Added Entity and serialization options to the NBT

NMS/NMS-API/src/com/songoda/core/nms/nbt/NBTCompound.java

@@ -22,4 +22,10 @@ public interface NBTCompound {
 
     NBTObject getNBTObject(String tag);
 
+    byte[] serialize(String... exclusions);
+
+    void deSerialize(byte[] serialized);
+
+    void addExtras();
+
 }

NMS/NMS-API/src/com/songoda/core/nms/nbt/NBTCore.java

@@ -1,11 +1,16 @@
 package com.songoda.core.nms.nbt;
 
+import org.bukkit.entity.Entity;
 import org.bukkit.inventory.ItemStack;
 
 public interface NBTCore {
 
     NBTItem of(ItemStack item);
 
-    NBTCompound newCompound();
+    NBTItem newItem();
+
+    NBTEntity of(Entity entity);
+
+    NBTEntity newEntity();
 
 }

NMS/NMS-API/src/com/songoda/core/nms/nbt/NBTEntity.java

@@ -0,0 +1,12 @@
+package com.songoda.core.nms.nbt;
+
+import org.bukkit.Location;
+import org.bukkit.entity.Entity;
+
+public interface NBTEntity extends NBTCompound {
+
+    Entity spawn(Location location);
+
+    Entity reSpawn(Location location);
+
+}

NMS/NMS-v1_10_R1/src/com/songoda/core/nms/v1_10_R1/nbt/NBTCompoundImpl.java

@@ -2,9 +2,12 @@ package com.songoda.core.nms.v1_10_R1.nbt;
 
 import com.songoda.core.nms.nbt.NBTCompound;
 import com.songoda.core.nms.nbt.NBTObject;
+import net.minecraft.server.v1_10_R1.NBTCompressedStreamTools;
 import net.minecraft.server.v1_10_R1.NBTTagCompound;
 
-public class NBTCompoundImpl implements NBTCompound {
+import java.io.*;
+
+public abstract class NBTCompoundImpl implements NBTCompound {
 
     protected NBTTagCompound compound;
 
@@ -74,4 +77,33 @@ public class NBTCompoundImpl implements NBTCompound {
         return new NBTObjectImpl(compound, tag);
     }
 
+    @Override
+    public byte[] serialize(String... exclusions) {
+        try (ByteArrayOutputStream outputStream = new ByteArrayOutputStream();
+             ObjectOutputStream dataOutput = new ObjectOutputStream(outputStream)) {
+            addExtras();
+            NBTTagCompound compound = this.compound.g(); // Changed in 1.12
+
+            for (String exclusion : exclusions)
+                compound.remove(exclusion);
+
+            NBTCompressedStreamTools.a(compound, (OutputStream) dataOutput);
+
+            return outputStream.toByteArray();
+        } catch (Exception e) {
+            e.printStackTrace();
+        }
+        return null;
+    }
+
+    @Override
+    public void deSerialize(byte[] serialized) {
+        try (ByteArrayInputStream inputStream = new ByteArrayInputStream(serialized);
+             ObjectInputStream dataInput = new ObjectInputStream(inputStream)) {
+            compound = NBTCompressedStreamTools.a((InputStream) dataInput);
+        } catch (Exception e) {
+            e.printStackTrace();
+        }
+    }
+
 }

NMS/NMS-v1_10_R1/src/com/songoda/core/nms/v1_10_R1/nbt/NBTCoreImpl.java

@@ -1,9 +1,12 @@
 package com.songoda.core.nms.v1_10_R1.nbt;
 
-import com.songoda.core.nms.nbt.NBTCompound;
 import com.songoda.core.nms.nbt.NBTCore;
+import com.songoda.core.nms.nbt.NBTEntity;
 import com.songoda.core.nms.nbt.NBTItem;
+import net.minecraft.server.v1_10_R1.NBTTagCompound;
+import org.bukkit.craftbukkit.v1_10_R1.entity.CraftEntity;
 import org.bukkit.craftbukkit.v1_10_R1.inventory.CraftItemStack;
+import org.bukkit.entity.Entity;
 import org.bukkit.inventory.ItemStack;
 
 public class NBTCoreImpl implements NBTCore {
@@ -14,8 +17,21 @@ public class NBTCoreImpl implements NBTCore {
     }
 
     @Override
-    public NBTCompound newCompound() {
+    public NBTItem newItem() {
-        return new NBTCompoundImpl();
+        return new NBTItemImpl(null);
+    }
+
+    @Override
+    public NBTEntity of(Entity entity) {
+        net.minecraft.server.v1_10_R1.Entity nmsEntity = ((CraftEntity) entity).getHandle();
+        NBTTagCompound nbt = new NBTTagCompound();
+        nmsEntity.e(nbt); // Method name changed in 1.11
+        return new NBTEntityImpl(nbt, nmsEntity);
+    }
+
+    @Override
+    public NBTEntity newEntity() {
+        return new NBTEntityImpl(new NBTTagCompound(), null);
     }
 
 }

NMS/NMS-v1_10_R1/src/com/songoda/core/nms/v1_10_R1/nbt/NBTEntityImpl.java

@@ -0,0 +1,52 @@
+package com.songoda.core.nms.v1_10_R1.nbt;
+
+import com.songoda.core.nms.nbt.NBTEntity;
+import net.minecraft.server.v1_10_R1.*;
+import org.bukkit.Location;
+import org.bukkit.craftbukkit.v1_10_R1.CraftWorld;
+import org.bukkit.event.entity.CreatureSpawnEvent;
+
+public class NBTEntityImpl extends NBTCompoundImpl implements NBTEntity {
+
+    private Entity nmsEntity;
+
+    public NBTEntityImpl(NBTTagCompound entityNBT, Entity nmsEntity) {
+        super(entityNBT);
+        this.nmsEntity = nmsEntity;
+    }
+
+    @Override
+    public org.bukkit.entity.Entity spawn(Location location) {
+        String entityType = getNBTObject("entity_type").asString();
+
+            Entity spawned = ItemMonsterEgg.spawnCreature( // Changed since 1.14
+                    ((CraftWorld) location.getWorld()).getHandle(),
+                    entityType, // Parameter simplified in 1.10
+                    location.getBlockX(), location.getBlockY(), location.getBlockZ(),
+                    CreatureSpawnEvent.SpawnReason.DEFAULT
+            );
+
+            if (spawned != null) {
+                spawned.f(compound); // This changed from 1.16.1
+                org.bukkit.entity.Entity entity = spawned.getBukkitEntity();
+                spawned.setLocation(location.getX(), location.getY(), location.getZ(),
+                        location.getPitch(), location.getYaw());
+                nmsEntity = spawned;
+                return entity;
+            }
+        return null;
+    }
+
+    @Override
+    public org.bukkit.entity.Entity reSpawn(Location location) {
+        nmsEntity.dead = true;
+        return spawn(location);
+    }
+
+    @Override
+    public void addExtras() {
+        String key = EntityTypes.b(nmsEntity); // Changed in 1.12
+        if (key != null)
+            compound.setString("entity_type", key); // Changed in 1.13
+    }
+}

NMS/NMS-v1_10_R1/src/com/songoda/core/nms/v1_10_R1/nbt/NBTItemImpl.java

@@ -2,6 +2,7 @@ package com.songoda.core.nms.v1_10_R1.nbt;
 
 import com.songoda.core.nms.nbt.NBTItem;
 import net.minecraft.server.v1_10_R1.NBTTagCompound;
+import org.bukkit.Material;
 import org.bukkit.craftbukkit.v1_10_R1.inventory.CraftItemStack;
 import org.bukkit.inventory.ItemStack;
 
@@ -10,11 +11,21 @@ public class NBTItemImpl extends NBTCompoundImpl implements NBTItem {
     private net.minecraft.server.v1_10_R1.ItemStack nmsItem;
 
     public NBTItemImpl(net.minecraft.server.v1_10_R1.ItemStack nmsItem) {
-        super(nmsItem.hasTag() ? nmsItem.getTag() : new NBTTagCompound());
+        super(nmsItem != null && nmsItem.hasTag() ? nmsItem.getTag() : new NBTTagCompound());
         this.nmsItem = nmsItem;
     }
 
     public ItemStack finish() {
-        return CraftItemStack.asBukkitCopy(nmsItem);
+        if (nmsItem == null) {
+            net.minecraft.server.v1_10_R1.ItemStack itemStack = CraftItemStack.asNMSCopy(new ItemStack(Material.STONE));
+            itemStack.setTag(compound);
+            return CraftItemStack.asBukkitCopy(nmsItem);
+        } else {
+            return CraftItemStack.asBukkitCopy(nmsItem);
+        }
+    }
+
+    @Override
+    public void addExtras() {
     }
 }

NMS/NMS-v1_11_R1/src/com/songoda/core/nms/v1_11_R1/nbt/NBTCompoundImpl.java

@@ -2,9 +2,12 @@ package com.songoda.core.nms.v1_11_R1.nbt;
 
 import com.songoda.core.nms.nbt.NBTCompound;
 import com.songoda.core.nms.nbt.NBTObject;
+import net.minecraft.server.v1_11_R1.NBTCompressedStreamTools;
 import net.minecraft.server.v1_11_R1.NBTTagCompound;
 
-public class NBTCompoundImpl implements NBTCompound {
+import java.io.*;
+
+public abstract class NBTCompoundImpl implements NBTCompound {
 
     protected NBTTagCompound compound;
 
@@ -74,4 +77,33 @@ public class NBTCompoundImpl implements NBTCompound {
         return new NBTObjectImpl(compound, tag);
     }
 
+    @Override
+    public byte[] serialize(String... exclusions) {
+        try (ByteArrayOutputStream outputStream = new ByteArrayOutputStream();
+             ObjectOutputStream dataOutput = new ObjectOutputStream(outputStream)) {
+            addExtras();
+            NBTTagCompound compound = this.compound.g(); // Changed in 1.12
+
+            for (String exclusion : exclusions)
+                compound.remove(exclusion);
+
+            NBTCompressedStreamTools.a(compound, (OutputStream) dataOutput);
+
+            return outputStream.toByteArray();
+        } catch (Exception e) {
+            e.printStackTrace();
+        }
+        return null;
+    }
+
+    @Override
+    public void deSerialize(byte[] serialized) {
+        try (ByteArrayInputStream inputStream = new ByteArrayInputStream(serialized);
+             ObjectInputStream dataInput = new ObjectInputStream(inputStream)) {
+            compound = NBTCompressedStreamTools.a((InputStream) dataInput);
+        } catch (Exception e) {
+            e.printStackTrace();
+        }
+    }
+
 }

NMS/NMS-v1_11_R1/src/com/songoda/core/nms/v1_11_R1/nbt/NBTCoreImpl.java

@@ -1,9 +1,12 @@
 package com.songoda.core.nms.v1_11_R1.nbt;
 
-import com.songoda.core.nms.nbt.NBTCompound;
 import com.songoda.core.nms.nbt.NBTCore;
+import com.songoda.core.nms.nbt.NBTEntity;
 import com.songoda.core.nms.nbt.NBTItem;
+import net.minecraft.server.v1_11_R1.NBTTagCompound;
+import org.bukkit.craftbukkit.v1_11_R1.entity.CraftEntity;
 import org.bukkit.craftbukkit.v1_11_R1.inventory.CraftItemStack;
+import org.bukkit.entity.Entity;
 import org.bukkit.inventory.ItemStack;
 
 public class NBTCoreImpl implements NBTCore {
@@ -14,8 +17,21 @@ public class NBTCoreImpl implements NBTCore {
     }
 
     @Override
-    public NBTCompound newCompound() {
+    public NBTItem newItem() {
-        return new NBTCompoundImpl();
+        return new NBTItemImpl(null);
+    }
+
+    @Override
+    public NBTEntity of(Entity entity) {
+        net.minecraft.server.v1_11_R1.Entity nmsEntity = ((CraftEntity) entity).getHandle();
+        NBTTagCompound nbt = new NBTTagCompound();
+        nmsEntity.e(nbt); // Method name changed in 1.11
+        return new NBTEntityImpl(nbt, nmsEntity);
+    }
+
+    @Override
+    public NBTEntity newEntity() {
+        return new NBTEntityImpl(new NBTTagCompound(), null);
     }
 
 }

NMS/NMS-v1_11_R1/src/com/songoda/core/nms/v1_11_R1/nbt/NBTEntityImpl.java

@@ -0,0 +1,52 @@
+package com.songoda.core.nms.v1_11_R1.nbt;
+
+import com.songoda.core.nms.nbt.NBTEntity;
+import net.minecraft.server.v1_11_R1.*;
+import org.bukkit.Location;
+import org.bukkit.craftbukkit.v1_11_R1.CraftWorld;
+import org.bukkit.event.entity.CreatureSpawnEvent;
+
+public class NBTEntityImpl extends NBTCompoundImpl implements NBTEntity {
+
+    private Entity nmsEntity;
+
+    public NBTEntityImpl(NBTTagCompound entityNBT, Entity nmsEntity) {
+        super(entityNBT);
+        this.nmsEntity = nmsEntity;
+    }
+
+    @Override
+    public org.bukkit.entity.Entity spawn(Location location) {
+        String entityType = getNBTObject("entity_type").asString();
+
+            Entity spawned = ItemMonsterEgg.spawnCreature( // Changed since 1.14
+                    ((CraftWorld) location.getWorld()).getHandle(),
+                    new MinecraftKey(entityType),
+                    location.getBlockX(), location.getBlockY(), location.getBlockZ(),
+                    CreatureSpawnEvent.SpawnReason.DEFAULT
+            );
+
+            if (spawned != null) {
+                spawned.f(compound); // This changed from 1.16.1
+                org.bukkit.entity.Entity entity = spawned.getBukkitEntity();
+                spawned.setLocation(location.getX(), location.getY(), location.getZ(),
+                        location.getPitch(), location.getYaw());
+                nmsEntity = spawned;
+                return entity;
+            }
+        return null;
+    }
+
+    @Override
+    public org.bukkit.entity.Entity reSpawn(Location location) {
+        nmsEntity.dead = true;
+        return spawn(location);
+    }
+
+    @Override
+    public void addExtras() {
+        String key = EntityTypes.b(nmsEntity); // Changed in 1.12
+        if (key != null)
+            compound.setString("entity_type", key); // Changed in 1.13
+    }
+}

NMS/NMS-v1_11_R1/src/com/songoda/core/nms/v1_11_R1/nbt/NBTItemImpl.java

@@ -2,6 +2,7 @@ package com.songoda.core.nms.v1_11_R1.nbt;
 
 import com.songoda.core.nms.nbt.NBTItem;
 import net.minecraft.server.v1_11_R1.NBTTagCompound;
+import org.bukkit.Material;
 import org.bukkit.craftbukkit.v1_11_R1.inventory.CraftItemStack;
 import org.bukkit.inventory.ItemStack;
 
@@ -10,11 +11,21 @@ public class NBTItemImpl extends NBTCompoundImpl implements NBTItem {
     private net.minecraft.server.v1_11_R1.ItemStack nmsItem;
 
     public NBTItemImpl(net.minecraft.server.v1_11_R1.ItemStack nmsItem) {
-        super(nmsItem.hasTag() ? nmsItem.getTag() : new NBTTagCompound());
+        super(nmsItem != null && nmsItem.hasTag() ? nmsItem.getTag() : new NBTTagCompound());
         this.nmsItem = nmsItem;
     }
 
     public ItemStack finish() {
-        return CraftItemStack.asBukkitCopy(nmsItem);
+        if (nmsItem == null) {
+            net.minecraft.server.v1_11_R1.ItemStack itemStack = CraftItemStack.asNMSCopy(new ItemStack(Material.STONE));
+            itemStack.setTag(compound);
+            return CraftItemStack.asBukkitCopy(nmsItem);
+        } else {
+            return CraftItemStack.asBukkitCopy(nmsItem);
+        }
+    }
+
+    @Override
+    public void addExtras() {
     }
 }

NMS/NMS-v1_12_R1/src/com/songoda/core/nms/v1_12_R1/nbt/NBTCompoundImpl.java

@@ -2,9 +2,12 @@ package com.songoda.core.nms.v1_12_R1.nbt;
 
 import com.songoda.core.nms.nbt.NBTCompound;
 import com.songoda.core.nms.nbt.NBTObject;
+import net.minecraft.server.v1_12_R1.NBTCompressedStreamTools;
 import net.minecraft.server.v1_12_R1.NBTTagCompound;
 
-public class NBTCompoundImpl implements NBTCompound {
+import java.io.*;
+
+public abstract class NBTCompoundImpl implements NBTCompound {
 
     protected NBTTagCompound compound;
 
@@ -74,4 +77,33 @@ public class NBTCompoundImpl implements NBTCompound {
         return new NBTObjectImpl(compound, tag);
     }
 
+    @Override
+    public byte[] serialize(String... exclusions) {
+        try (ByteArrayOutputStream outputStream = new ByteArrayOutputStream();
+             ObjectOutputStream dataOutput = new ObjectOutputStream(outputStream)) {
+            addExtras();
+            NBTTagCompound compound = this.compound.g(); // Changed in 1.12
+
+            for (String exclusion : exclusions)
+                compound.remove(exclusion);
+
+            NBTCompressedStreamTools.a(compound, (OutputStream) dataOutput);
+
+            return outputStream.toByteArray();
+        } catch (Exception e) {
+            e.printStackTrace();
+        }
+        return null;
+    }
+
+    @Override
+    public void deSerialize(byte[] serialized) {
+        try (ByteArrayInputStream inputStream = new ByteArrayInputStream(serialized);
+             ObjectInputStream dataInput = new ObjectInputStream(inputStream)) {
+            compound = NBTCompressedStreamTools.a((InputStream) dataInput);
+        } catch (Exception e) {
+            e.printStackTrace();
+        }
+    }
+
 }

NMS/NMS-v1_12_R1/src/com/songoda/core/nms/v1_12_R1/nbt/NBTCoreImpl.java

@@ -1,9 +1,12 @@
 package com.songoda.core.nms.v1_12_R1.nbt;
 
-import com.songoda.core.nms.nbt.NBTCompound;
 import com.songoda.core.nms.nbt.NBTCore;
+import com.songoda.core.nms.nbt.NBTEntity;
 import com.songoda.core.nms.nbt.NBTItem;
+import net.minecraft.server.v1_12_R1.NBTTagCompound;
+import org.bukkit.craftbukkit.v1_12_R1.entity.CraftEntity;
 import org.bukkit.craftbukkit.v1_12_R1.inventory.CraftItemStack;
+import org.bukkit.entity.Entity;
 import org.bukkit.inventory.ItemStack;
 
 public class NBTCoreImpl implements NBTCore {
@@ -14,8 +17,21 @@ public class NBTCoreImpl implements NBTCore {
     }
 
     @Override
-    public NBTCompound newCompound() {
+    public NBTItem newItem() {
-        return new NBTCompoundImpl();
+        return new NBTItemImpl(null);
+    }
+
+    @Override
+    public NBTEntity of(Entity entity) {
+        net.minecraft.server.v1_12_R1.Entity nmsEntity = ((CraftEntity) entity).getHandle();
+        NBTTagCompound nbt = new NBTTagCompound();
+        nmsEntity.save(nbt);
+        return new NBTEntityImpl(nbt, nmsEntity);
+    }
+
+    @Override
+    public NBTEntity newEntity() {
+        return new NBTEntityImpl(new NBTTagCompound(), null);
     }
 
 }

NMS/NMS-v1_12_R1/src/com/songoda/core/nms/v1_12_R1/nbt/NBTEntityImpl.java

@@ -0,0 +1,53 @@
+package com.songoda.core.nms.v1_12_R1.nbt;
+
+import com.songoda.core.nms.nbt.NBTEntity;
+import net.minecraft.server.v1_12_R1.*;
+import org.bukkit.Location;
+import org.bukkit.craftbukkit.v1_12_R1.CraftWorld;
+import org.bukkit.entity.EntityType;
+import org.bukkit.event.entity.CreatureSpawnEvent;
+
+public class NBTEntityImpl extends NBTCompoundImpl implements NBTEntity {
+
+    private Entity nmsEntity;
+
+    public NBTEntityImpl(NBTTagCompound entityNBT, Entity nmsEntity) {
+        super(entityNBT);
+        this.nmsEntity = nmsEntity;
+    }
+
+    @Override
+    public org.bukkit.entity.Entity spawn(Location location) {
+        String entityType = getNBTObject("entity_type").asString();
+
+            Entity spawned = ItemMonsterEgg.spawnCreature( // Changed since 1.14
+                    ((CraftWorld) location.getWorld()).getHandle(),
+                    new MinecraftKey(entityType),
+                    location.getBlockX(), location.getBlockY(), location.getBlockZ(),
+                    CreatureSpawnEvent.SpawnReason.DEFAULT
+            );
+
+            if (spawned != null) {
+                spawned.f(compound); // This changed from 1.16.1
+                org.bukkit.entity.Entity entity = spawned.getBukkitEntity();
+                spawned.setLocation(location.getX(), location.getY(), location.getZ(),
+                        location.getPitch(), location.getYaw());
+                nmsEntity = spawned;
+                return entity;
+            }
+        return null;
+    }
+
+    @Override
+    public org.bukkit.entity.Entity reSpawn(Location location) {
+        nmsEntity.dead = true;
+        return spawn(location);
+    }
+
+    @Override
+    public void addExtras() {
+        String key = EntityTypes.b(nmsEntity); // Changed in 1.12
+        if (key != null)
+            compound.setString("entity_type", key); // Changed in 1.13
+    }
+}

NMS/NMS-v1_12_R1/src/com/songoda/core/nms/v1_12_R1/nbt/NBTItemImpl.java

@@ -2,6 +2,7 @@ package com.songoda.core.nms.v1_12_R1.nbt;
 
 import com.songoda.core.nms.nbt.NBTItem;
 import net.minecraft.server.v1_12_R1.NBTTagCompound;
+import org.bukkit.Material;
 import org.bukkit.craftbukkit.v1_12_R1.inventory.CraftItemStack;
 import org.bukkit.inventory.ItemStack;
 
@@ -10,11 +11,21 @@ public class NBTItemImpl extends NBTCompoundImpl implements NBTItem {
     private net.minecraft.server.v1_12_R1.ItemStack nmsItem;
 
     public NBTItemImpl(net.minecraft.server.v1_12_R1.ItemStack nmsItem) {
-        super(nmsItem.hasTag() ? nmsItem.getTag() : new NBTTagCompound());
+        super(nmsItem != null && nmsItem.hasTag() ? nmsItem.getTag() : new NBTTagCompound());
         this.nmsItem = nmsItem;
     }
 
     public ItemStack finish() {
-        return CraftItemStack.asBukkitCopy(nmsItem);
+        if (nmsItem == null) {
+            net.minecraft.server.v1_12_R1.ItemStack itemStack = CraftItemStack.asNMSCopy(new ItemStack(Material.STONE));
+            itemStack.setTag(compound);
+            return CraftItemStack.asBukkitCopy(nmsItem);
+        } else {
+            return CraftItemStack.asBukkitCopy(nmsItem);
+        }
+    }
+
+    @Override
+    public void addExtras() {
     }
 }

NMS/NMS-v1_13_R1/src/com/songoda/core/nms/v1_13_R1/nbt/NBTCompoundImpl.java

@@ -2,9 +2,12 @@ package com.songoda.core.nms.v1_13_R1.nbt;
 
 import com.songoda.core.nms.nbt.NBTCompound;
 import com.songoda.core.nms.nbt.NBTObject;
+import net.minecraft.server.v1_13_R1.NBTCompressedStreamTools;
 import net.minecraft.server.v1_13_R1.NBTTagCompound;
 
-public class  NBTCompoundImpl implements NBTCompound {
+import java.io.*;
+
+public abstract class NBTCompoundImpl implements NBTCompound {
 
     protected NBTTagCompound compound;
 
@@ -74,4 +77,33 @@ public class  NBTCompoundImpl implements NBTCompound {
         return new NBTObjectImpl(compound, tag);
     }
 
+    @Override
+    public byte[] serialize(String... exclusions) {
+        try (ByteArrayOutputStream outputStream = new ByteArrayOutputStream();
+             ObjectOutputStream dataOutput = new ObjectOutputStream(outputStream)) {
+            addExtras();
+            NBTTagCompound compound = this.compound.clone();
+
+            for (String exclusion : exclusions)
+                compound.remove(exclusion);
+
+            NBTCompressedStreamTools.a(compound, (OutputStream) dataOutput);
+
+            return outputStream.toByteArray();
+        } catch (Exception e) {
+            e.printStackTrace();
+        }
+        return null;
+    }
+
+    @Override
+    public void deSerialize(byte[] serialized) {
+        try (ByteArrayInputStream inputStream = new ByteArrayInputStream(serialized);
+             ObjectInputStream dataInput = new ObjectInputStream(inputStream)) {
+            compound = NBTCompressedStreamTools.a((InputStream) dataInput);
+        } catch (Exception e) {
+            e.printStackTrace();
+        }
+    }
+
 }

NMS/NMS-v1_13_R1/src/com/songoda/core/nms/v1_13_R1/nbt/NBTCoreImpl.java

@@ -1,9 +1,12 @@
 package com.songoda.core.nms.v1_13_R1.nbt;
 
-import com.songoda.core.nms.nbt.NBTCompound;
 import com.songoda.core.nms.nbt.NBTCore;
+import com.songoda.core.nms.nbt.NBTEntity;
 import com.songoda.core.nms.nbt.NBTItem;
+import net.minecraft.server.v1_13_R1.NBTTagCompound;
+import org.bukkit.craftbukkit.v1_13_R1.entity.CraftEntity;
 import org.bukkit.craftbukkit.v1_13_R1.inventory.CraftItemStack;
+import org.bukkit.entity.Entity;
 import org.bukkit.inventory.ItemStack;
 
 public class NBTCoreImpl implements NBTCore {
@@ -14,8 +17,21 @@ public class NBTCoreImpl implements NBTCore {
     }
 
     @Override
-    public NBTCompound newCompound() {
+    public NBTItem newItem() {
-        return new NBTCompoundImpl();
+        return new NBTItemImpl(null);
+    }
+
+    @Override
+    public NBTEntity of(Entity entity) {
+        net.minecraft.server.v1_13_R1.Entity nmsEntity = ((CraftEntity) entity).getHandle();
+        NBTTagCompound nbt = new NBTTagCompound();
+        nmsEntity.save(nbt);
+        return new NBTEntityImpl(nbt, nmsEntity);
+    }
+
+    @Override
+    public NBTEntity newEntity() {
+        return new NBTEntityImpl(new NBTTagCompound(), null);
     }
 
 }

NMS/NMS-v1_13_R1/src/com/songoda/core/nms/v1_13_R1/nbt/NBTEntityImpl.java

@@ -0,0 +1,62 @@
+package com.songoda.core.nms.v1_13_R1.nbt;
+
+import com.songoda.core.nms.nbt.NBTEntity;
+import net.minecraft.server.v1_13_R1.*;
+import org.bukkit.Location;
+import org.bukkit.craftbukkit.v1_13_R1.CraftWorld;
+import org.bukkit.event.entity.CreatureSpawnEvent;
+
+import java.util.Optional;
+
+public class NBTEntityImpl extends NBTCompoundImpl implements NBTEntity {
+
+    private Entity nmsEntity;
+
+    public NBTEntityImpl(NBTTagCompound entityNBT, Entity nmsEntity) {
+        super(entityNBT);
+        this.nmsEntity = nmsEntity;
+    }
+
+    @Override
+    public org.bukkit.entity.Entity spawn(Location location) {
+        String entityType = getNBTObject("entity_type").asString();
+
+        Optional<EntityTypes<?>> optionalEntity = Optional.ofNullable(EntityTypes.a(entityType)); // Changed since 1.13.2
+        if (optionalEntity.isPresent()) {
+            Entity spawned = optionalEntity.get().spawnCreature(
+                    ((CraftWorld) location.getWorld()).getHandle(),
+                    compound,
+                    null,
+                    null,
+                    new BlockPosition(location.getBlockX(), location.getBlockY(), location.getBlockZ()),
+                    //EnumMobSpawn.COMMAND, // Changed since 1.14
+                    true,
+                    false,
+                    CreatureSpawnEvent.SpawnReason.DEFAULT
+            );
+
+            if (spawned != null) {
+                spawned.f(compound); // This changed from 1.16.1
+                org.bukkit.entity.Entity entity = spawned.getBukkitEntity();
+                spawned.setLocation(location.getX(), location.getY(), location.getZ(),
+                        location.getPitch(), location.getYaw());
+                nmsEntity = spawned;
+                return entity;
+            }
+        }
+        return null;
+    }
+
+    @Override
+    public org.bukkit.entity.Entity reSpawn(Location location) {
+        nmsEntity.dead = true;
+        return spawn(location);
+    }
+
+    @Override
+    public void addExtras() {
+        MinecraftKey key = EntityTypes.REGISTRY.b(nmsEntity.getEntityType());
+        if (key != null)
+            compound.setString("entity_type", key.toString()); // Changed in 1.13
+    }
+}

NMS/NMS-v1_13_R1/src/com/songoda/core/nms/v1_13_R1/nbt/NBTItemImpl.java

@@ -2,6 +2,7 @@ package com.songoda.core.nms.v1_13_R1.nbt;
 
 import com.songoda.core.nms.nbt.NBTItem;
 import net.minecraft.server.v1_13_R1.NBTTagCompound;
+import org.bukkit.Material;
 import org.bukkit.craftbukkit.v1_13_R1.inventory.CraftItemStack;
 import org.bukkit.inventory.ItemStack;
 
@@ -10,11 +11,21 @@ public class NBTItemImpl extends NBTCompoundImpl implements NBTItem {
     private net.minecraft.server.v1_13_R1.ItemStack nmsItem;
 
     public NBTItemImpl(net.minecraft.server.v1_13_R1.ItemStack nmsItem) {
-        super(nmsItem.hasTag() ? nmsItem.getTag() : new NBTTagCompound());
+        super(nmsItem != null && nmsItem.hasTag() ? nmsItem.getTag() : new NBTTagCompound());
         this.nmsItem = nmsItem;
     }
 
     public ItemStack finish() {
-        return CraftItemStack.asBukkitCopy(nmsItem);
+        if (nmsItem == null) {
+            net.minecraft.server.v1_13_R1.ItemStack itemStack = CraftItemStack.asNMSCopy(new ItemStack(Material.STONE));
+            itemStack.setTag(compound);
+            return CraftItemStack.asBukkitCopy(nmsItem);
+        } else {
+            return CraftItemStack.asBukkitCopy(nmsItem);
+        }
+    }
+
+    @Override
+    public void addExtras() {
     }
 }

NMS/NMS-v1_13_R2/src/com/songoda/core/nms/v1_13_R2/nbt/NBTCompoundImpl.java

@@ -2,9 +2,12 @@ package com.songoda.core.nms.v1_13_R2.nbt;
 
 import com.songoda.core.nms.nbt.NBTCompound;
 import com.songoda.core.nms.nbt.NBTObject;
+import net.minecraft.server.v1_13_R2.NBTCompressedStreamTools;
 import net.minecraft.server.v1_13_R2.NBTTagCompound;
 
-public class NBTCompoundImpl implements NBTCompound {
+import java.io.*;
+
+public abstract class NBTCompoundImpl implements NBTCompound {
 
     protected NBTTagCompound compound;
 
@@ -74,4 +77,33 @@ public class NBTCompoundImpl implements NBTCompound {
         return new NBTObjectImpl(compound, tag);
     }
 
+    @Override
+    public byte[] serialize(String... exclusions) {
+        try (ByteArrayOutputStream outputStream = new ByteArrayOutputStream();
+             ObjectOutputStream dataOutput = new ObjectOutputStream(outputStream)) {
+            addExtras();
+            NBTTagCompound compound = this.compound.clone();
+
+            for (String exclusion : exclusions)
+                compound.remove(exclusion);
+
+            NBTCompressedStreamTools.a(compound, (OutputStream) dataOutput);
+
+            return outputStream.toByteArray();
+        } catch (Exception e) {
+            e.printStackTrace();
+        }
+        return null;
+    }
+
+    @Override
+    public void deSerialize(byte[] serialized) {
+        try (ByteArrayInputStream inputStream = new ByteArrayInputStream(serialized);
+             ObjectInputStream dataInput = new ObjectInputStream(inputStream)) {
+            compound = NBTCompressedStreamTools.a((InputStream) dataInput);
+        } catch (Exception e) {
+            e.printStackTrace();
+        }
+    }
+
 }

NMS/NMS-v1_13_R2/src/com/songoda/core/nms/v1_13_R2/nbt/NBTCoreImpl.java

@@ -1,9 +1,12 @@
 package com.songoda.core.nms.v1_13_R2.nbt;
 
-import com.songoda.core.nms.nbt.NBTCompound;
 import com.songoda.core.nms.nbt.NBTCore;
+import com.songoda.core.nms.nbt.NBTEntity;
 import com.songoda.core.nms.nbt.NBTItem;
+import net.minecraft.server.v1_13_R2.NBTTagCompound;
+import org.bukkit.craftbukkit.v1_13_R2.entity.CraftEntity;
 import org.bukkit.craftbukkit.v1_13_R2.inventory.CraftItemStack;
+import org.bukkit.entity.Entity;
 import org.bukkit.inventory.ItemStack;
 
 public class NBTCoreImpl implements NBTCore {
@@ -14,8 +17,21 @@ public class NBTCoreImpl implements NBTCore {
     }
 
     @Override
-    public NBTCompound newCompound() {
+    public NBTItem newItem() {
-        return new NBTCompoundImpl();
+        return new NBTItemImpl(null);
+    }
+
+    @Override
+    public NBTEntity of(Entity entity) {
+        net.minecraft.server.v1_13_R2.Entity nmsEntity = ((CraftEntity) entity).getHandle();
+        NBTTagCompound nbt = new NBTTagCompound();
+        nmsEntity.save(nbt);
+        return new NBTEntityImpl(nbt, nmsEntity);
+    }
+
+    @Override
+    public NBTEntity newEntity() {
+        return new NBTEntityImpl(new NBTTagCompound(), null);
     }
 
 }

NMS/NMS-v1_13_R2/src/com/songoda/core/nms/v1_13_R2/nbt/NBTEntityImpl.java

@@ -0,0 +1,62 @@
+package com.songoda.core.nms.v1_13_R2.nbt;
+
+import com.songoda.core.nms.nbt.NBTEntity;
+import net.minecraft.server.v1_13_R2.*;
+import org.bukkit.Location;
+import org.bukkit.craftbukkit.v1_13_R2.CraftWorld;
+import org.bukkit.event.entity.CreatureSpawnEvent;
+
+import java.util.Optional;
+
+public class NBTEntityImpl extends NBTCompoundImpl implements NBTEntity {
+
+    private Entity nmsEntity;
+
+    public NBTEntityImpl(NBTTagCompound entityNBT, Entity nmsEntity) {
+        super(entityNBT);
+        this.nmsEntity = nmsEntity;
+    }
+
+    @Override
+    public org.bukkit.entity.Entity spawn(Location location) {
+        String entityType = getNBTObject("entity_type").asString();
+
+        Optional<EntityTypes<?>> optionalEntity = Optional.ofNullable(EntityTypes.a(entityType)); // Changed since 1.13.2
+        if (optionalEntity.isPresent()) {
+            Entity spawned = optionalEntity.get().spawnCreature(
+                    ((CraftWorld) location.getWorld()).getHandle(),
+                    compound,
+                    null,
+                    null,
+                    new BlockPosition(location.getBlockX(), location.getBlockY(), location.getBlockZ()),
+                    //EnumMobSpawn.COMMAND, // Changed since 1.13.2
+                    true,
+                    false,
+                    CreatureSpawnEvent.SpawnReason.DEFAULT
+            );
+
+            if (spawned != null) {
+                spawned.f(compound); // This changed from 1.16.1
+                org.bukkit.entity.Entity entity = spawned.getBukkitEntity();
+                spawned.setLocation(location.getX(), location.getY(), location.getZ(),
+                        location.getPitch(), location.getYaw());
+                nmsEntity = spawned;
+                return entity;
+            }
+        }
+        return null;
+    }
+
+    @Override
+    public org.bukkit.entity.Entity reSpawn(Location location) {
+        nmsEntity.dead = true;
+        return spawn(location);
+    }
+
+    @Override
+    public void addExtras() {
+        MinecraftKey key = IRegistry.ENTITY_TYPE.getKey(nmsEntity.P());
+        if (key != null)
+            compound.setString("entity_type", key.toString()); // Changed in 1.13
+    }
+}

NMS/NMS-v1_13_R2/src/com/songoda/core/nms/v1_13_R2/nbt/NBTItemImpl.java

@@ -2,6 +2,7 @@ package com.songoda.core.nms.v1_13_R2.nbt;
 
 import com.songoda.core.nms.nbt.NBTItem;
 import net.minecraft.server.v1_13_R2.NBTTagCompound;
+import org.bukkit.Material;
 import org.bukkit.craftbukkit.v1_13_R2.inventory.CraftItemStack;
 import org.bukkit.inventory.ItemStack;
 
@@ -10,11 +11,21 @@ public class NBTItemImpl extends NBTCompoundImpl implements NBTItem {
     private net.minecraft.server.v1_13_R2.ItemStack nmsItem;
 
     public NBTItemImpl(net.minecraft.server.v1_13_R2.ItemStack nmsItem) {
-        super(nmsItem.hasTag() ? nmsItem.getTag() : new NBTTagCompound());
+        super(nmsItem != null && nmsItem.hasTag() ? nmsItem.getTag() : new NBTTagCompound());
         this.nmsItem = nmsItem;
     }
 
     public ItemStack finish() {
-        return CraftItemStack.asBukkitCopy(nmsItem);
+        if (nmsItem == null) {
+            net.minecraft.server.v1_13_R2.ItemStack itemStack = CraftItemStack.asNMSCopy(new ItemStack(Material.STONE));
+            itemStack.setTag(compound);
+            return CraftItemStack.asBukkitCopy(nmsItem);
+        } else {
+            return CraftItemStack.asBukkitCopy(nmsItem);
+        }
+    }
+
+    @Override
+    public void addExtras() {
     }
 }

NMS/NMS-v1_14_R1/src/com/songoda/core/nms/v1_14_R1/nbt/NBTCompoundImpl.java

@@ -2,9 +2,12 @@ package com.songoda.core.nms.v1_14_R1.nbt;
 
 import com.songoda.core.nms.nbt.NBTCompound;
 import com.songoda.core.nms.nbt.NBTObject;
+import net.minecraft.server.v1_14_R1.NBTCompressedStreamTools;
 import net.minecraft.server.v1_14_R1.NBTTagCompound;
 
-public class NBTCompoundImpl implements NBTCompound {
+import java.io.*;
+
+public abstract class NBTCompoundImpl implements NBTCompound {
 
     protected NBTTagCompound compound;
 
@@ -74,4 +77,33 @@ public class NBTCompoundImpl implements NBTCompound {
         return new NBTObjectImpl(compound, tag);
     }
 
+    @Override
+    public byte[] serialize(String... exclusions) {
+        try (ByteArrayOutputStream outputStream = new ByteArrayOutputStream();
+             ObjectOutputStream dataOutput = new ObjectOutputStream(outputStream)) {
+            addExtras();
+            NBTTagCompound compound = this.compound.clone();
+
+            for (String exclusion : exclusions)
+                compound.remove(exclusion);
+
+            NBTCompressedStreamTools.a(compound, (OutputStream) dataOutput);
+
+            return outputStream.toByteArray();
+        } catch (Exception e) {
+            e.printStackTrace();
+        }
+        return null;
+    }
+
+    @Override
+    public void deSerialize(byte[] serialized) {
+        try (ByteArrayInputStream inputStream = new ByteArrayInputStream(serialized);
+             ObjectInputStream dataInput = new ObjectInputStream(inputStream)) {
+            compound = NBTCompressedStreamTools.a((InputStream) dataInput);
+        } catch (Exception e) {
+            e.printStackTrace();
+        }
+    }
+
 }

NMS/NMS-v1_14_R1/src/com/songoda/core/nms/v1_14_R1/nbt/NBTCoreImpl.java

@@ -1,9 +1,12 @@
 package com.songoda.core.nms.v1_14_R1.nbt;
 
-import com.songoda.core.nms.nbt.NBTCompound;
 import com.songoda.core.nms.nbt.NBTCore;
+import com.songoda.core.nms.nbt.NBTEntity;
 import com.songoda.core.nms.nbt.NBTItem;
+import net.minecraft.server.v1_14_R1.NBTTagCompound;
+import org.bukkit.craftbukkit.v1_14_R1.entity.CraftEntity;
 import org.bukkit.craftbukkit.v1_14_R1.inventory.CraftItemStack;
+import org.bukkit.entity.Entity;
 import org.bukkit.inventory.ItemStack;
 
 public class NBTCoreImpl implements NBTCore {
@@ -14,8 +17,21 @@ public class NBTCoreImpl implements NBTCore {
     }
 
     @Override
-    public NBTCompound newCompound() {
+    public NBTItem newItem() {
-        return new NBTCompoundImpl();
+        return new NBTItemImpl(null);
+    }
+
+    @Override
+    public NBTEntity of(Entity entity) {
+        net.minecraft.server.v1_14_R1.Entity nmsEntity = ((CraftEntity) entity).getHandle();
+        NBTTagCompound nbt = new NBTTagCompound();
+        nmsEntity.save(nbt);
+        return new NBTEntityImpl(nbt, nmsEntity);
+    }
+
+    @Override
+    public NBTEntity newEntity() {
+        return new NBTEntityImpl(new NBTTagCompound(), null);
     }
 
 }

NMS/NMS-v1_14_R1/src/com/songoda/core/nms/v1_14_R1/nbt/NBTEntityImpl.java

@@ -0,0 +1,58 @@
+package com.songoda.core.nms.v1_14_R1.nbt;
+
+import com.songoda.core.nms.nbt.NBTEntity;
+import net.minecraft.server.v1_14_R1.*;
+import org.bukkit.Location;
+import org.bukkit.craftbukkit.v1_14_R1.CraftWorld;
+
+import java.util.Optional;
+
+public class NBTEntityImpl extends NBTCompoundImpl implements NBTEntity {
+
+    private Entity nmsEntity;
+
+    public NBTEntityImpl(NBTTagCompound entityNBT, Entity nmsEntity) {
+        super(entityNBT);
+        this.nmsEntity = nmsEntity;
+    }
+
+    @Override
+    public org.bukkit.entity.Entity spawn(Location location) {
+        String entityType = getNBTObject("entity_type").asString();
+
+        Optional<EntityTypes<?>> optionalEntity = EntityTypes.a(entityType);
+        if (optionalEntity.isPresent()) {
+            Entity spawned = optionalEntity.get().spawnCreature(
+                    ((CraftWorld) location.getWorld()).getHandle(),
+                    compound,
+                    null,
+                    null,
+                    new BlockPosition(location.getBlockX(), location.getBlockY(), location.getBlockZ()),
+                    EnumMobSpawn.COMMAND,
+                    true,
+                    false
+            );
+
+            if (spawned != null) {
+                spawned.f(compound); // This changed from 1.16.1
+                org.bukkit.entity.Entity entity = spawned.getBukkitEntity();
+                spawned.setLocation(location.getX(), location.getY(), location.getZ(),
+                        location.getPitch(), location.getYaw());
+                nmsEntity = spawned;
+                return entity;
+            }
+        }
+        return null;
+    }
+
+    @Override
+    public org.bukkit.entity.Entity reSpawn(Location location) {
+        nmsEntity.dead = true;
+        return spawn(location);
+    }
+
+    @Override
+    public void addExtras() {
+        compound.setString("entity_type", IRegistry.ENTITY_TYPE.getKey(nmsEntity.getEntityType()).toString());
+    }
+}

NMS/NMS-v1_14_R1/src/com/songoda/core/nms/v1_14_R1/nbt/NBTItemImpl.java

@@ -2,6 +2,7 @@ package com.songoda.core.nms.v1_14_R1.nbt;
 
 import com.songoda.core.nms.nbt.NBTItem;
 import net.minecraft.server.v1_14_R1.NBTTagCompound;
+import org.bukkit.Material;
 import org.bukkit.craftbukkit.v1_14_R1.inventory.CraftItemStack;
 import org.bukkit.inventory.ItemStack;
 
@@ -10,11 +11,21 @@ public class NBTItemImpl extends NBTCompoundImpl implements NBTItem {
     private net.minecraft.server.v1_14_R1.ItemStack nmsItem;
 
     public NBTItemImpl(net.minecraft.server.v1_14_R1.ItemStack nmsItem) {
-        super(nmsItem.hasTag() ? nmsItem.getTag() : new NBTTagCompound());
+        super(nmsItem != null && nmsItem.hasTag() ? nmsItem.getTag() : new NBTTagCompound());
         this.nmsItem = nmsItem;
     }
 
     public ItemStack finish() {
-        return CraftItemStack.asBukkitCopy(nmsItem);
+        if (nmsItem == null) {
+            net.minecraft.server.v1_14_R1.ItemStack itemStack = CraftItemStack.asNMSCopy(new ItemStack(Material.STONE));
+            itemStack.setTag(compound);
+            return CraftItemStack.asBukkitCopy(nmsItem);
+        } else {
+            return CraftItemStack.asBukkitCopy(nmsItem);
+        }
+    }
+
+    @Override
+    public void addExtras() {
     }
 }

NMS/NMS-v1_15_R1/src/com/songoda/core/nms/v1_15_R1/nbt/NBTCompoundImpl.java

@@ -2,12 +2,12 @@ package com.songoda.core.nms.v1_15_R1.nbt;
 
 import com.songoda.core.nms.nbt.NBTCompound;
 import com.songoda.core.nms.nbt.NBTObject;
+import net.minecraft.server.v1_15_R1.NBTCompressedStreamTools;
 import net.minecraft.server.v1_15_R1.NBTTagCompound;
-import net.minecraft.server.v1_15_R1.NBTTagList;
 
-import java.util.List;
+import java.io.*;
 
-public class NBTCompoundImpl implements NBTCompound {
+public abstract class NBTCompoundImpl implements NBTCompound {
 
     protected NBTTagCompound compound;
 
@@ -77,4 +77,33 @@ public class NBTCompoundImpl implements NBTCompound {
         return new NBTObjectImpl(compound, tag);
     }
 
+    @Override
+    public byte[] serialize(String... exclusions) {
+        try (ByteArrayOutputStream outputStream = new ByteArrayOutputStream();
+             ObjectOutputStream dataOutput = new ObjectOutputStream(outputStream)) {
+            addExtras();
+            NBTTagCompound compound = this.compound.clone();
+
+            for (String exclusion : exclusions)
+                compound.remove(exclusion);
+
+            NBTCompressedStreamTools.a(compound, (OutputStream) dataOutput);
+
+            return outputStream.toByteArray();
+        } catch (Exception e) {
+            e.printStackTrace();
+        }
+        return null;
+    }
+
+    @Override
+    public void deSerialize(byte[] serialized) {
+        try (ByteArrayInputStream inputStream = new ByteArrayInputStream(serialized);
+             ObjectInputStream dataInput = new ObjectInputStream(inputStream)) {
+            compound = NBTCompressedStreamTools.a((InputStream) dataInput);
+        } catch (Exception e) {
+            e.printStackTrace();
+        }
+    }
+
 }

NMS/NMS-v1_15_R1/src/com/songoda/core/nms/v1_15_R1/nbt/NBTCoreImpl.java

@@ -1,9 +1,12 @@
 package com.songoda.core.nms.v1_15_R1.nbt;
 
-import com.songoda.core.nms.nbt.NBTCompound;
 import com.songoda.core.nms.nbt.NBTCore;
+import com.songoda.core.nms.nbt.NBTEntity;
 import com.songoda.core.nms.nbt.NBTItem;
+import net.minecraft.server.v1_15_R1.NBTTagCompound;
+import org.bukkit.craftbukkit.v1_15_R1.entity.CraftEntity;
 import org.bukkit.craftbukkit.v1_15_R1.inventory.CraftItemStack;
+import org.bukkit.entity.Entity;
 import org.bukkit.inventory.ItemStack;
 
 public class NBTCoreImpl implements NBTCore {
@@ -14,8 +17,21 @@ public class NBTCoreImpl implements NBTCore {
     }
 
     @Override
-    public NBTCompound newCompound() {
+    public NBTItem newItem() {
-        return new NBTCompoundImpl();
+        return new NBTItemImpl(null);
+    }
+
+    @Override
+    public NBTEntity of(Entity entity) {
+        net.minecraft.server.v1_15_R1.Entity nmsEntity = ((CraftEntity) entity).getHandle();
+        NBTTagCompound nbt = new NBTTagCompound();
+        nmsEntity.save(nbt);
+        return new NBTEntityImpl(nbt, nmsEntity);
+    }
+
+    @Override
+    public NBTEntity newEntity() {
+        return new NBTEntityImpl(new NBTTagCompound(), null);
     }
 
 }

NMS/NMS-v1_15_R1/src/com/songoda/core/nms/v1_15_R1/nbt/NBTEntityImpl.java

@@ -0,0 +1,58 @@
+package com.songoda.core.nms.v1_15_R1.nbt;
+
+import com.songoda.core.nms.nbt.NBTEntity;
+import net.minecraft.server.v1_15_R1.*;
+import org.bukkit.Location;
+import org.bukkit.craftbukkit.v1_15_R1.CraftWorld;
+
+import java.util.Optional;
+
+public class NBTEntityImpl extends NBTCompoundImpl implements NBTEntity {
+
+    private Entity nmsEntity;
+
+    public NBTEntityImpl(NBTTagCompound entityNBT, Entity nmsEntity) {
+        super(entityNBT);
+        this.nmsEntity = nmsEntity;
+    }
+
+    @Override
+    public org.bukkit.entity.Entity spawn(Location location) {
+        String entityType = getNBTObject("entity_type").asString();
+
+        Optional<EntityTypes<?>> optionalEntity = EntityTypes.a(entityType);
+        if (optionalEntity.isPresent()) {
+            Entity spawned = optionalEntity.get().spawnCreature(
+                    ((CraftWorld) location.getWorld()).getHandle(),
+                    compound,
+                    null,
+                    null,
+                    new BlockPosition(location.getBlockX(), location.getBlockY(), location.getBlockZ()),
+                    EnumMobSpawn.COMMAND,
+                    true,
+                    false
+            );
+
+            if (spawned != null) {
+                spawned.f(compound); // This changed from 1.16.1
+                org.bukkit.entity.Entity entity = spawned.getBukkitEntity();
+                spawned.setLocation(location.getX(), location.getY(), location.getZ(),
+                        location.getPitch(), location.getYaw());
+                nmsEntity = spawned;
+                return entity;
+            }
+        }
+        return null;
+    }
+
+    @Override
+    public org.bukkit.entity.Entity reSpawn(Location location) {
+        nmsEntity.dead = true;
+        return spawn(location);
+    }
+
+    @Override
+    public void addExtras() {
+        compound.setString("entity_type", IRegistry.ENTITY_TYPE.getKey(nmsEntity.getEntityType()).toString());
+    }
+}

NMS/NMS-v1_15_R1/src/com/songoda/core/nms/v1_15_R1/nbt/NBTItemImpl.java

@@ -2,6 +2,7 @@ package com.songoda.core.nms.v1_15_R1.nbt;
 
 import com.songoda.core.nms.nbt.NBTItem;
 import net.minecraft.server.v1_15_R1.NBTTagCompound;
+import org.bukkit.Material;
 import org.bukkit.craftbukkit.v1_15_R1.inventory.CraftItemStack;
 import org.bukkit.inventory.ItemStack;
 
@@ -10,11 +11,21 @@ public class NBTItemImpl extends NBTCompoundImpl implements NBTItem {
     private net.minecraft.server.v1_15_R1.ItemStack nmsItem;
 
     public NBTItemImpl(net.minecraft.server.v1_15_R1.ItemStack nmsItem) {
-        super(nmsItem.hasTag() ? nmsItem.getTag() : new NBTTagCompound());
+        super(nmsItem != null && nmsItem.hasTag() ? nmsItem.getTag() : new NBTTagCompound());
         this.nmsItem = nmsItem;
     }
 
     public ItemStack finish() {
-        return CraftItemStack.asBukkitCopy(nmsItem);
+        if (nmsItem == null) {
+            net.minecraft.server.v1_15_R1.ItemStack itemStack = CraftItemStack.asNMSCopy(new ItemStack(Material.STONE));
+            itemStack.setTag(compound);
+            return CraftItemStack.asBukkitCopy(nmsItem);
+        } else {
+            return CraftItemStack.asBukkitCopy(nmsItem);
+        }
+    }
+
+    @Override
+    public void addExtras() {
     }
 }

NMS/NMS-v1_16_R1/src/com/songoda/core/nms/v1_16_R1/nbt/NBTCompoundImpl.java

@@ -2,10 +2,12 @@ package com.songoda.core.nms.v1_16_R1.nbt;
 
 import com.songoda.core.nms.nbt.NBTCompound;
 import com.songoda.core.nms.nbt.NBTObject;
+import net.minecraft.server.v1_16_R1.NBTCompressedStreamTools;
 import net.minecraft.server.v1_16_R1.NBTTagCompound;
-import net.minecraft.server.v1_16_R1.NBTTagList;
 
-public class NBTCompoundImpl implements NBTCompound {
+import java.io.*;
+
+public abstract class NBTCompoundImpl implements NBTCompound {
 
     protected NBTTagCompound compound;
 
@@ -75,4 +77,33 @@ public class NBTCompoundImpl implements NBTCompound {
         return new NBTObjectImpl(compound, tag);
     }
 
+    @Override
+    public byte[] serialize(String... exclusions) {
+        try (ByteArrayOutputStream outputStream = new ByteArrayOutputStream();
+             ObjectOutputStream dataOutput = new ObjectOutputStream(outputStream)) {
+            addExtras();
+            NBTTagCompound compound = this.compound.clone();
+
+            for (String exclusion : exclusions)
+                compound.remove(exclusion);
+
+            NBTCompressedStreamTools.a(compound, (OutputStream) dataOutput);
+
+            return outputStream.toByteArray();
+        } catch (Exception e) {
+            e.printStackTrace();
+        }
+        return null;
+    }
+
+    @Override
+    public void deSerialize(byte[] serialized) {
+        try (ByteArrayInputStream inputStream = new ByteArrayInputStream(serialized);
+             ObjectInputStream dataInput = new ObjectInputStream(inputStream)) {
+            compound = NBTCompressedStreamTools.a((InputStream) dataInput);
+        } catch (Exception e) {
+            e.printStackTrace();
+        }
+    }
+
 }

NMS/NMS-v1_16_R1/src/com/songoda/core/nms/v1_16_R1/nbt/NBTCoreImpl.java

@@ -1,9 +1,12 @@
 package com.songoda.core.nms.v1_16_R1.nbt;
 
-import com.songoda.core.nms.nbt.NBTCompound;
 import com.songoda.core.nms.nbt.NBTCore;
+import com.songoda.core.nms.nbt.NBTEntity;
 import com.songoda.core.nms.nbt.NBTItem;
+import net.minecraft.server.v1_16_R1.NBTTagCompound;
+import org.bukkit.craftbukkit.v1_16_R1.entity.CraftEntity;
 import org.bukkit.craftbukkit.v1_16_R1.inventory.CraftItemStack;
+import org.bukkit.entity.Entity;
 import org.bukkit.inventory.ItemStack;
 
 public class NBTCoreImpl implements NBTCore {
@@ -14,8 +17,21 @@ public class NBTCoreImpl implements NBTCore {
     }
 
     @Override
-    public NBTCompound newCompound() {
+    public NBTItem newItem() {
-        return new NBTCompoundImpl();
+        return new NBTItemImpl(null);
+    }
+
+    @Override
+    public NBTEntity of(Entity entity) {
+        net.minecraft.server.v1_16_R1.Entity nmsEntity = ((CraftEntity) entity).getHandle();
+        NBTTagCompound nbt = new NBTTagCompound();
+        nmsEntity.save(nbt);
+        return new NBTEntityImpl(nbt, nmsEntity);
+    }
+
+    @Override
+    public NBTEntity newEntity() {
+        return new NBTEntityImpl(new NBTTagCompound(), null);
     }
 
 }

NMS/NMS-v1_16_R1/src/com/songoda/core/nms/v1_16_R1/nbt/NBTEntityImpl.java

@@ -0,0 +1,57 @@
+package com.songoda.core.nms.v1_16_R1.nbt;
+
+import com.songoda.core.nms.nbt.NBTEntity;
+import net.minecraft.server.v1_16_R1.*;
+import org.bukkit.Location;
+import org.bukkit.craftbukkit.v1_16_R1.CraftWorld;
+
+import java.util.Optional;
+
+public class NBTEntityImpl extends NBTCompoundImpl implements NBTEntity {
+
+    private Entity nmsEntity;
+
+    public NBTEntityImpl(NBTTagCompound entityNBT, Entity nmsEntity) {
+        super(entityNBT);
+        this.nmsEntity = nmsEntity;
+    }
+
+    @Override
+    public org.bukkit.entity.Entity spawn(Location location) {
+        String entityType = getNBTObject("entity_type").asString();
+
+        Optional<EntityTypes<?>> optionalEntity = EntityTypes.a(entityType);
+        if (optionalEntity.isPresent()) {
+            Entity spawned = optionalEntity.get().spawnCreature(
+                    ((CraftWorld) location.getWorld()).getHandle(),
+                    compound,
+                    null,
+                    null,
+                    new BlockPosition(location.getBlockX(), location.getBlockY(), location.getBlockZ()),
+                    EnumMobSpawn.COMMAND,
+                    true,
+                    false
+            );
+
+            if (spawned != null) {
+                spawned.load(compound);
+                org.bukkit.entity.Entity entity = spawned.getBukkitEntity();
+                entity.teleport(location);
+                nmsEntity = spawned;
+                return entity;
+            }
+        }
+        return null;
+    }
+
+    @Override
+    public org.bukkit.entity.Entity reSpawn(Location location) {
+        nmsEntity.dead = true;
+        return spawn(location);
+    }
+
+    @Override
+    public void addExtras() {
+        compound.setString("entity_type", IRegistry.ENTITY_TYPE.getKey(nmsEntity.getEntityType()).toString());
+    }
+}

NMS/NMS-v1_16_R1/src/com/songoda/core/nms/v1_16_R1/nbt/NBTItemImpl.java

@@ -2,6 +2,7 @@ package com.songoda.core.nms.v1_16_R1.nbt;
 
 import com.songoda.core.nms.nbt.NBTItem;
 import net.minecraft.server.v1_16_R1.NBTTagCompound;
+import org.bukkit.Material;
 import org.bukkit.craftbukkit.v1_16_R1.inventory.CraftItemStack;
 import org.bukkit.inventory.ItemStack;
 
@@ -10,11 +11,21 @@ public class NBTItemImpl extends NBTCompoundImpl implements NBTItem {
     private net.minecraft.server.v1_16_R1.ItemStack nmsItem;
 
     public NBTItemImpl(net.minecraft.server.v1_16_R1.ItemStack nmsItem) {
-        super(nmsItem.hasTag() ? nmsItem.getTag() : new NBTTagCompound());
+        super(nmsItem != null && nmsItem.hasTag() ? nmsItem.getTag() : new NBTTagCompound());
         this.nmsItem = nmsItem;
     }
 
     public ItemStack finish() {
-        return CraftItemStack.asBukkitCopy(nmsItem);
+        if (nmsItem == null) {
+            net.minecraft.server.v1_16_R1.ItemStack itemStack = CraftItemStack.asNMSCopy(new ItemStack(Material.STONE));
+            itemStack.setTag(compound);
+            return CraftItemStack.asBukkitCopy(nmsItem);
+        } else {
+            return CraftItemStack.asBukkitCopy(nmsItem);
+        }
+    }
+
+    @Override
+    public void addExtras() {
     }
 }

NMS/NMS-v1_16_R2/src/com/songoda/core/nms/v1_16_R2/nbt/NBTCompoundImpl.java

@@ -2,10 +2,12 @@ package com.songoda.core.nms.v1_16_R2.nbt;
 
 import com.songoda.core.nms.nbt.NBTCompound;
 import com.songoda.core.nms.nbt.NBTObject;
+import net.minecraft.server.v1_16_R2.NBTCompressedStreamTools;
 import net.minecraft.server.v1_16_R2.NBTTagCompound;
-import net.minecraft.server.v1_16_R2.NBTTagList;
 
-public class NBTCompoundImpl implements NBTCompound {
+import java.io.*;
+
+public abstract class NBTCompoundImpl implements NBTCompound {
 
     protected NBTTagCompound compound;
 
@@ -75,4 +77,33 @@ public class NBTCompoundImpl implements NBTCompound {
         return new NBTObjectImpl(compound, tag);
     }
 
+    @Override
+    public byte[] serialize(String... exclusions) {
+        try (ByteArrayOutputStream outputStream = new ByteArrayOutputStream();
+             ObjectOutputStream dataOutput = new ObjectOutputStream(outputStream)) {
+            addExtras();
+            NBTTagCompound compound = this.compound.clone();
+
+            for (String exclusion : exclusions)
+                compound.remove(exclusion);
+
+            NBTCompressedStreamTools.a(compound, (OutputStream) dataOutput);
+
+            return outputStream.toByteArray();
+        } catch (Exception e) {
+            e.printStackTrace();
+        }
+        return null;
+    }
+
+    @Override
+    public void deSerialize(byte[] serialized) {
+        try (ByteArrayInputStream inputStream = new ByteArrayInputStream(serialized);
+             ObjectInputStream dataInput = new ObjectInputStream(inputStream)) {
+            compound = NBTCompressedStreamTools.a((InputStream) dataInput);
+        } catch (Exception e) {
+            e.printStackTrace();
+        }
+    }
+
 }

NMS/NMS-v1_16_R2/src/com/songoda/core/nms/v1_16_R2/nbt/NBTCoreImpl.java

@@ -2,8 +2,12 @@ package com.songoda.core.nms.v1_16_R2.nbt;
 
 import com.songoda.core.nms.nbt.NBTCompound;
 import com.songoda.core.nms.nbt.NBTCore;
+import com.songoda.core.nms.nbt.NBTEntity;
 import com.songoda.core.nms.nbt.NBTItem;
+import net.minecraft.server.v1_16_R2.NBTTagCompound;
+import org.bukkit.craftbukkit.v1_16_R2.entity.CraftEntity;
 import org.bukkit.craftbukkit.v1_16_R2.inventory.CraftItemStack;
+import org.bukkit.entity.Entity;
 import org.bukkit.inventory.ItemStack;
 
 public class NBTCoreImpl implements NBTCore {
@@ -14,8 +18,21 @@ public class NBTCoreImpl implements NBTCore {
     }
 
     @Override
-    public NBTCompound newCompound() {
+    public NBTItem newItem() {
-        return new NBTCompoundImpl();
+        return new NBTItemImpl(null);
+    }
+
+    @Override
+    public NBTEntity of(Entity entity) {
+        net.minecraft.server.v1_16_R2.Entity nmsEntity = ((CraftEntity) entity).getHandle();
+        NBTTagCompound nbt = new NBTTagCompound();
+        nmsEntity.save(nbt);
+        return new NBTEntityImpl(nbt, nmsEntity);
+    }
+
+    @Override
+    public NBTEntity newEntity() {
+        return new NBTEntityImpl(new NBTTagCompound(), null);
     }
 
 }

NMS/NMS-v1_16_R2/src/com/songoda/core/nms/v1_16_R2/nbt/NBTEntityImpl.java

@@ -0,0 +1,57 @@
+package com.songoda.core.nms.v1_16_R2.nbt;
+
+import com.songoda.core.nms.nbt.NBTEntity;
+import net.minecraft.server.v1_16_R2.*;
+import org.bukkit.Location;
+import org.bukkit.craftbukkit.v1_16_R2.CraftWorld;
+
+import java.util.Optional;
+
+public class NBTEntityImpl extends NBTCompoundImpl implements NBTEntity {
+
+    private Entity nmsEntity;
+
+    public NBTEntityImpl(NBTTagCompound entityNBT, Entity nmsEntity) {
+        super(entityNBT);
+        this.nmsEntity = nmsEntity;
+    }
+
+    @Override
+    public org.bukkit.entity.Entity spawn(Location location) {
+        String entityType = getNBTObject("entity_type").asString();
+
+        Optional<EntityTypes<?>> optionalEntity = EntityTypes.a(entityType);
+        if (optionalEntity.isPresent()) {
+            Entity spawned = optionalEntity.get().spawnCreature(
+                    ((CraftWorld) location.getWorld()).getHandle(),
+                    compound,
+                    null,
+                    null,
+                    new BlockPosition(location.getBlockX(), location.getBlockY(), location.getBlockZ()),
+                    EnumMobSpawn.COMMAND,
+                    true,
+                    false
+            );
+
+            if (spawned != null) {
+                spawned.load(compound);
+                org.bukkit.entity.Entity entity = spawned.getBukkitEntity();
+                entity.teleport(location);
+                nmsEntity = spawned;
+                return entity;
+            }
+        }
+        return null;
+    }
+
+    @Override
+    public org.bukkit.entity.Entity reSpawn(Location location) {
+        nmsEntity.dead = true;
+        return spawn(location);
+    }
+
+    @Override
+    public void addExtras() {
+        compound.setString("entity_type", IRegistry.ENTITY_TYPE.getKey(nmsEntity.getEntityType()).toString());
+    }
+}

NMS/NMS-v1_16_R2/src/com/songoda/core/nms/v1_16_R2/nbt/NBTItemImpl.java

@@ -1,7 +1,9 @@
 package com.songoda.core.nms.v1_16_R2.nbt;
 
 import com.songoda.core.nms.nbt.NBTItem;
+import net.minecraft.server.v1_16_R2.IRegistry;
 import net.minecraft.server.v1_16_R2.NBTTagCompound;
+import org.bukkit.Material;
 import org.bukkit.craftbukkit.v1_16_R2.inventory.CraftItemStack;
 import org.bukkit.inventory.ItemStack;
 
@@ -10,11 +12,21 @@ public class NBTItemImpl extends NBTCompoundImpl implements NBTItem {
     private net.minecraft.server.v1_16_R2.ItemStack nmsItem;
 
     public NBTItemImpl(net.minecraft.server.v1_16_R2.ItemStack nmsItem) {
-        super(nmsItem.hasTag() ? nmsItem.getTag() : new NBTTagCompound());
+        super(nmsItem != null && nmsItem.hasTag() ? nmsItem.getTag() : new NBTTagCompound());
         this.nmsItem = nmsItem;
     }
 
     public ItemStack finish() {
-        return CraftItemStack.asBukkitCopy(nmsItem);
+        if (nmsItem == null) {
+            net.minecraft.server.v1_16_R2.ItemStack itemStack = CraftItemStack.asNMSCopy(new ItemStack(Material.STONE));
+            itemStack.setTag(compound);
+            return CraftItemStack.asBukkitCopy(nmsItem);
+        } else {
+            return CraftItemStack.asBukkitCopy(nmsItem);
+        }
+    }
+
+    @Override
+    public void addExtras() {
     }
 }

NMS/NMS-v1_8_R1/src/com/songoda/core/nms/v1_8_R1/nbt/NBTCompoundImpl.java

@@ -2,9 +2,12 @@ package com.songoda.core.nms.v1_8_R1.nbt;
 
 import com.songoda.core.nms.nbt.NBTCompound;
 import com.songoda.core.nms.nbt.NBTObject;
+import net.minecraft.server.v1_8_R1.NBTCompressedStreamTools;
 import net.minecraft.server.v1_8_R1.NBTTagCompound;
 
-public class NBTCompoundImpl implements NBTCompound {
+import java.io.*;
+
+public abstract class NBTCompoundImpl implements NBTCompound {
 
     protected NBTTagCompound compound;
 
@@ -74,4 +77,33 @@ public class NBTCompoundImpl implements NBTCompound {
         return new NBTObjectImpl(compound, tag);
     }
 
+    @Override
+    public byte[] serialize(String... exclusions) {
+        try (ByteArrayOutputStream outputStream = new ByteArrayOutputStream();
+             ObjectOutputStream dataOutput = new ObjectOutputStream(outputStream)) {
+            addExtras();
+            NBTTagCompound compound = (NBTTagCompound)this.compound.clone(); // Changed in 1.12 // Changed in 1.9.4
+
+            for (String exclusion : exclusions)
+                compound.remove(exclusion);
+
+            NBTCompressedStreamTools.a(compound, (OutputStream) dataOutput);
+
+            return outputStream.toByteArray();
+        } catch (Exception e) {
+            e.printStackTrace();
+        }
+        return null;
+    }
+
+    @Override
+    public void deSerialize(byte[] serialized) {
+        try (ByteArrayInputStream inputStream = new ByteArrayInputStream(serialized);
+             ObjectInputStream dataInput = new ObjectInputStream(inputStream)) {
+            compound = NBTCompressedStreamTools.a((InputStream) dataInput);
+        } catch (Exception e) {
+            e.printStackTrace();
+        }
+    }
+
 }

NMS/NMS-v1_8_R1/src/com/songoda/core/nms/v1_8_R1/nbt/NBTCoreImpl.java

@@ -1,9 +1,12 @@
 package com.songoda.core.nms.v1_8_R1.nbt;
 
-import com.songoda.core.nms.nbt.NBTCompound;
 import com.songoda.core.nms.nbt.NBTCore;
+import com.songoda.core.nms.nbt.NBTEntity;
 import com.songoda.core.nms.nbt.NBTItem;
+import net.minecraft.server.v1_8_R1.NBTTagCompound;
+import org.bukkit.craftbukkit.v1_8_R1.entity.CraftEntity;
 import org.bukkit.craftbukkit.v1_8_R1.inventory.CraftItemStack;
+import org.bukkit.entity.Entity;
 import org.bukkit.inventory.ItemStack;
 
 public class NBTCoreImpl implements NBTCore {
@@ -14,8 +17,21 @@ public class NBTCoreImpl implements NBTCore {
     }
 
     @Override
-    public NBTCompound newCompound() {
+    public NBTItem newItem() {
-        return new NBTCompoundImpl();
+        return new NBTItemImpl(null);
+    }
+
+    @Override
+    public NBTEntity of(Entity entity) {
+        net.minecraft.server.v1_8_R1.Entity nmsEntity = ((CraftEntity) entity).getHandle();
+        NBTTagCompound nbt = new NBTTagCompound();
+        nmsEntity.e(nbt); // Method name changed in 1.11
+        return new NBTEntityImpl(nbt, nmsEntity);
+    }
+
+    @Override
+    public NBTEntity newEntity() {
+        return new NBTEntityImpl(new NBTTagCompound(), null);
     }
 
 }

NMS/NMS-v1_8_R1/src/com/songoda/core/nms/v1_8_R1/nbt/NBTEntityImpl.java

@@ -0,0 +1,71 @@
+package com.songoda.core.nms.v1_8_R1.nbt;
+
+import com.songoda.core.nms.nbt.NBTEntity;
+import net.minecraft.server.v1_8_R1.*;
+import org.bukkit.Location;
+import org.bukkit.craftbukkit.v1_8_R1.CraftWorld;
+import org.bukkit.event.entity.CreatureSpawnEvent;
+
+import java.lang.reflect.Field;
+import java.util.Map;
+
+public class NBTEntityImpl extends NBTCompoundImpl implements NBTEntity {
+
+    private static Field fieldG;
+
+    private Entity nmsEntity;
+
+    public NBTEntityImpl(NBTTagCompound entityNBT, Entity nmsEntity) {
+        super(entityNBT);
+        this.nmsEntity = nmsEntity;
+    }
+
+    static {
+        try {
+            fieldG = EntityTypes.class.getDeclaredField("g");
+            fieldG.setAccessible(true);
+        } catch (NoSuchFieldException e) {
+            e.printStackTrace();
+        }
+
+    }
+
+    @Override
+    public org.bukkit.entity.Entity spawn(Location location) {
+        String entityType = getNBTObject("entity_type").asString();
+
+        try {
+            Entity spawned = ItemMonsterEgg.spawnCreature( // Changed since 1.14
+                    ((CraftWorld) location.getWorld()).getHandle(),
+                    ((Map<String, Integer>) fieldG.get(null)).get(entityType), // Parameter simplified in 1.10
+                    location.getBlockX(), location.getBlockY(), location.getBlockZ(),
+                    CreatureSpawnEvent.SpawnReason.DEFAULT
+            );
+
+            if (spawned != null) {
+                spawned.f(compound); // This changed from 1.16.1
+                org.bukkit.entity.Entity entity = spawned.getBukkitEntity();
+                spawned.setLocation(location.getX(), location.getY(), location.getZ(),
+                        location.getPitch(), location.getYaw());
+                nmsEntity = spawned;
+                return entity;
+            }
+        } catch (IllegalAccessException e) {
+            e.printStackTrace();
+        }
+        return null;
+    }
+
+    @Override
+    public org.bukkit.entity.Entity reSpawn(Location location) {
+        nmsEntity.dead = true;
+        return spawn(location);
+    }
+
+    @Override
+    public void addExtras() {
+        String key = EntityTypes.b(nmsEntity); // Changed in 1.12
+        if (key != null)
+            compound.setString("entity_type", key); // Changed in 1.13
+    }
+}

NMS/NMS-v1_8_R1/src/com/songoda/core/nms/v1_8_R1/nbt/NBTItemImpl.java

@@ -2,6 +2,7 @@ package com.songoda.core.nms.v1_8_R1.nbt;
 
 import com.songoda.core.nms.nbt.NBTItem;
 import net.minecraft.server.v1_8_R1.NBTTagCompound;
+import org.bukkit.Material;
 import org.bukkit.craftbukkit.v1_8_R1.inventory.CraftItemStack;
 import org.bukkit.inventory.ItemStack;
 
@@ -10,11 +11,21 @@ public class NBTItemImpl extends NBTCompoundImpl implements NBTItem {
     private net.minecraft.server.v1_8_R1.ItemStack nmsItem;
 
     public NBTItemImpl(net.minecraft.server.v1_8_R1.ItemStack nmsItem) {
-        super(nmsItem.hasTag() ? nmsItem.getTag() : new NBTTagCompound());
+        super(nmsItem != null && nmsItem.hasTag() ? nmsItem.getTag() : new NBTTagCompound());
         this.nmsItem = nmsItem;
     }
 
     public ItemStack finish() {
-        return CraftItemStack.asBukkitCopy(nmsItem);
+        if (nmsItem == null) {
+            net.minecraft.server.v1_8_R1.ItemStack itemStack = CraftItemStack.asNMSCopy(new ItemStack(Material.STONE));
+            itemStack.setTag(compound);
+            return CraftItemStack.asBukkitCopy(nmsItem);
+        } else {
+            return CraftItemStack.asBukkitCopy(nmsItem);
+        }
+    }
+
+    @Override
+    public void addExtras() {
     }
 }

NMS/NMS-v1_8_R2/src/com/songoda/core/nms/v1_8_R2/nbt/NBTCompoundImpl.java

@@ -2,9 +2,12 @@ package com.songoda.core.nms.v1_8_R2.nbt;
 
 import com.songoda.core.nms.nbt.NBTCompound;
 import com.songoda.core.nms.nbt.NBTObject;
+import net.minecraft.server.v1_8_R2.NBTCompressedStreamTools;
 import net.minecraft.server.v1_8_R2.NBTTagCompound;
 
-public class NBTCompoundImpl implements NBTCompound {
+import java.io.*;
+
+public abstract class NBTCompoundImpl implements NBTCompound {
 
     protected NBTTagCompound compound;
 
@@ -74,4 +77,33 @@ public class NBTCompoundImpl implements NBTCompound {
         return new NBTObjectImpl(compound, tag);
     }
 
+    @Override
+    public byte[] serialize(String... exclusions) {
+        try (ByteArrayOutputStream outputStream = new ByteArrayOutputStream();
+             ObjectOutputStream dataOutput = new ObjectOutputStream(outputStream)) {
+            addExtras();
+            NBTTagCompound compound = (NBTTagCompound)this.compound.clone(); // Changed in 1.12 // Changed in 1.9.4
+
+            for (String exclusion : exclusions)
+                compound.remove(exclusion);
+
+            NBTCompressedStreamTools.a(compound, (OutputStream) dataOutput);
+
+            return outputStream.toByteArray();
+        } catch (Exception e) {
+            e.printStackTrace();
+        }
+        return null;
+    }
+
+    @Override
+    public void deSerialize(byte[] serialized) {
+        try (ByteArrayInputStream inputStream = new ByteArrayInputStream(serialized);
+             ObjectInputStream dataInput = new ObjectInputStream(inputStream)) {
+            compound = NBTCompressedStreamTools.a((InputStream) dataInput);
+        } catch (Exception e) {
+            e.printStackTrace();
+        }
+    }
+
 }

NMS/NMS-v1_8_R2/src/com/songoda/core/nms/v1_8_R2/nbt/NBTCoreImpl.java

@@ -1,9 +1,12 @@
 package com.songoda.core.nms.v1_8_R2.nbt;
 
-import com.songoda.core.nms.nbt.NBTCompound;
 import com.songoda.core.nms.nbt.NBTCore;
+import com.songoda.core.nms.nbt.NBTEntity;
 import com.songoda.core.nms.nbt.NBTItem;
+import net.minecraft.server.v1_8_R2.NBTTagCompound;
+import org.bukkit.craftbukkit.v1_8_R2.entity.CraftEntity;
 import org.bukkit.craftbukkit.v1_8_R2.inventory.CraftItemStack;
+import org.bukkit.entity.Entity;
 import org.bukkit.inventory.ItemStack;
 
 public class NBTCoreImpl implements NBTCore {
@@ -14,8 +17,21 @@ public class NBTCoreImpl implements NBTCore {
     }
 
     @Override
-    public NBTCompound newCompound() {
+    public NBTItem newItem() {
-        return new NBTCompoundImpl();
+        return new NBTItemImpl(null);
+    }
+
+    @Override
+    public NBTEntity of(Entity entity) {
+        net.minecraft.server.v1_8_R2.Entity nmsEntity = ((CraftEntity) entity).getHandle();
+        NBTTagCompound nbt = new NBTTagCompound();
+        nmsEntity.e(nbt); // Method name changed in 1.11
+        return new NBTEntityImpl(nbt, nmsEntity);
+    }
+
+    @Override
+    public NBTEntity newEntity() {
+        return new NBTEntityImpl(new NBTTagCompound(), null);
     }
 
 }

NMS/NMS-v1_8_R2/src/com/songoda/core/nms/v1_8_R2/nbt/NBTEntityImpl.java

@@ -0,0 +1,71 @@
+package com.songoda.core.nms.v1_8_R2.nbt;
+
+import com.songoda.core.nms.nbt.NBTEntity;
+import net.minecraft.server.v1_8_R2.*;
+import org.bukkit.Location;
+import org.bukkit.craftbukkit.v1_8_R2.CraftWorld;
+import org.bukkit.event.entity.CreatureSpawnEvent;
+
+import java.lang.reflect.Field;
+import java.util.Map;
+
+public class NBTEntityImpl extends NBTCompoundImpl implements NBTEntity {
+
+    private static Field fieldG;
+
+    private Entity nmsEntity;
+
+    public NBTEntityImpl(NBTTagCompound entityNBT, Entity nmsEntity) {
+        super(entityNBT);
+        this.nmsEntity = nmsEntity;
+    }
+
+    static {
+        try {
+            fieldG = EntityTypes.class.getDeclaredField("g");
+            fieldG.setAccessible(true);
+        } catch (NoSuchFieldException e) {
+            e.printStackTrace();
+        }
+
+    }
+
+    @Override
+    public org.bukkit.entity.Entity spawn(Location location) {
+        String entityType = getNBTObject("entity_type").asString();
+
+        try {
+            Entity spawned = ItemMonsterEgg.spawnCreature( // Changed since 1.14
+                    ((CraftWorld) location.getWorld()).getHandle(),
+                    ((Map<String, Integer>) fieldG.get(null)).get(entityType), // Parameter simplified in 1.10
+                    location.getBlockX(), location.getBlockY(), location.getBlockZ(),
+                    CreatureSpawnEvent.SpawnReason.DEFAULT
+            );
+
+            if (spawned != null) {
+                spawned.f(compound); // This changed from 1.16.1
+                org.bukkit.entity.Entity entity = spawned.getBukkitEntity();
+                spawned.setLocation(location.getX(), location.getY(), location.getZ(),
+                        location.getPitch(), location.getYaw());
+                nmsEntity = spawned;
+                return entity;
+            }
+        } catch (IllegalAccessException e) {
+            e.printStackTrace();
+        }
+        return null;
+    }
+
+    @Override
+    public org.bukkit.entity.Entity reSpawn(Location location) {
+        nmsEntity.dead = true;
+        return spawn(location);
+    }
+
+    @Override
+    public void addExtras() {
+        String key = EntityTypes.b(nmsEntity); // Changed in 1.12
+        if (key != null)
+            compound.setString("entity_type", key); // Changed in 1.13
+    }
+}

NMS/NMS-v1_8_R2/src/com/songoda/core/nms/v1_8_R2/nbt/NBTItemImpl.java

@@ -2,6 +2,7 @@ package com.songoda.core.nms.v1_8_R2.nbt;
 
 import com.songoda.core.nms.nbt.NBTItem;
 import net.minecraft.server.v1_8_R2.NBTTagCompound;
+import org.bukkit.Material;
 import org.bukkit.craftbukkit.v1_8_R2.inventory.CraftItemStack;
 import org.bukkit.inventory.ItemStack;
 
@@ -10,11 +11,21 @@ public class NBTItemImpl extends NBTCompoundImpl implements NBTItem {
     private net.minecraft.server.v1_8_R2.ItemStack nmsItem;
 
     public NBTItemImpl(net.minecraft.server.v1_8_R2.ItemStack nmsItem) {
-        super(nmsItem.hasTag() ? nmsItem.getTag() : new NBTTagCompound());
+        super(nmsItem != null && nmsItem.hasTag() ? nmsItem.getTag() : new NBTTagCompound());
         this.nmsItem = nmsItem;
     }
 
     public ItemStack finish() {
-        return CraftItemStack.asBukkitCopy(nmsItem);
+        if (nmsItem == null) {
+            net.minecraft.server.v1_8_R2.ItemStack itemStack = CraftItemStack.asNMSCopy(new ItemStack(Material.STONE));
+            itemStack.setTag(compound);
+            return CraftItemStack.asBukkitCopy(nmsItem);
+        } else {
+            return CraftItemStack.asBukkitCopy(nmsItem);
+        }
+    }
+
+    @Override
+    public void addExtras() {
     }
 }

NMS/NMS-v1_8_R3/src/com/songoda/core/nms/v1_8_R3/nbt/NBTCompoundImpl.java

@@ -2,9 +2,12 @@ package com.songoda.core.nms.v1_8_R3.nbt;
 
 import com.songoda.core.nms.nbt.NBTCompound;
 import com.songoda.core.nms.nbt.NBTObject;
+import net.minecraft.server.v1_8_R3.NBTCompressedStreamTools;
 import net.minecraft.server.v1_8_R3.NBTTagCompound;
 
-public class NBTCompoundImpl implements NBTCompound {
+import java.io.*;
+
+public abstract class NBTCompoundImpl implements NBTCompound {
 
     protected NBTTagCompound compound;
 
@@ -74,4 +77,33 @@ public class NBTCompoundImpl implements NBTCompound {
         return new NBTObjectImpl(compound, tag);
     }
 
+    @Override
+    public byte[] serialize(String... exclusions) {
+        try (ByteArrayOutputStream outputStream = new ByteArrayOutputStream();
+             ObjectOutputStream dataOutput = new ObjectOutputStream(outputStream)) {
+            addExtras();
+            NBTTagCompound compound = (NBTTagCompound)this.compound.clone(); // Changed in 1.12 // Changed in 1.9.4
+
+            for (String exclusion : exclusions)
+                compound.remove(exclusion);
+
+            NBTCompressedStreamTools.a(compound, (OutputStream) dataOutput);
+
+            return outputStream.toByteArray();
+        } catch (Exception e) {
+            e.printStackTrace();
+        }
+        return null;
+    }
+
+    @Override
+    public void deSerialize(byte[] serialized) {
+        try (ByteArrayInputStream inputStream = new ByteArrayInputStream(serialized);
+             ObjectInputStream dataInput = new ObjectInputStream(inputStream)) {
+            compound = NBTCompressedStreamTools.a((InputStream) dataInput);
+        } catch (Exception e) {
+            e.printStackTrace();
+        }
+    }
+
 }

NMS/NMS-v1_8_R3/src/com/songoda/core/nms/v1_8_R3/nbt/NBTCoreImpl.java

@@ -1,9 +1,12 @@
 package com.songoda.core.nms.v1_8_R3.nbt;
 
-import com.songoda.core.nms.nbt.NBTCompound;
 import com.songoda.core.nms.nbt.NBTCore;
+import com.songoda.core.nms.nbt.NBTEntity;
 import com.songoda.core.nms.nbt.NBTItem;
+import net.minecraft.server.v1_8_R3.NBTTagCompound;
+import org.bukkit.craftbukkit.v1_8_R3.entity.CraftEntity;
 import org.bukkit.craftbukkit.v1_8_R3.inventory.CraftItemStack;
+import org.bukkit.entity.Entity;
 import org.bukkit.inventory.ItemStack;
 
 public class NBTCoreImpl implements NBTCore {
@@ -14,8 +17,21 @@ public class NBTCoreImpl implements NBTCore {
     }
 
     @Override
-    public NBTCompound newCompound() {
+    public NBTItem newItem() {
-        return new NBTCompoundImpl();
+        return new NBTItemImpl(null);
+    }
+
+    @Override
+    public NBTEntity of(Entity entity) {
+        net.minecraft.server.v1_8_R3.Entity nmsEntity = ((CraftEntity) entity).getHandle();
+        NBTTagCompound nbt = new NBTTagCompound();
+        nmsEntity.e(nbt); // Method name changed in 1.11
+        return new NBTEntityImpl(nbt, nmsEntity);
+    }
+
+    @Override
+    public NBTEntity newEntity() {
+        return new NBTEntityImpl(new NBTTagCompound(), null);
     }
 
 }

NMS/NMS-v1_8_R3/src/com/songoda/core/nms/v1_8_R3/nbt/NBTEntityImpl.java

@@ -0,0 +1,71 @@
+package com.songoda.core.nms.v1_8_R3.nbt;
+
+import com.songoda.core.nms.nbt.NBTEntity;
+import net.minecraft.server.v1_8_R3.*;
+import org.bukkit.Location;
+import org.bukkit.craftbukkit.v1_8_R3.CraftWorld;
+import org.bukkit.event.entity.CreatureSpawnEvent;
+
+import java.lang.reflect.Field;
+import java.util.Map;
+
+public class NBTEntityImpl extends NBTCompoundImpl implements NBTEntity {
+
+    private static Field fieldG;
+
+    private Entity nmsEntity;
+
+    public NBTEntityImpl(NBTTagCompound entityNBT, Entity nmsEntity) {
+        super(entityNBT);
+        this.nmsEntity = nmsEntity;
+    }
+
+    static {
+        try {
+            fieldG = EntityTypes.class.getDeclaredField("g");
+            fieldG.setAccessible(true);
+        } catch (NoSuchFieldException e) {
+            e.printStackTrace();
+        }
+
+    }
+
+    @Override
+    public org.bukkit.entity.Entity spawn(Location location) {
+        String entityType = getNBTObject("entity_type").asString();
+
+        try {
+            Entity spawned = ItemMonsterEgg.spawnCreature( // Changed since 1.14
+                    ((CraftWorld) location.getWorld()).getHandle(),
+                    ((Map<String, Integer>) fieldG.get(null)).get(entityType), // Parameter simplified in 1.10
+                    location.getBlockX(), location.getBlockY(), location.getBlockZ(),
+                    CreatureSpawnEvent.SpawnReason.DEFAULT
+            );
+
+            if (spawned != null) {
+                spawned.f(compound); // This changed from 1.16.1
+                org.bukkit.entity.Entity entity = spawned.getBukkitEntity();
+                spawned.setLocation(location.getX(), location.getY(), location.getZ(),
+                        location.getPitch(), location.getYaw());
+                nmsEntity = spawned;
+                return entity;
+            }
+        } catch (IllegalAccessException e) {
+            e.printStackTrace();
+        }
+        return null;
+    }
+
+    @Override
+    public org.bukkit.entity.Entity reSpawn(Location location) {
+        nmsEntity.dead = true;
+        return spawn(location);
+    }
+
+    @Override
+    public void addExtras() {
+        String key = EntityTypes.b(nmsEntity); // Changed in 1.12
+        if (key != null)
+            compound.setString("entity_type", key); // Changed in 1.13
+    }
+}

NMS/NMS-v1_8_R3/src/com/songoda/core/nms/v1_8_R3/nbt/NBTItemImpl.java

@@ -2,6 +2,7 @@ package com.songoda.core.nms.v1_8_R3.nbt;
 
 import com.songoda.core.nms.nbt.NBTItem;
 import net.minecraft.server.v1_8_R3.NBTTagCompound;
+import org.bukkit.Material;
 import org.bukkit.craftbukkit.v1_8_R3.inventory.CraftItemStack;
 import org.bukkit.inventory.ItemStack;
 
@@ -10,11 +11,21 @@ public class NBTItemImpl extends NBTCompoundImpl implements NBTItem {
     private net.minecraft.server.v1_8_R3.ItemStack nmsItem;
 
     public NBTItemImpl(net.minecraft.server.v1_8_R3.ItemStack nmsItem) {
-        super(nmsItem.hasTag() ? nmsItem.getTag() : new NBTTagCompound());
+        super(nmsItem != null && nmsItem.hasTag() ? nmsItem.getTag() : new NBTTagCompound());
         this.nmsItem = nmsItem;
     }
 
     public ItemStack finish() {
-        return CraftItemStack.asBukkitCopy(nmsItem);
+        if (nmsItem == null) {
+            net.minecraft.server.v1_8_R3.ItemStack itemStack = CraftItemStack.asNMSCopy(new ItemStack(Material.STONE));
+            itemStack.setTag(compound);
+            return CraftItemStack.asBukkitCopy(nmsItem);
+        } else {
+            return CraftItemStack.asBukkitCopy(nmsItem);
+        }
+    }
+
+    @Override
+    public void addExtras() {
     }
 }

NMS/NMS-v1_9_R1/src/com/songoda/core/nms/v1_9_R1/nbt/NBTCompoundImpl.java

@@ -2,9 +2,12 @@ package com.songoda.core.nms.v1_9_R1.nbt;
 
 import com.songoda.core.nms.nbt.NBTCompound;
 import com.songoda.core.nms.nbt.NBTObject;
+import net.minecraft.server.v1_9_R1.NBTCompressedStreamTools;
 import net.minecraft.server.v1_9_R1.NBTTagCompound;
 
-public class NBTCompoundImpl implements NBTCompound {
+import java.io.*;
+
+public abstract class NBTCompoundImpl implements NBTCompound {
 
     protected NBTTagCompound compound;
 
@@ -74,4 +77,33 @@ public class NBTCompoundImpl implements NBTCompound {
         return new NBTObjectImpl(compound, tag);
     }
 
+    @Override
+    public byte[] serialize(String... exclusions) {
+        try (ByteArrayOutputStream outputStream = new ByteArrayOutputStream();
+             ObjectOutputStream dataOutput = new ObjectOutputStream(outputStream)) {
+            addExtras();
+            NBTTagCompound compound = (NBTTagCompound)this.compound.clone(); // Changed in 1.12 // Changed in 1.9.4
+
+            for (String exclusion : exclusions)
+                compound.remove(exclusion);
+
+            NBTCompressedStreamTools.a(compound, (OutputStream) dataOutput);
+
+            return outputStream.toByteArray();
+        } catch (Exception e) {
+            e.printStackTrace();
+        }
+        return null;
+    }
+
+    @Override
+    public void deSerialize(byte[] serialized) {
+        try (ByteArrayInputStream inputStream = new ByteArrayInputStream(serialized);
+             ObjectInputStream dataInput = new ObjectInputStream(inputStream)) {
+            compound = NBTCompressedStreamTools.a((InputStream) dataInput);
+        } catch (Exception e) {
+            e.printStackTrace();
+        }
+    }
+
 }

NMS/NMS-v1_9_R1/src/com/songoda/core/nms/v1_9_R1/nbt/NBTCoreImpl.java

@@ -1,9 +1,12 @@
 package com.songoda.core.nms.v1_9_R1.nbt;
 
-import com.songoda.core.nms.nbt.NBTCompound;
 import com.songoda.core.nms.nbt.NBTCore;
+import com.songoda.core.nms.nbt.NBTEntity;
 import com.songoda.core.nms.nbt.NBTItem;
+import net.minecraft.server.v1_9_R1.NBTTagCompound;
+import org.bukkit.craftbukkit.v1_9_R1.entity.CraftEntity;
 import org.bukkit.craftbukkit.v1_9_R1.inventory.CraftItemStack;
+import org.bukkit.entity.Entity;
 import org.bukkit.inventory.ItemStack;
 
 public class NBTCoreImpl implements NBTCore {
@@ -14,8 +17,21 @@ public class NBTCoreImpl implements NBTCore {
     }
 
     @Override
-    public NBTCompound newCompound() {
+    public NBTItem newItem() {
-        return new NBTCompoundImpl();
+        return new NBTItemImpl(null);
+    }
+
+    @Override
+    public NBTEntity of(Entity entity) {
+        net.minecraft.server.v1_9_R1.Entity nmsEntity = ((CraftEntity) entity).getHandle();
+        NBTTagCompound nbt = new NBTTagCompound();
+        nmsEntity.e(nbt); // Method name changed in 1.11
+        return new NBTEntityImpl(nbt, nmsEntity);
+    }
+
+    @Override
+    public NBTEntity newEntity() {
+        return new NBTEntityImpl(new NBTTagCompound(), null);
     }
 
 }

NMS/NMS-v1_9_R1/src/com/songoda/core/nms/v1_9_R1/nbt/NBTEntityImpl.java

@@ -0,0 +1,52 @@
+package com.songoda.core.nms.v1_9_R1.nbt;
+
+import com.songoda.core.nms.nbt.NBTEntity;
+import net.minecraft.server.v1_9_R1.*;
+import org.bukkit.Location;
+import org.bukkit.craftbukkit.v1_9_R1.CraftWorld;
+import org.bukkit.event.entity.CreatureSpawnEvent;
+
+public class NBTEntityImpl extends NBTCompoundImpl implements NBTEntity {
+
+    private Entity nmsEntity;
+
+    public NBTEntityImpl(NBTTagCompound entityNBT, Entity nmsEntity) {
+        super(entityNBT);
+        this.nmsEntity = nmsEntity;
+    }
+
+    @Override
+    public org.bukkit.entity.Entity spawn(Location location) {
+        String entityType = getNBTObject("entity_type").asString();
+
+            Entity spawned = ItemMonsterEgg.spawnCreature( // Changed since 1.14
+                    ((CraftWorld) location.getWorld()).getHandle(),
+                    entityType, // Parameter simplified in 1.10
+                    location.getBlockX(), location.getBlockY(), location.getBlockZ(),
+                    CreatureSpawnEvent.SpawnReason.DEFAULT
+            );
+
+            if (spawned != null) {
+                spawned.f(compound); // This changed from 1.16.1
+                org.bukkit.entity.Entity entity = spawned.getBukkitEntity();
+                spawned.setLocation(location.getX(), location.getY(), location.getZ(),
+                        location.getPitch(), location.getYaw());
+                nmsEntity = spawned;
+                return entity;
+            }
+        return null;
+    }
+
+    @Override
+    public org.bukkit.entity.Entity reSpawn(Location location) {
+        nmsEntity.dead = true;
+        return spawn(location);
+    }
+
+    @Override
+    public void addExtras() {
+        String key = EntityTypes.b(nmsEntity); // Changed in 1.12
+        if (key != null)
+            compound.setString("entity_type", key); // Changed in 1.13
+    }
+}

NMS/NMS-v1_9_R1/src/com/songoda/core/nms/v1_9_R1/nbt/NBTItemImpl.java

@@ -2,6 +2,7 @@ package com.songoda.core.nms.v1_9_R1.nbt;
 
 import com.songoda.core.nms.nbt.NBTItem;
 import net.minecraft.server.v1_9_R1.NBTTagCompound;
+import org.bukkit.Material;
 import org.bukkit.craftbukkit.v1_9_R1.inventory.CraftItemStack;
 import org.bukkit.inventory.ItemStack;
 
@@ -10,11 +11,21 @@ public class NBTItemImpl extends NBTCompoundImpl implements NBTItem {
     private net.minecraft.server.v1_9_R1.ItemStack nmsItem;
 
     public NBTItemImpl(net.minecraft.server.v1_9_R1.ItemStack nmsItem) {
-        super(nmsItem.hasTag() ? nmsItem.getTag() : new NBTTagCompound());
+        super(nmsItem != null && nmsItem.hasTag() ? nmsItem.getTag() : new NBTTagCompound());
         this.nmsItem = nmsItem;
     }
 
     public ItemStack finish() {
-        return CraftItemStack.asBukkitCopy(nmsItem);
+        if (nmsItem == null) {
+            net.minecraft.server.v1_9_R1.ItemStack itemStack = CraftItemStack.asNMSCopy(new ItemStack(Material.STONE));
+            itemStack.setTag(compound);
+            return CraftItemStack.asBukkitCopy(nmsItem);
+        } else {
+            return CraftItemStack.asBukkitCopy(nmsItem);
+        }
+    }
+
+    @Override
+    public void addExtras() {
     }
 }

NMS/NMS-v1_9_R2/src/com/songoda/core/nms/v1_9_R2/nbt/NBTCompoundImpl.java

@@ -2,9 +2,12 @@ package com.songoda.core.nms.v1_9_R2.nbt;
 
 import com.songoda.core.nms.nbt.NBTCompound;
 import com.songoda.core.nms.nbt.NBTObject;
+import net.minecraft.server.v1_9_R2.NBTCompressedStreamTools;
 import net.minecraft.server.v1_9_R2.NBTTagCompound;
 
-public class NBTCompoundImpl implements NBTCompound {
+import java.io.*;
+
+public abstract class NBTCompoundImpl implements NBTCompound {
 
     protected NBTTagCompound compound;
 
@@ -74,4 +77,33 @@ public class NBTCompoundImpl implements NBTCompound {
         return new NBTObjectImpl(compound, tag);
     }
 
+    @Override
+    public byte[] serialize(String... exclusions) {
+        try (ByteArrayOutputStream outputStream = new ByteArrayOutputStream();
+             ObjectOutputStream dataOutput = new ObjectOutputStream(outputStream)) {
+            addExtras();
+            NBTTagCompound compound = (NBTTagCompound)this.compound.clone(); // Changed in 1.12 // Changed in 1.9.4
+
+            for (String exclusion : exclusions)
+                compound.remove(exclusion);
+
+            NBTCompressedStreamTools.a(compound, (OutputStream) dataOutput);
+
+            return outputStream.toByteArray();
+        } catch (Exception e) {
+            e.printStackTrace();
+        }
+        return null;
+    }
+
+    @Override
+    public void deSerialize(byte[] serialized) {
+        try (ByteArrayInputStream inputStream = new ByteArrayInputStream(serialized);
+             ObjectInputStream dataInput = new ObjectInputStream(inputStream)) {
+            compound = NBTCompressedStreamTools.a((InputStream) dataInput);
+        } catch (Exception e) {
+            e.printStackTrace();
+        }
+    }
+
 }

NMS/NMS-v1_9_R2/src/com/songoda/core/nms/v1_9_R2/nbt/NBTCoreImpl.java

@@ -1,9 +1,12 @@
 package com.songoda.core.nms.v1_9_R2.nbt;
 
-import com.songoda.core.nms.nbt.NBTCompound;
 import com.songoda.core.nms.nbt.NBTCore;
+import com.songoda.core.nms.nbt.NBTEntity;
 import com.songoda.core.nms.nbt.NBTItem;
+import net.minecraft.server.v1_9_R2.NBTTagCompound;
+import org.bukkit.craftbukkit.v1_9_R2.entity.CraftEntity;
 import org.bukkit.craftbukkit.v1_9_R2.inventory.CraftItemStack;
+import org.bukkit.entity.Entity;
 import org.bukkit.inventory.ItemStack;
 
 public class NBTCoreImpl implements NBTCore {
@@ -14,8 +17,21 @@ public class NBTCoreImpl implements NBTCore {
     }
 
     @Override
-    public NBTCompound newCompound() {
+    public NBTItem newItem() {
-        return new NBTCompoundImpl();
+        return new NBTItemImpl(null);
+    }
+
+    @Override
+    public NBTEntity of(Entity entity) {
+        net.minecraft.server.v1_9_R2.Entity nmsEntity = ((CraftEntity) entity).getHandle();
+        NBTTagCompound nbt = new NBTTagCompound();
+        nmsEntity.e(nbt); // Method name changed in 1.11
+        return new NBTEntityImpl(nbt, nmsEntity);
+    }
+
+    @Override
+    public NBTEntity newEntity() {
+        return new NBTEntityImpl(new NBTTagCompound(), null);
     }
 
 }

NMS/NMS-v1_9_R2/src/com/songoda/core/nms/v1_9_R2/nbt/NBTEntityImpl.java

@@ -0,0 +1,52 @@
+package com.songoda.core.nms.v1_9_R2.nbt;
+
+import com.songoda.core.nms.nbt.NBTEntity;
+import net.minecraft.server.v1_9_R2.*;
+import org.bukkit.Location;
+import org.bukkit.craftbukkit.v1_9_R2.CraftWorld;
+import org.bukkit.event.entity.CreatureSpawnEvent;
+
+public class NBTEntityImpl extends NBTCompoundImpl implements NBTEntity {
+
+    private Entity nmsEntity;
+
+    public NBTEntityImpl(NBTTagCompound entityNBT, Entity nmsEntity) {
+        super(entityNBT);
+        this.nmsEntity = nmsEntity;
+    }
+
+    @Override
+    public org.bukkit.entity.Entity spawn(Location location) {
+        String entityType = getNBTObject("entity_type").asString();
+
+            Entity spawned = ItemMonsterEgg.spawnCreature( // Changed since 1.14
+                    ((CraftWorld) location.getWorld()).getHandle(),
+                    entityType, // Parameter simplified in 1.10
+                    location.getBlockX(), location.getBlockY(), location.getBlockZ(),
+                    CreatureSpawnEvent.SpawnReason.DEFAULT
+            );
+
+            if (spawned != null) {
+                spawned.f(compound); // This changed from 1.16.1
+                org.bukkit.entity.Entity entity = spawned.getBukkitEntity();
+                spawned.setLocation(location.getX(), location.getY(), location.getZ(),
+                        location.getPitch(), location.getYaw());
+                nmsEntity = spawned;
+                return entity;
+            }
+        return null;
+    }
+
+    @Override
+    public org.bukkit.entity.Entity reSpawn(Location location) {
+        nmsEntity.dead = true;
+        return spawn(location);
+    }
+
+    @Override
+    public void addExtras() {
+        String key = EntityTypes.b(nmsEntity); // Changed in 1.12
+        if (key != null)
+            compound.setString("entity_type", key); // Changed in 1.13
+    }
+}

NMS/NMS-v1_9_R2/src/com/songoda/core/nms/v1_9_R2/nbt/NBTItemImpl.java

@@ -2,6 +2,7 @@ package com.songoda.core.nms.v1_9_R2.nbt;
 
 import com.songoda.core.nms.nbt.NBTItem;
 import net.minecraft.server.v1_9_R2.NBTTagCompound;
+import org.bukkit.Material;
 import org.bukkit.craftbukkit.v1_9_R2.inventory.CraftItemStack;
 import org.bukkit.inventory.ItemStack;
 
@@ -10,11 +11,21 @@ public class NBTItemImpl extends NBTCompoundImpl implements NBTItem {
     private net.minecraft.server.v1_9_R2.ItemStack nmsItem;
 
     public NBTItemImpl(net.minecraft.server.v1_9_R2.ItemStack nmsItem) {
-        super(nmsItem.hasTag() ? nmsItem.getTag() : new NBTTagCompound());
+        super(nmsItem != null && nmsItem.hasTag() ? nmsItem.getTag() : new NBTTagCompound());
         this.nmsItem = nmsItem;
     }
 
     public ItemStack finish() {
-        return CraftItemStack.asBukkitCopy(nmsItem);
+        if (nmsItem == null) {
+            net.minecraft.server.v1_9_R2.ItemStack itemStack = CraftItemStack.asNMSCopy(new ItemStack(Material.STONE));
+            itemStack.setTag(compound);
+            return CraftItemStack.asBukkitCopy(nmsItem);
+        } else {
+            return CraftItemStack.asBukkitCopy(nmsItem);
+        }
+    }
+
+    @Override
+    public void addExtras() {
     }
 }