Handling connection errors

Question

Hi,
I'm working in a client/server application. The server side is EJB 3.0 based and the client side is a simple GUI with connection properties, everyone working in a different computer.
Because of this, I want to handle all connection problems and report it to the user, by the moment I use to "throw" all errors up and then catch them and pop-up a message.
For example, at the begining it builds a tree -using a treeviewer-, and if the program couldn't connect, it prints a message and asks to try again or cancel. Later there is a menu option where you can refresh this view.
The problem is when I have been connected and I disconnect -manually- the network connection of the server, then I try to delete one of the tree objects -it needs to connect to the server for removing the entity- but in front of throwing a exception, it hangs and I have to kill the application and execute it again.
The code that hangs:
------------------------------------- Start of code ----------------------------------------
public class ComunicacioEJB {
     private static facadeEJB.RedFacadeRemote redfacade;
public ComunicacioEJB() throws javax.naming.NamingException {
          c = Context();
lookupRedFacade();
private void lookupRedFacade() throws javax.naming.NamingException{
          /* exacly hangs here --> */ redfacade = (facadeEJB.RedFacadeRemote) c.lookup("RedFacade/remote");
-------------------------------- End of code ------------------------------------------
The context is loaded in another function.
Do you have any idea of why is this happening? Why it throws if the connection problem is at the start of the program but hangs if the connection problem is once you have been connected before?
Also it happens if I try to refresh the view or wharever I try.
Thanks for reading.
Miquel

Answer 1

Hi again,
I haven't found solution yet, but I'm thinking on having a timer or similar for the connection, once this timer ends the funcion throws an exception for timeout.
I will try and I say to you