readobject method throws ClassNotFoundException

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The package name and classname must be exactly the same at the both sides. I.e. write once, compile once and then give the both sides the same copy. Don’t have separate server.Message and client.Message classes, but a single shared.Message class or something like that.

If you can guarantee the same package/class name, but not always whenever it’s exactly the same copy, then you need to add a serialVersionUID field with the same value to the class(es) in question.

package shared;

import java.io.Serializable;

public class Message implements Serializable {
    private static final long serialVersionUID = 1L;

    // ...
}

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