Adding User/Password to SOAPHeader for WebService client call with AXIS2
<wsse:Security soapenv:mustUnderstand="1" xmlns:wsse="http://docs.oasis-open.org/wss/2004/01/oasis-200401-wss-wssecurity-secext-1.0.xsd"><wsse:UsernameToken wsu:Id="UsernameToken-3" xmlns:wsu="http://docs.oasis-open.org/wss/2004/01/oasis-200401-wss-wssecurity-utility-1.0.xsd"><wsse:Username>testuser</wsse:Username><wsse:Password Type="http://docs.oasis-open.org/wss/2004/01/oasis-200401-wss-username-token-profile-1.0#PasswordText">testpassword&</wsse:Password><wsse:Nonce EncodingType="http://docs.oasis-open.org/wss/2004/01/oasis-200401-wss-soap-message-security-1.0#Base64Binary">RYadQak91mr7dB+5hyt8yw==</wsse:Nonce><wsu:Created>2011-10-24T20:13:43.039Z</wsu:Created></wsse:UsernameToken>
</wsse:Security>

org.tempuri.myService.MyServiceStub stub = new  org.tempuri.myService.MyServiceStub();

ServiceClient sc = stub._getServiceClient();
HttpTransportProperties.Authenticator auth = new HttpTransportProperties.Authenticator();
auth.setUsername("testuser");
auth.setPassword("password$");

sc.getOptions().setProperty(org.apache.axis2.transport.http.HTTPConstants.AUTHENTICATE,auth);

org.tempuri.myService.MyServiceDocument myService4 = (org.tempuri.myService.MyServiceDocument)getTestObject(org.tempuri.myService.MyServiceDocument.class);

MyService lval = MyService4.addNewMyService();

MyServiceParameters lvParams = lval.addNewParameters();
lvParams.setA("24");
lvParams.setB("10");

lval.setParameters(lvParams);
myService4.setMyService(lval);

org.apache.axis2.AxisFault: Exception occurred while executing service 'MyService'.
    at org.apache.axis2.util.Utils.getInboundFaultFromMessageContext(Utils.java:531)
    at org.apache.axis2.description.OutInAxisOperationClient.handleResponse(OutInAxisOperation.java:375)
    at org.apache.axis2.description.OutInAxisOperationClient.send(OutInAxisOperation.java:421)
    at org.apache.axis2.description.OutInAxisOperationClient.executeImpl(OutInAxisOperation.java:229)
    at org.apache.axis2.client.OperationClient.execute(OperationClient.java:165)
    at org.tempuri.myService.MyServiceStub.myService(MyServiceStub.java:182)
    at org.tempuri.myService.MyServiceTest.main(MyServiceTest.java:55)

MyServiceResponseDocument lvdoc = stub.myService(myService4);

OMFactory omFactory = OMAbstractFactory.getOMFactory();
OMElement omSecurityElement = omFactory.createOMElement(new QName( "http://docs.oasis-open.org/wss/2004/01/oasis-200401-wss-wssecurity-secext-1.0.xsd", "Security", "wsse"), null);


OMElement omusertoken = omFactory.createOMElement(new QName("http://docs.oasis-open.org/wss/2004/01/oasis-200401-wss-wssecurity-utility-1.0.xsd", "UsernameToken", "wsu"), null);

OMElement omuserName = omFactory.createOMElement(new QName("", "Username", "wsse"), null);
omuserName.setText("myusername");

OMElement omPassword = omFactory.createOMElement(new QName("", "Password", "wsse"), null);
omPassword.addAttribute("Type","http://docs.oasis-open.org/wss/2004/01/oasis-200401-wss-username-token-profile-1.0#PasswordText",null );
omPassword.setText("mypassword");

omusertoken.addChild(omuserName);
omusertoken.addChild(omPassword);
omSecurityElement.addChild(omusertoken);
stub._getServiceClient().addHeader(omSecurityElement);