Getting serailization exeception when starting the server

Question

Hi All,
I succesfully got the "ComputeEngine" running from the basic RMI tutorial.
I then began reating my own classes based on the tutorial, which is still basically copied code from ComputeEngine.java.
For some reason when when I try to start my server class I get a "Not serializable" exception. This can be fixed by adding "implements Serializable" to my class. But what I'm confused about is that the ComputeEngine class from the tutorial does not require the "implements Serializable". Why does mine require it?
Anyone have any ideas?
Here is my code:
public class RemoteExecuteServer implements RemoteExecute, Serializable {
    public RemoteExecuteServer() throws RemoteException {
        super();
    public Object executeRunnable() throws RemoteException {
        System.out.println("Hello, this is the server.");
        return null;
    public static void main(String[] args) {
        if (System.getSecurityManager() == null) {
            System.setSecurityManager(new RMISecurityManager());
        // TODO: Get the server name from a config file
        String name = "//sunxxx/RemoteExecuteServer";
        try {
            RemoteExecute engine = new RemoteExecuteServer();
            Naming.rebind(name, engine);
            System.out.println("RemoteExecuteServer bound");
        } catch (Exception e) {
            System.err.println("RemoteExecuteServer exception: " +
                      e.getMessage());
            e.printStackTrace();
}

Answer 1

Never mind,
I wasn't extending UnicastRemoteObject. Thanks anyway.