output: #fixed code
                               public static Instances createBootstrapSample(Instances instances) {
  		Random rand = Random.getInstance();
  		Map<Integer, Integer> map = new HashMap<>();
  		for (int i = 0; i < instances.size(); i++) {
  			int idx = rand.nextInt(instances.size());
  			map.put(idx, map.getOrDefault(idx, 0) + 1);
  		}
  		Instances bag = new Instances(instances.getAttributes(), instances.getTargetAttribute(), map.size());
  		for (Integer idx : map.keySet()) {
  			int weight = map.get(idx);
  			Instance instance = instances.get(idx).clone();
  			instance.setWeight(weight);
  			bag.add(instance);
  		}
  		return bag;
  	}
input: #vulnerable code 
                               public static Instances createBootstrapSample(Instances instances) {
  		Random rand = Random.getInstance();
  		Map<Integer, Integer> map = new HashMap<>();
  		for (int i = 0; i < instances.size(); i++) {
  			int idx = rand.nextInt(instances.size());
  			if (!map.containsKey(idx)) {
  				map.put(idx, 0);
  			}
  			map.put(idx, map.get(idx) + 1);
  		}
  		Instances bag = new Instances(instances.getAttributes(), instances.getTargetAttribute(), map.size());
  		for (Integer idx : map.keySet()) {
  			int weight = map.get(idx);
  			Instance instance = instances.get(idx).clone();
  			instance.setWeight(weight);
  			bag.add(instance);
  		}
  		return bag;
  	} 
                              #location 9 
                              #vulnerability type NULL_DEREFERENCE