output: #fixed code
                                  public static void toLibSVM(List<TrainingElement<BxZoneLabel>> trainingElements, String filePath) throws IOException {
      	BufferedWriter svmDataFile = null;
          try {
              FileWriter fstream = new FileWriter(filePath);
              svmDataFile = new BufferedWriter(fstream);
              for (TrainingElement<BxZoneLabel> elem : trainingElements) {
                  svmDataFile.write(String.valueOf(elem.getLabel().ordinal()));
                  svmDataFile.write(" ");
  
                  Integer featureCounter = 1;
                  for (Double value : elem.getObservation().getFeatures()) {
                      StringBuilder sb = new StringBuilder();
                      Formatter formatter = new Formatter(sb, Locale.US);
                      formatter.format("%d:%.5f", featureCounter++, value);
                      svmDataFile.write(sb.toString());
                      svmDataFile.write(" ");
                  }
                  svmDataFile.write("\n");
              }
              svmDataFile.close();
          } catch (Exception e) {
              System.err.println("Error: " + e.getMessage());
              return;
          } finally {
          	if(svmDataFile != null) {
          		svmDataFile.close();
          	}
          }
          
          System.out.println("Done.");
      }
input: #vulnerable code 
                                  public static void toLibSVM(List<TrainingElement<BxZoneLabel>> trainingElements, String filePath) {
          try {
              FileWriter fstream = new FileWriter(filePath);
              BufferedWriter svmDataFile = new BufferedWriter(fstream);
              for (TrainingElement<BxZoneLabel> elem : trainingElements) {
                  svmDataFile.write(String.valueOf(elem.getLabel().ordinal()));
                  svmDataFile.write(" ");
  
                  Integer featureCounter = 1;
                  for (Double value : elem.getObservation().getFeatures()) {
                      StringBuilder sb = new StringBuilder();
                      Formatter formatter = new Formatter(sb, Locale.US);
                      formatter.format("%d:%.5f", featureCounter++, value);
                      svmDataFile.write(sb.toString());
                      svmDataFile.write(" ");
                  }
                  svmDataFile.write("\n");
              }
              svmDataFile.close();
          } catch (Exception e) {
              System.err.println("Error: " + e.getMessage());
              return;
          }
          System.out.println("Done.");
      } 
                              #location 20 
                              #vulnerability type RESOURCE_LEAK