java - Hashmap is empty on GWT async callback -

server side, construct java.util.hashmap, populate values (key , value both string) , pass client via async callback. empty when gets client side.

i can replicate net new hashmap used in 1 place server side. java 6 , gwt 2.7

server side service:

public class service extends remoteserviceservlet implements iservice {      public model buildmodel() {      model model = new model();      model.additemtomymap("key", "value");      return model;     } } 

model:

 public class model implements serializable {              private map<string, string> mymap = new hashmap<string, string>();              public void additemtomymap(string key, string value) {               if(key != null) {                  mymap.put(key, value);              }             }             public map<string, string> getmymap() {                 return mymap;             }        } 

async interface:

public interface iserviceasync {   public void buildmodel(asynccallback<model> callback); { } 

client side:

    service.buildmodel(new asynccallback<model>() {        public void onsuccess(model model) {         logger.warning(model.getmymap().size());     }       public void onfailure(throwable caught) {        logger.warning("error!");     }  }  

problem solved. eclipse save actions making map final , preventing serialization. when removed final modifier (and prevented eclipse adding back), able see map's contents on client side.