what i mean by "simple XML Over HTTP " is i don't want to send soap message as request to webservice . rather i want to send a request in XML over HTTP and expecting response in XML .
But a SOAP message IS already XML. Perhaps you mean you don't want to fiddle with SOAP client software - understandable.
Like Tim said, a SOAP server is only going to respond to a SOAP formatted message and generate a SOAP formatted response.
Some SOAP services publish an example of a request the service can respond to - you can generate such a message in a variety of ways including using a regular java.net.HttpURLConnection.
Bill