code: public String getDefaultListName() throws NoResponseException, XMPPErrorException, NotConnectedException, InterruptedException {
          if (cachedDefaultListName != null) {
              return cachedDefaultListName;
          }
          return getPrivacyWithListNames().getDefaultName();
      }
docs: Get the name of the default list.
  
  @return the name of the default list or null if there is none set.
  @throws NoResponseException
  @throws XMPPErrorException
  @throws NotConnectedException
  @throws InterruptedException
  @since 4.1