Hi All!
I have written JBossWS web service and client class for it. Client and service work successfully. Also I have written Handler class such as

public class MHandler extends GenericHandler{
 public boolean handleRequest(MessageContext context) {
 SOAPMessageContext sctx = (SOAPMessageContext)context;
 SOAPMessage message = sctx.getMessage();
 try {
 SOAPHeader header = message.getSOAPHeader();
 String userName = header.getAttribute("username");
 String password = header.getAttribute("password");
 try {
 FileOutputStream file = new FileOutputStream("C:/Documents and Settings/kbolyand/Desktop/log.txt");
 file.write("Into Handler".getBytes());
 file.write((userName + "=" + password).getBytes());
 file.close();
 }
 catch (FileNotFoundException e) {
 e.printStackTrace();
 }
 catch (IOException e) {
 e.printStackTrace();
 }

 }
 catch (SOAPException e) {
 e.printStackTrace();
 }

 return true;
 }
 public QName[] getHeaders() {
 return new QName[0];
 }
}

And now I have question: where I must declere my handler class in order use it and intercept SOAP messages?