code: public String get(String keyStr) {
          String result = null;
          try {
              DatabaseEntry key = new DatabaseEntry(keyStr.getBytes("UTF-8"));
              DatabaseEntry data = new DatabaseEntry();
              if (db.get(null, key, data, LockMode.DEFAULT) == 
              	OperationStatus.SUCCESS) {
              	
                  byte[] bytes = data.getData();
                  result = new String(bytes, "UTF-8");
              }
           } catch (DatabaseException e) {
               e.printStackTrace();
           } catch (UnsupportedEncodingException e) {
              e.printStackTrace();
          }
          return result;
      }
docs: retrieve the value assoicated with keyStr from persistant storage
  @param keyStr
  @return String value associated with key, or null if no key is found
  or an error occurs