Java sockets - Custom Objects Sending

Question

I have created working sockets, and when I try to send text or numbers, its ok, but when im trying to send my custom class object, i got NullPointerException... Here is some cod

Answer 1

You need to Serialize your Custom class before sending it through socket.The object that you are sending in

out.writeObject(list);

should be serialized, your class should implement java.io.Serializable interface