output: #fixed code
                                  @Override
      public AnalysisResult run() throws Exception {
          long startMs = System.currentTimeMillis();
          DataIngester ingester = conf.constructIngester();
          List<Datum> data = ingester.getStream().drain();
          long loadEndMs = System.currentTimeMillis();
  
          MBStream<OutlierClassificationResult> ocrs =
                  MBOperatorChain.begin(data)
                               .then(new EWFeatureTransform(conf))
                               .then(new EWAppxPercentileOutlierClassifier(conf)).executeMiniBatchUntilFixpoint(1000);
  
          Summarizer summarizer = new EWStreamingSummarizer(conf);
          summarizer.consume(ocrs.drain());
  
          Summary result = summarizer.getStream().drain().get(0);
  
          final long endMs = System.currentTimeMillis();
          final long loadMs = loadEndMs - startMs;
          final long totalMs = endMs - loadEndMs;
          final long summarizeMs = result.getCreationTimeMs();
          final long executeMs = totalMs - result.getCreationTimeMs();
  
          log.info("took {}ms ({} tuples/sec)",
                   totalMs,
                   (result.getNumInliers()+result.getNumOutliers())/(double)totalMs*1000);
  
          return new AnalysisResult(result.getNumOutliers(),
                                    result.getNumInliers(),
                                    loadMs,
                                    executeMs,
                                    summarizeMs,
                                    result.getItemsets());
      }
input: #vulnerable code 
                                  @Override
      public AnalysisResult run() throws Exception {
          long startMs = System.currentTimeMillis();
          DataIngester ingester = conf.constructIngester();
          List<Datum> data = ingester.getStream().drain();
          long loadEndMs = System.currentTimeMillis();
  
          FeatureTransform featureTransform = new EWFeatureTransform(conf);
          featureTransform.consume(ingester.getStream().drain());
  
          OutlierClassifier outlierClassifier = new EWAppxPercentileOutlierClassifier(conf);
          outlierClassifier.consume(featureTransform.getStream().drain());
  
          Summarizer summarizer = new EWStreamingSummarizer(conf);
          summarizer.consume(outlierClassifier.getStream().drain());
  
          Summary result = summarizer.getStream().drain().get(0);
  
          final long endMs = System.currentTimeMillis();
          final long loadMs = loadEndMs - startMs;
          final long totalMs = endMs - loadEndMs;
          final long summarizeMs = result.getCreationTimeMs();
          final long executeMs = totalMs - result.getCreationTimeMs();
  
          log.info("took {}ms ({} tuples/sec)",
                   totalMs,
                   (result.getNumInliers()+result.getNumOutliers())/(double)totalMs*1000);
  
          return new AnalysisResult(result.getNumOutliers(),
                                    result.getNumInliers(),
                                    loadMs,
                                    executeMs,
                                    summarizeMs,
                                    result.getItemsets());
      } 
                              #location 12 
                              #vulnerability type NULL_DEREFERENCE