code: public Observable<Page<VirtualNetworkRuleInner>> listByAccountNextAsync(final String nextPageLink) {
          return listByAccountNextWithServiceResponseAsync(nextPageLink)
              .map(new Func1<ServiceResponse<Page<VirtualNetworkRuleInner>>, Page<VirtualNetworkRuleInner>>() {
                  @Override
                  public Page<VirtualNetworkRuleInner> call(ServiceResponse<Page<VirtualNetworkRuleInner>> response) {
                      return response.body();
                  }
              });
      }
docs: Lists the Data Lake Store virtual network rules within the specified Data Lake Store account.
  
  @param nextPageLink The NextLink from the previous successful call to List operation.
  @throws IllegalArgumentException thrown if parameters fail the validation
  @return the observable to the PagedList&lt;VirtualNetworkRuleInner&gt; object