Why doesn't JAXB want to validate

  • I wrote some Java classes and annotated them with the JAXB annotations.
  • After that I used schemagen to generate an xsd.
  • Then I build an object graph and marshalled it to a xml file.
  • I modified the xml file so that it was not valid anymore.
  • I wanted to use the xsd in the hope the JAXB unmarshalling fails. But it doesn't. Why?

    JAXB is reading a schema (if the schema XML is wrong JAXB gives an exception) but it seams that JAXB is ignoring the schema while reading.

     SchemaFactory sf = SchemaFactory.newInstance(javax.xml.XMLConstants.W3C_XML_SCHEMA_NS_URI);
     Schema schema = sf.newSchema(getClass().getResource( "/schema1.xsd"));
     JAXBContext context = JAXBContext.newInstance(Customer.class);
     Unmarshaller unmarshaller = context.createUnmarshaller();
     unmarshaller.setSchema( schema );
    
     Customer c = JAXB.unmarshal(file, Customer.class);
    

    The written XML starts like that:

     <?xml version="1.0" encoding="UTF-8" standalone="yes"?>
     <ns2:customer xmlns:ns2="http://bla.com/">
    

    Even the attached ValidationEventCollector didn't give any information:

     unmarshaller.setEventHandler(new JAXBEventCollector());
    

    JAXBEventCollector is:

     class JAXBEventCollector extends ValidationEventCollector
     {
       @Override
       public boolean handleEvent(ValidationEvent event)
       {
           System.out.println(event.getLocator());
           return true;
       }
     }
    

    Your code should work. A couple of things to look out for:

  • Is the URL for your schema coming back as null?
  • Is your last line a typo "JAXB.unmarshal(file, Customer.class)", or is JAXB another unmarshaller without a schema set on it.
  • Below is a fragment of code that definitely throws errors when invalid XML is unmrshalled. This code works correctly with both the MOXy and Metro (RI) JAXB implementations.

    public static void main(String[] args) throws Exception  {
        SchemaFactory sf = SchemaFactory.newInstance(javax.xml.XMLConstants.W3C_XML_SCHEMA_NS_URI);
        File xsd = new File("customer.xsd");
        Schema schema = sf.newSchema(xsd); 
        JAXBContext context = JAXBContext.newInstance(Customer.class);
        Unmarshaller unmarshaller = context.createUnmarshaller(); 
        unmarshaller.setSchema( schema ); 
    
        FileInputStream xml = new FileInputStream("invalid.xml");
        unmarshaller.unmarshal(xml);
    }
    

    With Metro the error looks like:

    Exception in thread "main" javax.xml.bind.UnmarshalException
     - with linked exception:
    [org.xml.sax.SAXParseException: cvc-complex-type.2.4.a: Invalid content was found starting with element 'phone-numbers'. One of '{phoneNumbers}' is expected.]
        at javax.xml.bind.helpers.AbstractUnmarshallerImpl.createUnmarshalException(AbstractUnmarshallerImpl.java:315)
        at com.sun.xml.bind.v2.runtime.unmarshaller.UnmarshallerImpl.createUnmarshalException(UnmarshallerImpl.java:514)
        at com.sun.xml.bind.v2.runtime.unmarshaller.UnmarshallerImpl.unmarshal0(UnmarshallerImpl.java:215)
        at com.sun.xml.bind.v2.runtime.unmarshaller.UnmarshallerImpl.unmarshal(UnmarshallerImpl.java:184)
        at javax.xml.bind.helpers.AbstractUnmarshallerImpl.unmarshal(AbstractUnmarshallerImpl.java:137)
        at javax.xml.bind.helpers.AbstractUnmarshallerImpl.unmarshal(AbstractUnmarshallerImpl.java:184)
        at example.gettingstarted.Demo2.main(Demo2.java:23)
    

    With MOXy the error looks like:

    Exception in thread "main" javax.xml.bind.UnmarshalException
     - with linked exception:
    [Exception [EclipseLink-25004] (Eclipse Persistence Services - 2.0.3.qualifier): org.eclipse.persistence.exceptions.XMLMarshalException
    Exception Description: An error occurred unmarshalling the document
    Internal Exception: org.xml.sax.SAXParseException: cvc-complex-type.2.4.a: Invalid content was found starting with element 'phone-numbers'. One of '{phoneNumbers}' is expected.]
        at org.eclipse.persistence.jaxb.JAXBUnmarshaller.unmarshal(JAXBUnmarshaller.java:114)
        at example.gettingstarted.Demo2.main(Demo2.java:23)
    
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