output: #fixed code
                                 public static String toString(final InputStream stream)
     {
        StringBuilder out = new StringBuilder();
  
        try
        {
           final char[] buffer = new char[0x10000];
           Reader in = new InputStreamReader(stream, StandardCharsets.UTF_8);
           int read;
           do
           {
              read = in.read(buffer, 0, buffer.length);
              if (read > 0)
              {
                 out.append(buffer, 0, read);
              }
           }
           while (read >= 0);
        }
        catch (IOException e)
        {
           throw new RuntimeException(e);
        }
        return out.toString();
     }
input: #vulnerable code 
                                 public static String toString(final InputStream stream)
     {
        StringBuilder out = new StringBuilder();
        try
        {
           final char[] buffer = new char[0x10000];
           Reader in = new InputStreamReader(stream, "UTF-8");
           int read;
           do
           {
              read = in.read(buffer, 0, buffer.length);
              if (read > 0)
              {
                 out.append(buffer, 0, read);
              }
           }
           while (read >= 0);
        }
        catch (UnsupportedEncodingException e)
        {
           throw new RuntimeException(e);
        }
        catch (IOException e)
        {
           throw new RuntimeException(e);
        }
        return out.toString();
     } 
                              #location 27 
                              #vulnerability type RESOURCE_LEAK