Invokes an operation occording to the contents of the request message.

  Invokes an operation occording to the contents of the request
message.
Returns: The response message or message payload. May be null if there is no response.
Parameters:
- request - The request message or message payload.
Throws:
- WebServiceException - if there is an error processing request. The cause of the WebServiceException may be set to a subclass of ProtocolException to control the protocol level representation of the exception.
See Also: MessageContext, ProtocolException,