java-tutorials/java-rmi/src/main/java/com/baeldung/rmi/MessengerService.java

package com.baeldung.rmi;

import java.rmi.Remote;
import java.rmi.RemoteException;

public interface MessengerService extends Remote {

	public String sendMessage(String clientMessage) throws RemoteException;

	public Message sendMessage(Message clientMessage) throws RemoteException;
}