Question

I have created a Structure for my XML to work with JAXB Unmarshalling
The problem is taht , the Unmarshaller is not being getting created .

JAXBContext jc =  JAXBContext.newInstance("A Fully qualified class name");
Unmarshaller um =  jc.createUnmarshaller();

java.lang.NullPointerException is being thrown at 
Unmarshaller um =  jc.createUnmarshaller();

There is nothing on to the statcktrace except java.lang.NullPointerException , so cant able to debug it also .
Could anybody please tell me how to solve this during creating a Unmarshaller ?? for JAXB 2.0

For refernece this is my Parser class

public class BADFMMessageParser  {
private static JAXBContext jc = null;
    static {
        try {
        jc = JAXBContext.newInstance("My Fully Qualified class name");
        } catch (Exception x) {
        }
    }
    public static MyClass parse(String str) throws Exception {
        Unmarshaller um = jc.createUnmarshaller();
        BADFM  badfmMessage = (BADFM) um.unmarshal(new StringReader(requestStr));
        JAXBElement<? extends MyClass> value = badfmMessage.getMessage();
        return value.getValue();
    }
}

Answer 1

I’m not sure why you are seeing a NPE, but you appear to be creating your JAXBContext incorrectly. You could do the following assuming you had a jaxb.index file or ObjectFactory class in the specified package:

JAXBContext jc =  JAXBContext.newInstance("your.domain.model.package");

Otherwise you could create your JAXBContext directly on the class or classes:

JAXBContext jc = JAXBContext.newInstance(Foo.class,Bar.class);

jaxb.index File Example

• http://blog.bdoughan.com/2010/08/using-xmlanyelement-to-build-generic.html

Bootstrap JAXBContext on Generated Model Example

• http://blog.bdoughan.com/2010/09/processing-atom-feeds-with-jaxb.html

Bootstap JAXBContext from Classes Example

• http://blog.bdoughan.com/2010/09/jaxb-collection-properties.html