title: Netbeans with JAXB Random ClassCastException ..cannot be cast to com.sun.xml.bind.v2.runtime.reflect.Accessor
body: <p>I have downloaded the Soap messages from a SOAP Service and trying to mock the Soap service by returning the downloaded messages. the following code shows how I am Unmarshalling the Soap message into the required Response</p>
  
  <pre><code>    public static DataClientType unmarshallFile(String fileName) throws Exception {
      XMLInputFactory xif = XMLInputFactory.newFactory();
      XMLStreamReader xsr = xif.createXMLStreamReader(ClientSampleSoapResponseData.class.getResourceAsStream(fileName));
      xsr.nextTag(); // Advance to Envelope tag
      xsr.nextTag(); // Advance to Header
      xsr.nextTag(); // Advance to Body tag
      xsr.nextTag(); // Advance to getClientByAccountResponse
      xsr.nextTag(); // Advance to content of getClientByAccountResponse
  
      JAXBContext jc = JAXBContext.newInstance(GetClientByAccountResponse.class);
      Unmarshaller unmarshaller = jc.createUnmarshaller();
      JAXBElement&lt;GetClientByAccountResponse&gt; je = unmarshaller.unmarshal(xsr, GetClientByAccountResponse.class);
  
      return je.getValue().getClientDataContract();
  }
  </code></pre>
  
  <p>However I keep getting this ClassCastExeption which happens randomly. After a number of test iterations, it begins to happen. Sometimes a clean and build fixes it but sometimes it doesn't work.</p>
  
  <pre><code>java.lang.ClassCastException: com.x.X.X.X.GetClientByAccountResponse$JaxbAccessorF_clientDataContract cannot be cast to com.sun.xml.bind.v2.runtime.reflect.Accessor
  at com.sun.xml.bind.v2.runtime.reflect.opt.OptimizedAccessorFactory.instanciate(OptimizedAccessorFactory.java:188)
  at com.sun.xml.bind.v2.runtime.reflect.opt.OptimizedAccessorFactory.get(OptimizedAccessorFactory.java:180)
  at com.sun.xml.bind.v2.runtime.reflect.Accessor$FieldReflection.optimize(Accessor.java:256)
  at com.sun.xml.bind.v2.runtime.property.SingleElementNodeProperty.&lt;init&gt;(SingleElementNodeProperty.java:90)
  </code></pre>
  
  <p>I have tried other online suggestions such as reverting to old jaxb versions and using endorsed folders in the maven compiler configuration but it still happens</p>
  
  <p>Any ideas on what could be causing it and possible solutions?</p>
  
  <p>Thank u</p>