JAXB marshaling Map of Lists
I have a map of lists that I need to marshal. I created XML adapater but I keep getting `java.util.List is an interface, and JAXB can't handle interfaces.` when creating JAXB context. How should I marshal map of lists? This is my code:

    @XmlRootElement(name = "myClass")
    public class MyClass  {
    
    	@XmlJavaTypeAdapter(MapOfListsAdapter.class)
    	protected Map<Integer, List<Condition>> expectedResults;

I have written adapter MapOfListsAdapater for the map:

    public class MapOfListsAdapter extends XmlAdapter<List<MapOfListsEntry>, Map<Integer, List<Condition>>> {
    
    	@Override
    	public List<MapOfListsEntry> marshal(Map<Integer, List<Condition>> v) {...}
    
    	@Override
    	public Map<Integer, List<Condition>> unmarshal(List<MapOfListsEntry> v) {...}
    }

MapOfListEntry has these JAXB annotations:

    public class MapOfListsEntry {
    
    	@XmlAttribute
    	private Integer key;
    
    	@XmlElementRef
    	@XmlElementWrapper
    	private List<Condition> value;



JAXB marshaling Map of Lists
===

I have a map of lists that I need to marshal. I created XML adapater but I keep getting `java.util.List is an interface, and JAXB can't handle interfaces.` when creating JAXB context. How should I marshal map of lists? This is my code:

    @XmlRootElement(name = "myClass")
    public class MyClass  {
    
    	@XmlJavaTypeAdapter(MapOfListsAdapter.class)
    	protected Map<Integer, List<Condition>> expectedResults;

I have written adapter MapOfListsAdapater for the map:

    public class MapOfListsAdapter extends XmlAdapter<List<MapOfListsEntry>, Map<Integer, List<Condition>>> {
    
    	@Override
    	public List<MapOfListsEntry> marshal(Map<Integer, List<Condition>> v) {...}
    
    	@Override
    	public Map<Integer, List<Condition>> unmarshal(List<MapOfListsEntry> v) {...}
    }

MapOfListEntry has these JAXB annotations:

    public class MapOfListsEntry {
    
    	@XmlAttribute
    	private Integer key;
    
    	@XmlElementRef
    	@XmlElementWrapper
    	private List<Condition> value;


