HelloServer.java

// HelloServer.java
import java.rmi.RemoteException;
import java.rmi.registry.LocateRegistry;
import java.rmi.registry.Registry;
import java.rmi.server.UnicastRemoteObject;
import java.util.ArrayList;
import java.util.List;

public class HelloServer implements HelloInterface {
    
    // Store messages received from clients
    private List<String> messages = new ArrayList<>();
    
    // Implement the remote methods
    public String sayHello(String name) throws RemoteException {
        return "Hello, " + name + "!";
    }
    
    public int add(int a, int b) throws RemoteException {
        return a + b;
    }
    
    // Client sends a message to server
    public void sendMessage(String message) throws RemoteException {
        messages.add(message);
        System.out.println("Received from client: " + message);
    }
    
    // Get all messages stored on server
    public List<String> getAllMessages() throws RemoteException {
        return new ArrayList<>(messages);
    }
    
    public static void main(String[] args) {
        try {
            // Create an instance of the server
            HelloServer server = new HelloServer();
            
            // Export the remote object
            HelloInterface stub = (HelloInterface) UnicastRemoteObject.exportObject(server, 0);
            
            // Create or get the RMI registry on port 1099
            Registry registry = LocateRegistry.createRegistry(1099);
            
            // Bind the remote object to the registry
            registry.rebind("HelloService", stub);
            
            System.out.println("Server is ready and running on port 1099...");
            
        } catch (Exception e) {
            System.err.println("Server exception: " + e.toString());
            e.printStackTrace();
        }
    }
}