving, EntityLiving entityliving1) {
@@ -46,11 +46,12 @@
         BehaviorPositionEntity behaviorpositionentity = new BehaviorPositionEntity(entityliving1);
         MemoryTarget memorytarget = new MemoryTarget(behaviorpositionentity, f, i);
 
-        entityliving.getBehaviorController().setMemory(MemoryModuleType.LOOK_TARGET, (Object) behaviorpositionentity);
-        entityliving.getBehaviorController().setMemory(MemoryModuleType.WALK_TARGET, (Object) memorytarget);
+        entityliving.getBehaviorController().setMemory(MemoryModuleType.LOOK_TARGET, behaviorpositionentity); // CraftBukkit - decompile error
+        entityliving.getBehaviorController().setMemory(MemoryModuleType.WALK_TARGET, memorytarget); // CraftBukkit - decompile error
     }
 
     public static void a(EntityLiving entityliving, ItemStack itemstack, EntityLiving entityliving1) {
+        if (itemstack.isEmpty()) return; // CraftBukkit - SPIGOT-4940: no empty loot
         double d0 = entityliving.locY - 0.30000001192092896D + (double) entityliving.getHeadHeight();
         EntityItem entityitem = new EntityItem(entityliving.world, entityliving.locX, d0, entityliving.locZ, itemstack);
         BlockPosition blockposition = new BlockPosition(entityliving1);
@@ -66,7 +67,7 @@
 
     public static SectionPosition a(WorldServer worldserver, SectionPosition sectionposition, int i) {
         int j = worldserver.b(sectionposition);
-        Stream stream = SectionPosition.a(sectionposition, i).filter((sectionposition1) -> {
+        Stream<SectionPosition> stream = SectionPosition.a(sectionposition, i).filter((sectionposition1) -> { // CraftBukkit - decompile error
             return worldserver.b(sectionposition1) < j;
         });