Parameter to Operation is always null

[Ted Jones]

Whenever I invoke an operation for a particular web service, the
parameter is always null. I am passing the correct values in the soap
request, but they never seem to make to the invoked operation. The
parameter is a java object and defined as a complex type in my schema.
Do I need to somehow map the java object type to the parameter in my
wsdl? Has anyone else encountered this before? 
 
TIA,
Ted