I have the same issue. I have 8310 Blackberry and my application is very simple. I am calling a web service and application works fine if I run it in mobile phone emulator (NetBeans IDE 6.1 and Sun Java(TM) Wireless Toolkit 2.5.2 for CLDC) but if I run the application in Blackberry emulator (BlackBerry JDE 4.5) I am getting error message 'JVM Error 104 Uncought: JAXRPCException'. I deployed the application on real device and if I try to run it I am getting error message 'Class java.rmi.RemoteException not found'. What did I do wrong?