output: #fixed code
                                  protected ConfigurationSource getInputFromString(final String config, final ClassLoader loader) {
          try {
              final URL url = new URL(config);
              return new ConfigurationSource(url.openStream(), FileUtils.fileFromUri(url.toURI()));
          } catch (final Exception ex) {
              final ConfigurationSource source = getInputFromResource(config, loader);
              if (source == null) {
                  try {
                      final File file = new File(config);
                      return new ConfigurationSource(new FileInputStream(file), file);
                  } catch (final FileNotFoundException fnfe) {
                      // Ignore the exception
                      LOGGER.catching(Level.DEBUG, fnfe);
                  }
              }
              return source;
          }
      }
input: #vulnerable code 
                                  protected ConfigurationSource getInputFromString(final String config, final ClassLoader loader) {
          try {
              final URL url = new URL(config);
              return new ConfigurationSource(url.openStream(), FileUtils.fileFromURI(url.toURI()));
          } catch (final Exception ex) {
              final ConfigurationSource source = getInputFromResource(config, loader);
              if (source == null) {
                  try {
                      final File file = new File(config);
                      return new ConfigurationSource(new FileInputStream(file), file);
                  } catch (final FileNotFoundException fnfe) {
                      // Ignore the exception
                      LOGGER.catching(Level.DEBUG, fnfe);
                  }
              }
              return source;
          }
      } 
                              #location 4 
                              #vulnerability type NULL_DEREFERENCE