I am not sure it is possible to skip the stack trace. I have just looked to the AxisFault code and it seems that fault details will always be filled with the stack trace (see the initFromException(Exception target) method).
I think there may be a flag you can set that turns off the sending of stack traces to the client.
In the *.wsdd file, the flag is named 'useProductionMode' or something like that.
I have vague memories of seeing such a thing on this list, but I may be getting confused.
