fault details

hello,

can someone explain why the WSRP fault types do not have a details, 
reason, cause, message, etc field?

we've noticed that the faults from BEA's producers come across with a 
"details" section in the soap fault. this is most helpful and we'd like 
to replicate that behavior. however, since the wsrp fault types do not 
have such a field this producer must be doing something like inserting 
the details manually into the soap fault, or modifying the wsrp types to 
include details.

it is also possible that the producer's implementation causes the WSRP 
fault types to extend SOAPFaultException, which allows details to be 
added. however, we are using jaxrpc and our jaxrpc expert assures us 
that this violates the spec ... all application faults must extend 
Exception.

any help is appreciated.
thanks.