How to use generics in argument need class

Question

In my example JAXBContext.newInstance(T) need paramether Class and this solution with generics not works.

public class SerializationUtilJaxb<T> {

    public String serialize(T jaxbObject) {
        StringWriter stringWriter = new StringWriter();
        try {
            JAXBContext jaxbContext = JAXBContext.newInstance(T);
            Marshaller objectMarshaller = jaxbContext.createMarshaller();
            objectMarshaller.marshal(jaxbObject, stringWriter);
            return stringWriter.toString();
        } catch (JAXBException e) {
            throw new RuntimeException(e);
        }
    }
}

Can I ask why? And what is correct solution with generics?

ulab · Accepted Answer · 2016-08-19 14:14:13Z

1

Use unbounded wildcard ? instead.

public static void SerializationUtilJaxb(Class<?> rootClass, Object rootObj) throws JAXBException, IOException{

        try{
            StringWriter stringWriter = new StringWriter();
            JAXBContext context = JAXBContext.newInstance(rootClass);
            Marshaller m = context.createMarshaller();      
            m.setProperty(Marshaller.JAXB_FORMATTED_OUTPUT, Boolean.TRUE);
            m.setProperty(Marshaller.JAXB_ENCODING, "UTF-8");
            m.marshal(rootObj, stringwriter);
        }
        catch(Exception e){
            // System.out.println (e.getMessage);
            throw e;
        }
    }

answered Aug 19, 2016 at 14:14

ulab

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