code: @Override
      public Map<Object, Object> getSwappableData() {
          if (mSwappableData == null) {
              mSwappableData = new ConcurrentHashMap<Object, Object>();
              if (isNew()) {
                  //if this is a new session, then we have the updated app data
                  populatedAppData = true;
              }
          }
          return mSwappableData;
      }
docs: This method is copied from DatabaseSession.getSwappableData.
  
  @see com.ibm.ws.session.store.common.BackedSession#getSwappableData()