Kryonet Connection ID Safety

Context: (SERVER-SIDE) Server uses Listener.class to process Client requests via:

public void received (Connection connection, Object object);

Question: with the following function call (from com.esotericsoftware.kryonet.Connection.class):

connection.getID();

…is integer variable ‘id’ uneditable by respective Connection, and can thereby be used by Server as a secure identifier for any given Connection under any and all circumstances?