public static <T> void mergeFrom(Reader reader, T message, Schema<T> schema,
            boolean numeric) throws IOException
    {
        final JsonParser parser = DEFAULT_JSON_FACTORY.createJsonParser(reader);
        try
        {
            mergeFrom(parser, message, schema, numeric);
        }
        finally
        {
            parser.close();
        }
    }
Merges the {@code message} from the {@link Reader} using the given {@code schema}.
protostuff-json/src/main/java/io/protostuff/JsonIOUtil.java