--- a/net/minecraft/server/DefinedStructure.java
+++ b/net/minecraft/server/DefinedStructure.java
@@ -84,7 +84,7 @@
     }
 
     private void a(World world, BlockPosition blockposition, BlockPosition blockposition1) {
-        List<Entity> list = world.a(Entity.class, new AxisAlignedBB(blockposition, blockposition1), (entity) -> {
+        List<Entity> list = world.a(Entity.class, new AxisAlignedBB(blockposition, blockposition1), (java.util.function.Predicate) (entity) -> { // CraftBukkit - decompile error
             return !(entity instanceof EntityHuman);
         });
 
@@ -388,11 +388,13 @@
     }
 
     private static Optional<Entity> a(GeneratorAccess generatoraccess, NBTTagCompound nbttagcompound) {
-        try {
+        // CraftBukkit start
+        // try {
             return EntityTypes.a(nbttagcompound, generatoraccess.getMinecraftWorld());
-        } catch (Exception exception) {
-            return Optional.empty();
-        }
+        // } catch (Exception exception) {
+            // return Optional.empty();
+        // }
+        // CraftBukkit end
     }
 
     public BlockPosition a(EnumBlockRotation enumblockrotation) {
@@ -801,7 +803,7 @@
         public IBlockData a(int i) {
             IBlockData iblockdata = (IBlockData) this.b.fromId(i);
 
-            return iblockdata == null ? DefinedStructure.a.a : iblockdata;
+            return iblockdata == null ? a : iblockdata; // CraftBukkit - decompile error
         }
 
         public Iterator<IBlockData> iterator() {
