import java.io.ByteArrayOutputStream;
import java.io.ObjectOutputStream;
import java.io.Serializable;
 
public class Main {
 
    static class BusinessObject implements Serializable{
 
        Object lock = new Object();
 
        public void buisinessMethod(){
            synchronized (lock){
                //...
            }
        }
 
        private void writeObject(java.io.ObjectOutputStream out) throws java.io.IOException {
        }
 
    }
 
    public static void main(String[] args) throws Exception{
        new ObjectOutputStream(new ByteArrayOutputStream()).writeObject(new BusinessObject());
    }
}

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