Get corresponding entity in server side

[zerozhou]

I'm making a mod that the player can choose the entity(living entity) near him with a GUI and bind to the player. But it seems that it's hard to get the corresponding entity in the server side. The entity id seems to work at first but after a thought and some code reading that it should be different between client and server(am i right?). So the problem is that I want to choose an entity with GUI and tell the server which one I've chosen. It's there any idea about it?

[Draco18s]

but after a thought and some code reading that it should be different between client and server(am i right?)

 

The IDs are different...until the client receives an entity update packet.  Then they're the same.

[zerozhou]

So what's the frequency of the entity update packet. I tried to find the class you mentioned but failed. Maybe I can consider that I can use the entity ID to identify the entity(Just with a few seconds latency, which I think it's acceptable)?

[Draco18s]

The entity ID never changes.  The only time the client will have a different entity ID for an entity is when it is just created.