JAXB Eclipse Link Moxy: ClassCastException while Unmarshalling JSON using schema validation

Question

I am using eclipse link(v2.5.1) Dynamic JAXB to convert XML to JSON and viceversa using a multiple schemas. While umarshalling the JSON to XML,I want to validate the JSON(against the XSD) and Dynamic Moxy is unable to validate the generated JSON and results in classcast exception.

emp.xsd




    

    
        
            
            
        
    


    

        
            
                
                   
                
            
        
    

    
        
            
        
    

    
        
            Abstract base class

Manager.xsd




    
    

    
        
            
                Definition of class Employee
            
        
        
            
                
                    
                    
                
            
        
    


    
        
            
                
                    
                
            
        
    
    
        
            
                Abstract base class for an Development

sample.xml

The driver program to test is as follows

public class XMLToJSON {

    /**
     * @param args
     */
    public static void main(String[] args) {

        FileInputStream xsdInputStream;
        try {
            xsdInputStream = new FileInputStream("Manager.xsd");
            DynamicJAXBContext jaxbContext = DynamicJAXBContextFactory.createContextFromXSD(xsdInputStream, new MyEntityResolver(), null, null);
            FileInputStream xmlInputStream = new FileInputStream("sample.xml");
            Unmarshaller unmarshaller = jaxbContext.createUnmarshaller();
            JAXBElement manager = (JAXBElement) unmarshaller.unmarshal(xmlInputStream);


            Marshaller marshaller = jaxbContext.createMarshaller();
            marshaller.setProperty(Marshaller.JAXB_FORMATTED_OUTPUT, true);
            //input xml to print
            marshaller.marshal(manager, System.out);

            Map namespaces = new HashMap();
            namespaces.put("http://www.w3.org/2001/XMLSchema-instance", "xsi");
            namespaces.put("Employee:2:0", "ns1"); 
            namespaces.put("Manager:1:0", "ns2");

            // XML to JSON
            marshaller.setProperty(Marshaller.JAXB_FORMATTED_OUTPUT, true);
            marshaller.setProperty(MarshallerProperties.MEDIA_TYPE, "application/json");
            marshaller.setProperty(MarshallerProperties.NAMESPACE_PREFIX_MAPPER, namespaces);
            FileOutputStream jsonOutputStream = new FileOutputStream("sample.json");
            marshaller.marshal(manager, jsonOutputStream);
            marshaller.marshal(manager, System.out);

            //JSON to XML
            JAXBUnmarshaller jsonUnmarshaller = jaxbContext.createUnmarshaller();
            jsonUnmarshaller.setProperty(UnmarshallerProperties.MEDIA_TYPE, "application/json");
            jsonUnmarshaller.setProperty(UnmarshallerProperties.JSON_NAMESPACE_PREFIX_MAPPER, namespaces);
            jsonUnmarshaller.setProperty(UnmarshallerProperties.JSON_INCLUDE_ROOT, true);
            jsonUnmarshaller.setProperty(UnmarshallerProperties.JSON_ATTRIBUTE_PREFIX, "@");
            SchemaFactory sf = SchemaFactory.newInstance(XMLConstants.W3C_XML_SCHEMA_NS_URI); 
            Schema schema = sf.newSchema(new File("Manager.xsd")); 
            jsonUnmarshaller.setSchema(schema);
            StreamSource json = new StreamSource("sample.json");
            JAXBElement myroot = (JAXBElement) jsonUnmarshaller.unmarshal(json);
            Marshaller m = jaxbContext.createMarshaller();
            m.setProperty(Marshaller.JAXB_FORMATTED_OUTPUT,true);
            m.marshal(myroot, System.out);

        } catch (FileNotFoundException e) {
            e.printStackTrace();
        } catch (JAXBException e) {
            e.printStackTrace();
        } catch (SAXException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
    }
}

Generated Sample JSON

    {
   "ns1.searchManager" : {
      "CompanyName" : "Test",
      "objects" : [ {
         "xsi.type" : "ns2.Manager",
         "EmpId" : "123456",
         "teamSize" : 10,
         "project1" : [ {
            "type" : 1
         } ]
      } ]
   }
}

While unmarshalling the below exception was seen

Exception in thread "main" java.lang.ClassCastException: org.eclipse.persistence.internal.oxm.record.XMLReaderAdapter$ExtendedContentHandlerAdapter cannot be cast to org.eclipse.persistence.internal.oxm.record.UnmarshalRecord
    at org.eclipse.persistence.internal.oxm.record.json.JSONReader.isTextValue(JSONReader.java:454)
    at org.eclipse.persistence.internal.oxm.record.json.JSONReader.parse(JSONReader.java:350)
    at org.eclipse.persistence.internal.oxm.record.json.JSONReader.parse(JSONReader.java:244)
    at org.eclipse.persistence.internal.oxm.record.json.JSONReader.parse(JSONReader.java:430)
    at org.eclipse.persistence.internal.oxm.record.json.JSONReader.parse(JSONReader.java:299)
    at org.eclipse.persistence.internal.oxm.record.json.JSONReader.parseRoot(JSONReader.java:166)
    at org.eclipse.persistence.internal.oxm.record.json.JSONReader.parse(JSONReader.java:125)
    at org.eclipse.persistence.internal.oxm.record.json.JSONReader.parse(JSONReader.java:140)
    at org.eclipse.persistence.internal.oxm.record.SAXUnmarshaller.unmarshal(SAXUnmarshaller.java:778)
    at org.eclipse.persistence.internal.oxm.record.SAXUnmarshaller.unmarshal(SAXUnmarshaller.java:666)
    at org.eclipse.persistence.oxm.XMLUnmarshaller.unmarshal(XMLUnmarshaller.java:593)
    at org.eclipse.persistence.jaxb.JAXBUnmarshaller.unmarshal(JAXBUnmarshaller.java:287)
    at XMLToJSON.main(XMLToJSON.java:74)

EDIT:Corrected the generated sample json

Question

The intention is to check whether JSON conforms to the XML schema. Does Dynamic JAXB support JSON Validation while unmarshalling? Is this a bug in Dynamic JAXB Moxy?

JAXB Eclipse Link Moxy: ClassCastException while Unmarshalling JSON using schema validation

Answers (1)

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