Classcast exceptins during iterative development

Question

using Eclipse 3.4.2 and latest eclipselink
When doing a clean build and start the appserver, everything works fine.
Whenever , we do incremental builds and publish the application, we are getting ClassCast Exceptions in persistance classes.
is there any issue with iterative development and using eclipse link?

Answer 1

I am getting a ClassCastExcetion at the highlighted line whenever I do a incremental build and publish to the server
When the server is restarted after compilation , it works fine
public Map getCountries(){
          EntityManagerFactory emf = ExidePersistentFactory.getInstance();
          EntityManager em= emf.createEntityManager();
          List<Country> countries = em.createNamedQuery("getCountries").getResultList();
          Map countryMap = new HashMap();
          for(Iterator<Country> i= countries.iterator();i.hasNext();){
               Country ct = i.next();
               countryMap.put(ct.getCountryId(),ct.getCountryName());
          em.close();
          return countryMap;
     }