output: #fixed code
                                  @Test
      public void benchmark() throws InterruptedException {
          Benchmark bench = new Benchmark();
          
          // Hipster-Dijkstra
          bench.add("Hipster-Dijkstra", new Algorithm() {	
  			AStar<Point> it; Maze2D maze;
          	public void initialize(Maze2D maze) {
  				it= AlgorithmIteratorFromMazeCreator.astar(maze, false);
  				this.maze = maze;
  			}
  			public Result evaluate() {
  				return MazeSearch.executeIteratorSearch(it, maze);
  			}
  		});
          
          // JUNG-Dijkstra
          bench.add("JUNG-Dijkstra", new Algorithm() {
  			Maze2D maze;DirectedGraph<Point, JungEdge<Point>> graph;
  			public void initialize(Maze2D maze) {
  				this.maze = maze;
  				this.graph = JungDirectedGraphFromMazeCreator.create(maze);
  			}
  			public Result evaluate() {
  				return MazeSearch.executeJungSearch(graph, maze);
  			}
  		});
  
          int index = 0;
          for(String algName : bench.algorithms.keySet()){
          	System.out.println((++index) + " = " + algName);
          }
          
          for (int i = 10; i < 300; i += 10) {
          	Maze2D maze = Maze2D.empty(i);
              // Test over an empty maze
              Map<String, Benchmark.Score> results = bench.run(maze);
              // Check results and print scores. We take JUNG as baseline
              Benchmark.Score jungScore = results.get("JUNG-Dijkstra");
              String scores = "";
              for(String algName : bench.algorithms.keySet()){
              	Benchmark.Score score = results.get(algName);
              	assertEquals(jungScore.result.getCost(),score.result.getCost(), 0.0001);
              	scores += score.time + " ms\t";
              }
              System.out.println(scores);
          }
      }
input: #vulnerable code 
                                  @Test
      public void benchmark() throws InterruptedException {
          System.out.println("Maze | Hipster-Dijkstra (ms) | JUNG-Dijkstra (ms)");
          System.out.println("-------------------------------------------------");
          final int times = 5;
          for (int i = 10; i < 300; i += 10) {
              Maze2D maze = Maze2D.random(i, 0.9);
              // Repeat 5 times
              //Double mean1 = 0d, mean2 = 0d;
              double min2 = Double.MAX_VALUE, min1 = Double.MAX_VALUE;
              DirectedGraph<Point, JungEdge<Point>> graph = JungDirectedGraphFromMazeCreator.create(maze);
              for (int j = 0; j < times; j++) {
                  //AStar<Point> it = AStarIteratorFromMazeCreator.create(maze, false);
                  AStar<Point> it = AlgorithmIteratorFromMazeCreator.astar(maze, false);
                  Stopwatch w1 = new Stopwatch().start();
                  MazeSearch.Result resultJung = MazeSearch.executeJungSearch(graph, maze);
                  //In case there is no possible result in the random maze
                  if(resultJung.equals(MazeSearch.Result.NO_RESULT)){
                      maze = Maze2D.random(i, 0.9);
                      graph = JungDirectedGraphFromMazeCreator.create(maze);
                      j--;
                      continue;
                  }
                  long result1 = w1.stop().elapsed(TimeUnit.MILLISECONDS);
                  if (result1 < min1) {
                      min1 = result1;
                  }
                  Stopwatch w2 = new Stopwatch().start();
                  MazeSearch.Result resultIterator = MazeSearch.executeIteratorSearch(it, maze);
                  long result2 = w2.stop().elapsed(TimeUnit.MILLISECONDS);
                  if (result2 < min2) {
                      min2 = result2;
                  }
                  assertEquals(resultIterator.getCost(), resultJung.getCost(), 0.001);
              }
              System.out.println(String.format("%d \t\t %.5g \t\t %.5g", i, min2, min1));
          }
      } 
                              #location 34 
                              #vulnerability type NULL_DEREFERENCE