import javax.xml.soap.*;
import java.io.*;
import java.nio.charset.Charset;

public class TestUtf16 {

    private static final String CHARSET = "UTF-16";
    private static final String MESSAGE = "<?xml version='1.0' encoding='" + CHARSET + "'?><S:Envelope xmlns:S=\"http://schemas.xmlsoap.org/soap/envelope/\"><S:Body><ns3:echoNoAttachmentsResponse xmlns:ns3=\"http://SwaTestService.org/wsdl\" xmlns:ns2=\"http://SwaTestService.org/xsd\"><result>Hello</result></ns3:echoNoAttachmentsResponse></S:Body></S:Envelope>";

    public static void main(String args[]) {
        try {
            System.setProperty("javax.xml.transform.TransformerFactory", "com.sun.org.apache.xalan.internal.xsltc.trax.TransformerFactoryImpl");

            ByteArrayInputStream inputStreamForString = getInputStreamForString(MESSAGE, Charset.forName(CHARSET));

            SOAPMessage message = createSOAPMessage(inputStreamForString);

            System.out.println(getResponseAsString(message));

            SOAPPart soapPart = message.getSOAPPart();
            // TODO The call soapPart.getEnvelope() below fails.
            SOAPEnvelope envelope = soapPart.getEnvelope();
            SOAPBody body = envelope.getBody();

            System.out.println(body);

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

    private static String getResponseAsString(SOAPMessage response) throws SOAPException, IOException {
        if (response == null) return null;
        ByteArrayOutputStream baos = new ByteArrayOutputStream();
        response.writeTo(baos);
        return baos.toString();
    }

    private static SOAPMessage createSOAPMessage(InputStream is) {
        SOAPMessage message = null;
        MimeHeaders headers = new MimeHeaders();
        // TODO Comment this line to make the test pass.
        headers.addHeader("Content-Type", "text/xml; charset=" + CHARSET);
        try {
            MessageFactory messageFactory = MessageFactory.newInstance();
            message = messageFactory.createMessage(headers, is);
            message.saveChanges();
        } catch (Exception e) {
            e.printStackTrace();
            message = null;
        }
        return message;
    }

    private static ByteArrayInputStream getInputStreamForString(String request, Charset cs) throws IOException {
        ByteArrayOutputStream bos = new ByteArrayOutputStream();
        OutputStreamWriter osw;
        if (cs != null) {
            osw = new OutputStreamWriter(bos, cs);
        } else {
            osw = new OutputStreamWriter(bos, Charset.forName("UTF-8"));
        }
        osw.write(request);
        osw.flush();
        ByteArrayInputStream bis = new ByteArrayInputStream(bos.toByteArray());
        return bis;
    }

}