JAXB creating context and marshallers cost

Question

The question is a bit theoretical, what is the cost of creating JAXB context, marshaller and unmarshaller?

I\'ve found that my code could benefit from keeping the sa

Answer 1

Creating JAXBContext within a enum and accessing it within application Thread to create Marshaller/Unmarshaller will suffice.

public enum MyApplicationJAXBContext {

    REQ(Request.class), RESP(Response.class);

    private final JAXBContext jaxbContext;

    MyApplicationJAXBContext(Class contextClass) {

        try {
            jaxbContext = JAXBContext.newInstance(contextClass);
        } catch (JAXBException e) 
            throw new RunTimeException(e);
           // Lets caller decide what to do ?
        }
    }

    public JAXBContext getJaxbContext() {
        return jaxbContext;
    }
}


public class MyAppCallable implements Callable {

private final Request req;
public MyAppCallable(Request req) {
    this.req = req;
}


public Response call() {

Marshaller marshaller = MyApplicationJAXBContext.REQ.getJaxbContext().createMarshaller();
marshaller.setProperty(Marshaller.JAXB_FORMATTED_OUTPUT, true);
// Anything else you want to configure properties
Unmarshaller unmarshaller = MyApplicationJAXBContext.RESP.getJaxbContext().createUnmarshaller();

/** 
All other logic you want to do after req/rsp usage and return Response
**/

}

}