JAXB: how to marshall map into value

MapElements :

package com.cellfish.mediadb.rest.lucene; import javax.xml.bind.annotation.XmlElement; class MapElements { @XmlElement public String key; @XmlElement public Integer value; private MapElements() {} //Required by JAXB public MapElements(String key, Integer value) { this.key = key; this.value = value; } }

MapAdapter :

import java.util.HashMap; import java.util.Map; import javax.xml.bind.annotation.adapters.XmlAdapter; class MapAdapter extends XmlAdapter<MapElements[], Map<String, Integer>> { public MapElements[] marshal(Map<String, Integer> arg0) throws Exception { MapElements[] mapElements = new MapElements[arg0.size()]; int i = 0; for (Map.Entry<String, Integer> entry : arg0.entrySet()) mapElements[i++] = new MapElements(entry.getKey(), entry.getValue()); return mapElements; } public Map<String, Integer> unmarshal(MapElements[] arg0) throws Exception { Map<String, Integer> r = new HashMap<String, Integer>(); for (MapElements mapelement : arg0) r.put(mapelement.key, mapelement.value); return r; } }

The rootElement :

import java.util.HashMap; import java.util.Map; import javax.xml.bind.annotation.XmlRootElement; import javax.xml.bind.annotation.adapters.XmlJavaTypeAdapter; @XmlRootElement public class Root { private Map<String, Integer> mapProperty; public Root() { mapProperty = new HashMap<String, Integer>(); } @XmlJavaTypeAdapter(MapAdapter.class) public Map<String, Integer> getMapProperty() { return mapProperty; } public void setMapProperty(Map<String, Integer> map) { this.mapProperty = map; } }

I found the code in this website : http://www.developpez.net/forums/d972324/java/general-java/xml/hashmap-jaxb/