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Dynamically adding namespace to SOAP Envelope in Java

I am new to all of this but I am trying to create a SOAP message and get stuck at the off, I am using Java 8 and the standard javax.xml.soap classes but seem unable to add namespaces to the Envelope
MessageFactory factory = MessageFactory.newInstance();
SOAPMessage message = factory.createMessage();
SOAPPart part = message.getSOAPPart();
SOAPEnvelope envelope = part.getEnvelope();
envelope.addNamespaceDeclaration( "xmlns:xsi", "http://www.w3.org/2001/XMLSchema-instance");
If I try this at runtime I get the following error
NAMESPACE_ERR: An attempt is made to create or change an object in a way which is incorrect with regard to namespaces.

I have done this now by creating the required envelope definition as an XML String and then setting the SOAPPart content using that string

Unable to view reply in SOAP call

I'm currently working on a custom SOAP call to a specific domain beyond my control. I know the SOAP call fails but I cannot seem to grab the returned (wrong)value.
Right now I'm using the code below:
Document document = convertStringToDocument(this.MeldingString);
// System.out.println(document);
SOAPConnectionFactory myFct = SOAPConnectionFactory.newInstance();
MessageFactory myMsgFct = MessageFactory.newInstance(SOAPConstants.SOAP_1_2_PROTOCOL);
SOAPMessage message = myMsgFct.createMessage();
SOAPConnection myCon = myFct.createConnection();
// Adding parts
SOAPPart mySPart = message.getSOAPPart();
SOAPEnvelope myEnvp = mySPart.getEnvelope();
// Escape the password for usage in header
String escpwd = StringEscapeUtils.escapeJava(this.Password);
// Header
MimeHeaders headers = message.getMimeHeaders();
headers.setHeader("Content-Type", "application/soap+xml;charset=UTF-8");
headers.setHeader("Authorization", this.Username + ":" + escpwd);
// Body
SOAPBody body = myEnvp.getBody();
body.addDocument(document);
// Sending
Core.getLogger("GetResultSOAPmsg").trace("Started");
URL endPt = new URL(
"URL-TO-MY-SERVICE");
System.setProperty("java.net.useSystemProxies", "true");
try {
SOAPMessage reply = myCon.call(message, endPt); "UTF-8");
}
catch(Exception e)
{
e.printStackTrace();
}
This yields the following error which is very common al throughout SO:
SEVERE: SAAJ0537: Invalid Content-Type. Could be an error message instead of a SOAP message
com.sun.xml.internal.messaging.saaj.SOAPExceptionImpl: com.sun.xml.internal.messaging.saaj.SOAPExceptionImpl: Invalid Content-Type:text/html. Is this an error message instead of a SOAP response?
Now I have read most of these topics already and they explain how this problem is usually solved (namespaces, escaping URL, etc.) but I cannot seem to figure out what is wrong in my case. This is a private service and the other side is unfortunately unable to assist me in this case. The error could be anything from wrong certificates to misspelling the URL.
Therefore I would like to actually SEE onscreen what the actual reply is that was received when making the call. This is going to help me (assuming it's something like a 503, 404 or other page). Regardless of what I do and where I set my breakpoints, there is no information on Reply. It makes somewhat sense since it was unable to create said object but the entire message seems to be discarded.
In what way will I be able to see what the actual reply was to my call before it is discarded?

I think there's a problem with your header
headers.setHeader("Content-Type", "application/soap+xml;charset=UTF-8");
try something like
headers.setHeader("Content-Type", "application/xml;charset=UTF-8");
or
headers.setHeader("Content-Type", "application/json;charset=UTF-8");
depending on the content type that the content type accepted by the service

SOAP response showing error-SAAJ Java

I am having one function where we generate SOAP request.The request I am able to run in SOAP UI tool and its fetching.
I am creating SOAPMessage like this
MessageFactory messageFactory = MessageFactory.newInstance();
SOAPMessage soapMessage = messageFactory.createMessage();
MimeHeaders headers = soapMessage.getMimeHeaders();
headers.removeAllHeaders();
headers.addHeader("Content-Type", "text/xml");
SOAPPart soapPart = soapMessage.getSOAPPart();
When I call
SOAPMessage soapResponse = soapConnection.call(soapMessage, url);
get this error:
SEVERE: SAAJ0537: Invalid Content-Type. Could be an error message instead of a SOAP message
com.sun.xml.internal.messaging.saaj.SOAPExceptionImpl: com.sun.xml.internal.messaging.saaj.SOAPExceptionImpl: Invalid Content-Type:text/html. Is this an error message instead of a SOAP response?
could you help to sort it out?
whether that means connection unable to establish??

Most probably expected HTTP Content-Type header for SOAP messages is application/soap+xml (see XML SOAP).
The exception you get originates from SOAP service container saying that the value of Content-Type header is text/html. I think that SOAP UI set the correct request header value for you.
The header value sent by your code seem to be a default one. You should check what the expected Content-Type value is for you server and ho to set it with your framework/library.

Remove soap header from message response

How do I remove a
<soapenv:Header xmlns:soapenv="http://schemas.xmlsoap.org/soap/envelope/">
node from a response message using Java (or web service configuration)?
I don't want to send back user name and password that is displayed in the header. Do I create a class to extend AbstractSoapInterceptor?
I am using `cxf bus to configure my web service.

I don´t know how are you receiving the SOAP message, but If you can use (or instantiate) a javax.xml.soap.SOAPMessage you remove the header element or attribute that is bothering you:
// Removes the attribute "key" from the message header
message.getSOAPHeader().removeAttribute("key");
Anyway, reusing the same message sounds weird to me, perhaps you should consider creating a new fresh response message:
This statement create a brand new message:
MessageFactory mf = MessageFactory.newInstance();
SOAPMessage message = mf.createMessage(headers, in)
This one, from Mime headers and an inputstream:
MessageFactory mf = MessageFactory.newInstance();
SOAPMessage message = mf.createMessage(headers, in)

JAX-WS get soap without actually sending to a web-service

Using JAX-WS and a custom WSDL, is there a way to get the message that would be sent to a web-service without actually making a call to the service? I need to generate a soap message conforming to a WSDL, but that soap message is actually embedded into another message. I was thinking I could create a local web-service that just echos back the message but it seems like there should be a way without doing this or using a handlerchain when it doens't really matter that the message is sent.
Maybe the easiest thing to do is just to generate the soap manually?

I hope this helps:
http://www.java-tips.org/java-ee-tips/java-api-for-xml-web-services/writing-a-handler-in-jax-ws.html
You can intercept message before being sent, get the body, get the header, sign it with SAML or whatever you want, and then send it to server.

maybe this example helps (from Understanding Web Services, Part 1: SOAP, IBM Developer Works, page 21):
MessageFactory messageFactory = MessageFactory.newInstance();
SOAPMessage message = messageFactory.createMessage();
SOAPPart SOAPPart = message.getSOAPPart();
SOAPEnvelope envelope = SOAPPart.getEnvelope();
SOAPBody body = envelope.getBody();
SOAPElement bodyElement = body.addChildElement(envelope.createName("echo", "req", "http://localhost:8080/axis2/services/MyService/"));
bodyElement.addChildElement("category").addTextNode("classifieds");
message.saveChanges();
SOAPPart SOAPpartbefore = message.getSOAPPart();
SOAPEnvelope reqenv = SOAPpartbefore.getEnvelope();
System.out.println(reqenv.toString());