JAX-WS: How to make a SOAP Response return a HashMap object

Question

So I have a simple web service:

    @WebMethod(operationName=\"getBookList\")
    public HashMap getBookList()
    {
        HashMap

        

Answer 1

In order to help JAXB, you can 'wrap' your HashMap in a class and use the @XmlJavaTypeAdapter to make your custom serialization of the map to XML.

public class Response {

    @XmlJavaTypeAdapter(MapAdapter.class)    
    HashMap books;

    public HashMap getBooks() {
        return mapProperty;
    }

    public void setBooks(HashMap map) {
        this.mapProperty = map;
    }

}

Then use this class as a return value of your WebMethod

@WebMethod(operationName="getBookList")
    public Response getBookList()
    {
         HashMap books = new HashMap();
         Book b1 = new Book(1,"title1");
         Book b2 = new Book(2, "title2");
         books.put(1, b1);
         books.put(2, b2);
         Response resp = new Response();
         resp.setBooks(books);
         return resp;
    }

After all, you need to implement your adapter MapAdapter. There is several ways to do this, so I recommend you to check this