You could start with a generic DAO pattern that is just a thin wrapper around 
an entity manager, something like the following:


  | public interface GenericDao
  | {
  |   public <T extends BaseEntity> void save (T entity);
  | 
  |   public <T extends BaseEntity> void delete (T entity);
  |   
  |   public <T extends BaseEntity> void delete (Class<T> clazz, Serializable 
id) ;
  | 
  |   public <T extends BaseEntity> T find (Class<T> clazz, Serializable id) ;
  | 
  |   public <T extends BaseEntity> List<T> list (Class<T> clazz) ;
  | 
  |   public <T extends BaseEntity> T findByExample (T example);
  | 
  |   public <T extends BaseEntity> List<T> listByExample (T example);
  | }
  | 

Then you'd still have the option to switch your persistence layer should the 
need arise.

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