Hi all! I have creature entity. When player interacts with it then it gets and holds player entity.

        @Override
public boolean interact(EntityPlayer playerEnt) {
	this.playerEnt = playerEnt;
        }

When entity writes nbt it saves player UUID to nbt.

        @Override
public void writeEntityToNBT(NBTTagCompound var1) {
	super.writeEntityToNBT(var1);
                
                var1.setString("playerId", playerEnt.getGameProfile().getId().toString());
        }

And when it reading nbt, it also reads a player UUID and tries to get player entity from UUID

@Override
public void readEntityFromNBT(NBTTagCompound var1) {
	super.readEntityFromNBT(var1);

                playerEnt = this.worldObj.func_152378_a(UUID.fromString(var1.getString("playerId")));
        }

 

My problem is that after save and load 'playerEnt' always is null 

Where I made a mistake?

Thanks for that, but maybe I can get a small example, how to do what  If I not disturbing you.

And just so you know what exactly is a WeakReference, here is the Java Documentation for it:

 

http://docs.oracle.com/javase/7/docs/api/java/lang/ref/WeakReference.html and an article about it https://weblogs.java.net/blog/2006/05/04/understanding-weak-references

 

TL;DR: Garbage Collector Friendly Object

Thanks alot  finally I solved it