code: @Nullable
    public static IJson readFromStream (@Nonnull final IHasInputStream aISP,
                                        @Nonnull final Charset aFallbackCharset,
                                        @Nullable final IJsonParseExceptionCallback aCustomExceptionHandler)
    {
      ValueEnforcer.notNull (aISP, "InputStreamProvider");
      final InputStream aIS = aISP.getInputStream ();
      if (aIS == null)
        return null;
      return readFromStream (aIS, aFallbackCharset, aCustomExceptionHandler);
    }
docs: Read the Json from the passed {@link IHasInputStream}.
  
  @param aISP
  The input stream to use. May not be <code>null</code>.
  @param aFallbackCharset
  The charset to be used in case no BOM is present. May not be
  <code>null</code>.
  @param aCustomExceptionHandler
  An optional custom exception handler that can be used to collect the
  unrecoverable parsing errors. May be <code>null</code>.
  @return <code>null</code> if reading failed, the Json declarations
  otherwise.