#vulnerable code 
                              @Test
  public void verifyValidateClusterStartupWarnsIfNoServersInCluster() {
    WlsClusterConfig wlsClusterConfig = new WlsClusterConfig("cluster1");
    ClusterStartup cs = new ClusterStartup().withClusterName("cluster1").withReplicas(1);
    wlsClusterConfig.validateClusterStartup(cs, null);
    assertThat(logRecords, containsWarning(NO_WLS_SERVER_IN_CLUSTER, "cluster1"));
    assertThat(logRecords, containsWarning(REPLICA_MORE_THAN_WLS_SERVERS));
  } 
                            #location 5 
                            #vulnerability type NULL_DEREFERENCE
#fixed code
                              @Test
  public void verifyValidateClusterStartupWarnsIfNoServersInCluster() {
    WlsClusterConfig wlsClusterConfig = new WlsClusterConfig("cluster1");

    wlsClusterConfig.validateCluster(1, null);

    assertThat(logRecords, containsWarning(NO_WLS_SERVER_IN_CLUSTER, "cluster1"));
  }