If you strictly follow the Axis User Guide in section "Naming Parameters" (at the beginning of chapter "Consuming Web Services with Axis"), simply adding a parameter (w/ method addParameter(...)) does not work because it apparently requires the returnType to be defined (w/ method setReturnType(...)).
=> when running, an Axis Fault is generated mentioning that "No returnType was specified to the Call object! You must call setReturnType() if you have called addParameter()."
The issue around addParameter/setReturnType have been mentioned in axis-dev but I don't know if it has been solved.
Maybe this should be mentioned in the user guide.
NB: I'm using version Beta 1.
