Security changes at OS400 5.1

We have just upgraded our development machine to OS 5.1 (a bit late I know!)

Now some code that was working on previous release doesn't work. Relevant
code snippet follows:

            /** if running locally on AS400 no sign on info required
              * if running on PC the sign on prompt appears at point of
connecting
            */
        AS400 sys = new AS400();

        // only uses data queues
        sys.connectService(AS400.DATAQUEUE);


This now throws the following message:

 com.ibm.as400.access.AS400SecurityException: Password is not set.

When running the Java on the old OS400 there was no need to supply password,
is this now mandatory at 5.1, or is there a security setting which will
allow AS400 object to created without password?

Any help greatly appreciated!

Incidentally, does anyone have a good way to supply user ids & passwords for
Java to use without storing this in the code?


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