Soap with Attachments - Unmarshalling Error

package de;

import javax.jws.WebMethod;
import javax.jws.WebParam;
import javax.jws.WebService;
import javax.xml.soap.AttachmentPart;
import javax.xml.soap.SOAPException;
import javax.xml.soap.SOAPMessage;

@WebService(targetNamespace = "http://de/", endpointInterface = "de.EndPoint", portName = "WebServicePort", serviceName = "WebServiceService")
public class test implements EndPoint{

	@WebMethod(operationName = "create", action = "urn:Create")
	public String create(@WebParam(name = "arg0") SOAPMessage message) {

		java.util.Iterator iterator = message.getAttachments();
		while (iterator.hasNext()) {
			AttachmentPart attachment = (AttachmentPart) iterator.next();
			String id = attachment.getContentId();
			String type = attachment.getContentType();
			if (type.equals("text/plain")) {
				Object content = null;
				try {
					content = attachment.getContent();
				} catch (SOAPException e) {
					e.printStackTrace();
				}
				System.out.println("Attachment contains:\n" + content);
			}
		}
		return "CREATED!";
	}
}

<?xml version="1.0" encoding="UTF-8"?>
<wsdl:definitions name="WebServiceService" targetNamespace="http://de/" xmlns:wsdl="http://schemas.xmlsoap.org/wsdl/" xmlns:tns="http://de/" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:soap12="http://schemas.xmlsoap.org/wsdl/soap12/">
  <wsdl:types>
    <schema xmlns="http://www.w3.org/2001/XMLSchema">
<import namespace="http://de/" schemaLocation="webservice_schema1.xsd"/>
</schema>
  </wsdl:types>
  <wsdl:message name="createResponse">
    <wsdl:part name="parameters" element="tns:createResponse">
    </wsdl:part>
  </wsdl:message>
  <wsdl:message name="create">
    <wsdl:part name="parameters" element="tns:create">
    </wsdl:part>
  </wsdl:message>
  <wsdl:portType name="EndPoint">
    <wsdl:operation name="create">
      <wsdl:input name="create" message="tns:create">
    </wsdl:input>
      <wsdl:output name="createResponse" message="tns:createResponse">
    </wsdl:output>
    </wsdl:operation>
  </wsdl:portType>
  <wsdl:binding name="WebServiceServiceSoapBinding" type="tns:EndPoint">
    <soap12:binding style="document" transport="http://schemas.xmlsoap.org/soap/http"/>
    <wsdl:operation name="create">
      <soap12:operation soapAction="urn:Create" style="document"/>
      <wsdl:input name="create">
        <soap12:body use="literal"/>
      </wsdl:input>
      <wsdl:output name="createResponse">
        <soap12:body use="literal"/>
      </wsdl:output>
    </wsdl:operation>
  </wsdl:binding>
  <wsdl:service name="WebServiceService">
    <wsdl:port name="WebServicePort" binding="tns:WebServiceServiceSoapBinding">
      <soap12:address location="http://localhost:8080/WebServiceSOAP/services/WebServicePort"/>
    </wsdl:port>
  </wsdl:service>
</wsdl:definitions>

<?xml version="1.0" encoding="utf-8"?><xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema" xmlns:tns="http://de/" elementFormDefault="unqualified" targetNamespace="http://de/" version="1.0">
<xs:element name="create" type="tns:create"/>
<xs:element name="createResponse" type="tns:createResponse"/>
<xs:complexType name="create">
    <xs:sequence>
      <xs:element minOccurs="0" name="arg0" type="tns:soapMessage"/>
    </xs:sequence>
  </xs:complexType>
<xs:complexType abstract="true" name="soapMessage">
    <xs:sequence>
      <xs:element minOccurs="0" name="contentDescription" type="xs:string"/>
    </xs:sequence>
  </xs:complexType>
<xs:complexType name="createResponse">
    <xs:sequence>
      <xs:element minOccurs="0" name="return" type="xs:string"/>
    </xs:sequence>
  </xs:complexType>
</xs:schema>

import javax.jws.WebMethod;
import javax.jws.WebParam;
import javax.jws.WebService;
import javax.xml.soap.SOAPMessage;
import javax.xml.ws.RequestWrapper;
import javax.xml.ws.ResponseWrapper;

@WebService(name = "EndPoint", targetNamespace = "http://de/")
public interface EndPoint {

	@WebMethod(operationName = "create", action = "urn:Create")
	public String create(@WebParam(name = "arg0") SOAPMessage message);

}

	public static void create() throws Exception {
		QName serviceName = new QName("http://de/", "WebServiceService");
		QName portName = new QName("http://de/", "WebServicePort");

		Service service = Service.create(serviceName);
		service.addPort(portName, SOAPBinding.SOAP11HTTP_BINDING,
				"http://localhost:8080/WebServiceSOAP/services/WebServicePort?wsdl");
		de.EndPoint client = service.getPort(portName, de.EndPoint.class);

		MessageFactory factory = MessageFactory.newInstance(SOAPConstants.SOAP_1_2_PROTOCOL);
		SOAPMessage message = factory.createMessage();
		AttachmentPart attachment = message.createAttachmentPart();
		String stringContent = "Update address for Sunny Skies " +
			    "Inc., to 10 Upbeat Street, Pleasant Grove, CA 95439";

			attachment.setContent(stringContent, "text/plain");
			attachment.setContentId("update_address");
			message.addAttachmentPart(attachment);

		String response = client.create(message);
		System.out.println("SOAP Response: " + response);
	}