This week's book giveaway is in the OCAJP 8 forum. We're giving away four copies of OCA Java SE 8 Programmer I Study Guide and have Edward Finegan & Robert Liguori on-line! See this thread for details.
Although there is a interface Handler (in javax.xml.ws.handler package) which extended by both SOAPHandler and LogicalHandler, we do not usually use it directly as a 'Generic Handler' interface. Since SOAP is the only protocol available for JAX-WS standard WebServices, you can say " SOAPHandler to be a specific case of Protocol Handler"