Today I was faced with the situation that I needed to log the SOAP requests and responses going in and out from a Java client. I just had the client jar no source code so I can’t any any log or change any other configuration. I needed to log the request and response because I was getting some weird exceptions which I was not able to understand. I got the hold of the SOAP request by passing a Java property
java -Dcom.sun.xml.internal.ws.transport.http.client.HttpTransportPipe.dump=true -jar client.jar
Shekhar Gulati 
Just what I searched for. Thx!