Trying to call a method on an RMI server from a GUI

Hi all, I'm new to the forums and I desperately need some help!
My question fits into the RMI category but also the database/GUI side so sorry if this is posted in the wrong place.
My application is a client/server system (programmed in Netbeans 6.8) that also uses GUIs and JDBC-ODBC. Basically, I am trying to call a method that adds an entry to my database from a GUI button.
Due to the required RMI, I have the ServerInterface that extends Remote and I have a ServerImpl class that implements the Interface, and the RMI works fine so there is no problem there.
My code for the button is:
private void addUserActionPerformed(java.awt.event.ActionEvent evt) {
try{server.addNewUser("new");}
catch(Exception e){}
addUser.setText("buttonhaschanged");
The server variable is declared above as ServerImpl server;
The actual addNewUser method works fine when it is called explicitly via RMI in my main "Client" class, but this GUI is going to be like an "administrator GUI" that can manipulate the database, so there is no RMI involved here.
Anyway, my button doesn't have any effect on the database, but the button changes text as desired so the button itself works, but it doesn't do what I want to the database, so I think my problem is the use of my "server" variable. I've tried making it static and I've tried making it of type ServerInterface, but no luck. Would I have to make the GUI class extend the interface too?
Sorry for rambling on!
Many thanks in advance
David
Edited by: DHD on Feb 26, 2010 6:15 AM

Would I have to make the GUI class extend the interface too?Your GUI has nothing to do with the RMI. How did you obtaint the "server" ? have you looked in the RMI registry to get the stub object ?
The second thing to notice is you are invoking a RMI calls on a EDT which you should not do it. Your RMI method calls should be invoked via SwingWorker-->doInBackground(); please take a look at the Java Doc
[http://java.sun.com/javase/6/docs/api/javax/swing/SwingWorker.html|java Doc SwingWorker sample usage]
You mentioned that the RMI method invocation works fine from the main class and not from the GUI so what did you do in the main class to get the stub do it in the doInBackground() method
Regards,
Alan
London

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