News_register_factoryDAO factory = (News_register_factoryDAO) Naming.lookup("demo");找不到 News_register_factory_stub

import java.net.MalformedURLException;
import java.rmi.Naming;
import java.rmi.NotBoundException;
import java.rmi.RemoteException;

import NewsDAO.News_register_factoryDAO;

public class NLookUp {
    public boolean lookup(String item) {
        String url = "//localhost:8807/factory";
        try {
            News_register_factoryDAO factory = (News_register_factoryDAO) Naming
                    .lookup("demo");
            if (item == "news") {
                factory.setItem("news");

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