output: #fixed code
                                private ClassLoader getDriverClassLoader() {
      File localDriverPath = getCustomDriverPath();
      if (driverClassLoader != null) {
        return driverClassLoader;
      } else if (localDriverPath.exists()) {
        try {
          List<URL> urlList = new ArrayList<>();
          File[] files = localDriverPath.listFiles();
          if (files != null) {
            for (File file : files) {
              String filename = file.getCanonicalPath();
              if (!filename.startsWith("/")) {
                filename = "/" + filename;
              }
              urlList.add(new URL("jar:file:" + filename + "!/"));
              urlList.add(new URL("file:" + filename));
            }
          }
          URL[] urls = urlList.toArray(new URL[0]);
          return new URLClassLoader(urls);
        } catch (Exception e) {
          throw new MigrationException("Error creating a driver ClassLoader. Cause: " + e, e);
        }
      }
      return null;
    }
input: #vulnerable code 
                                private ClassLoader getDriverClassLoader() {
      File localDriverPath = getCustomDriverPath();
      if (driverClassLoader != null) {
        return driverClassLoader;
      } else if (localDriverPath.exists()) {
        try {
          List<URL> urlList = new ArrayList<URL>();
          for (File file : localDriverPath.listFiles()) {
            String filename = file.getCanonicalPath();
            if (!filename.startsWith("/")) {
              filename = "/" + filename;
            }
            urlList.add(new URL("jar:file:" + filename + "!/"));
            urlList.add(new URL("file:" + filename));
          }
          URL[] urls = urlList.toArray(new URL[urlList.size()]);
          return new URLClassLoader(urls);
        } catch (Exception e) {
          throw new MigrationException("Error creating a driver ClassLoader. Cause: " + e, e);
        }
      }
      return null;
    } 
                              #location 8 
                              #vulnerability type NULL_DEREFERENCE