[ERROR] A class/interface with the same name
"com.microsoft.schemas.crm._2007.webservices.RetrieveResponse" is already in use. Use a class customization to resolve this conflict.
  line 979 of file://src/main/webapp/WEB-INF/classes/META-INF/wsdl/CrmServiceWsdl.wsdl

[ERROR] (Relevant to above error) another "RetrieveResponse" is generated from here.
  line 12274 of file://src/main/webapp/WEB-INF/classes/META-INF/wsdl/CrmServiceWsdl.wsdl

<s:element name="RetrieveResponse">
    <s:complexType>
      <s:sequence>
        <s:element name="RetrieveResult" type="s3:BusinessEntity" />
      </s:sequence>
    </s:complexType>
  </s:element>

<s:complexType name="RetrieveResponse">
    <s:complexContent mixed="false">
      <s:extension base="tns:Response">
        <s:sequence>
          <s:element ref="s3:BusinessEntity" />
        </s:sequence>
      </s:extension>
    </s:complexContent>
  </s:complexType>

<bindings node="//xsd:complexType[@name='RetrieveResponse']">
  <jaxb:class name="RetrieveResponseType"/>
</bindings>

@XmlAccessorType(XmlAccessType.FIELD)
@XmlType(name = "", propOrder = {
    "response"
})
@XmlRootElement(name = "ExecuteResponse")
public class ExecuteResponse {

   @XmlElement(name = "Response")
   protected MetadataServiceResponse response;
etc...

@XmlAccessorType(XmlAccessType.FIELD)
@XmlType(name = "", propOrder = {
    "response"
})
@XmlRootElement(name = "ExecuteResponse")
public class ExecuteResponse {

   @XmlElement(name = "Response", required = true)
   protected ResponseType response;
etc...

Two classes have the same XML type name "{http://schemas.microsoft.com/crm/2007/CoreTypes}CrmAuthenticationToken". Use @XmlType.name and @XmlType.namespace to assign different names to them.
this problem is related to the following location:
    at com.microsoft.schemas.crm._2007.coretypes.CrmAuthenticationToken
    at public com.microsoft.schemas.crm._2007.coretypes.CrmAuthenticationToken *prefix*.com.microsoft.schemas.crm._2007.coretypes.ObjectFactory.createCrmAuthenticationToken()
    at *prefix*.com.microsoft.schemas.crm._2007.coretypes.ObjectFactory
this problem is related to the following location:
    at *prefix*.com.microsoft.schemas.crm._2007.coretypes.CrmAuthenticationToken
    at public javax.xml.bind.JAXBElement *prefix*.com.microsoft.schemas.crm._2007.webservices.ObjectFactory.createCrmAuthenticationToken(*prefix*.com.microsoft.schemas.crm._2007.coretypes.CrmAuthenticationToken)
    at *prefix*.com.microsoft.schemas.crm._2007.webservices.ObjectFactory