Compiling error reading RMI implemntation fil

Question

i want to my 1st rmi program but cant compile
1st file Hello.java
package examples.hello;
import java.rmi.Remote;
import java.rmi.RemoteException;
public interface Hello extends Remote {
String sayHello() throws RemoteException;
this file compiles correctly
but 2nd one HelloImp1.java
package examples.hello;
import java.rmi.Naming;
import java.rmi.RemoteException;
import java.rmi.RMISecurityManager;
import java.rmi.server.UnicastRemoteObject;
public class HelloImpl extends UnicastRemoteObject
implements Hello {
public HelloImpl() throws RemoteException {
super();
public String sayHello() {
return "Hello World!";
public static void main(String args[]) {
// Create and install a security manager
if (System.getSecurityManager() == null) {
     System.setSecurityManager(new RMISecurityManager());
try {
     HelloImpl obj = new HelloImpl();
     // Bind this object instance to the name "HelloServer"
     Naming.rebind("HelloServer", obj);
     System.out.println("HelloServer bound in registry");
} catch (Exception e) {
     System.out.println("HelloImpl err: " + e.getMessage());
     e.printStackTrace();
wont compile it gives error
cannot read file HelloImp1.java
error 1
Plz help me

Answer 1

Looks like you have a discrepancy in the file name vs the class it contains - hellImpl vs helloImp1