#vulnerable code 
                              @Test
  public void testNamespaceWatch() {
    Assume.assumeTrue(System.getProperty("os.name").toLowerCase().contains("nix"));

    ClientHolder client = ClientHelper.getInstance().take();
    try {

      Watch<V1Namespace> watch = Watch.createWatch(
          client.getApiClient(),
          client.getCoreApiClient().listNamespaceCall(null,
              null,
              null,
              null,
              null,
              5,
              null,
              60,
              Boolean.TRUE,
              null,
              null),
          new TypeToken<Watch.Response<V1Namespace>>() {
          }.getType());


      for (Watch.Response<V1Namespace> item : watch) {
        System.out.printf("%s : %s%n", item.type, item.object.getMetadata().getName());
      }

    } catch (ApiException e) {
      fail();
    } catch (RuntimeException e) {
      System.out.println("stream finished");
    }

  } 
                            #location 3 
                            #vulnerability type NULL_DEREFERENCE
#fixed code
                              @Test
  public void testNamespaceWatch() throws Exception {
    Assume.assumeTrue(TestUtils.isKubernetesAvailable());

    ClientHolder client = ClientHelper.getInstance().take();

      Watch<V1Namespace> watch = Watch.createWatch(
          client.getApiClient(),
          client.getCoreApiClient().listNamespaceCall(null,
              null,
              null,
              null,
              null,
              5,
              null,
              60,
              Boolean.TRUE,
              null,
              null),
          new TypeToken<Watch.Response<V1Namespace>>() {
          }.getType());

  }