Description David McCann 2011-01-06 16:07:06 EST

When a JAXBContext is bootstrapped from a TypeMappingInfo[], one of three marshal methods on our JAXBMarshaller should be used to marshal:

- marshal(Object object, Result result, TypeMappingInfo type)
- marshal(Object object, XMLEventWriter eventWriter, TypeMappingInfo type)
- marshal(Object object, XMLStreamWriter streamWriter, TypeMappingInfo type)

If one of these is not used, and EclipseLink encounters something it can't marshal as-is, such as Float[], the following exception will be thrown:

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Exception in thread "main" java.lang.NullPointerException
	at org.eclipse.persistence.jaxb.JAXBMarshaller.createXMLRootFromJAXBElement(JAXBMarshaller.java:150)
	at org.eclipse.persistence.jaxb.JAXBMarshaller.marshal(JAXBMarshaller.java:309)
	at testing.XmlListTest.main(XmlListTest.java:44)
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This null pointer exception should bot be thrown;  we should handle this scenario using a JAXBException with a helpful message.

The following test case can be used to reproduce the exception:

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public class XmlListTest {
  public static Float[] f = new Float[] { 3.14f };

  public static void main(String[] args) throws Exception {
    TypeMappingInfo ti = new TypeMappingInfo();
    ti.setXmlTagName(new QName("FooFloatListType"));
    ti.setType(Float[].class);
    ti.setElementScope(ElementScope.Global);

    JAXBContext ctx = JAXBContextFactory.createContext(
        new TypeMappingInfo[] { ti }, 
        new HashMap<Object, Object>(),
        Thread.currentThread().getContextClassLoader());
		
    JAXBElement<Float[]> elt = new JAXBElement<Float[]>(
        ti.getXmlTagName(), Float[].class, f);

    Marshaller m = ctx.createMarshaller();
    m.marshal(elt, System.out);
  }
}
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