Spring Fix error message in SynchronossPartHttpMessageReader

Hi @snicoll,

I have the configuration below:

    @Bean
    CodecCustomizer multiPartCodecCustomizer() {
        return configurer -> {
            SynchronossPartHttpMessageReader partReader = new SynchronossPartHttpMessageReader();
            partReader.setMaxParts(5);

            configurer.customCodecs().register(partReader);
            MultipartHttpMessageReader multipartHttpMessageReader = new MultipartHttpMessageReader(partReader);
            configurer.customCodecs().register(multipartHttpMessageReader);
        };
    }

When:

curl --location --request POST 'http://localhost:8080/api/v1/test/bulk' \
--header 'Content-Type: multipart/form-data' \
--form 'files=@"/C:/Users/test/payload.csv"' \
--form 'files=@"/C:/Users/test/payload(1).csv"' \
--form 'files=@"/C:/Users/test/payload(2).csv"' \
--form 'files=@"/C:/Users/test/payload(3).csv"' \
--form 'files=@"/C:/Users/test/payload(4).csv"' \
--form 'files=@"/C:/Users/test/payload(5).csv"' \

Actual:

{
    "timestamp": "2021-07-27T09:39:55.438+00:00",
    "path": "/api/v1/test/bulk",
    "status": 400,
    "error": "Bad Request",
    "message": "Failure while parsing part[6]; nested exception is org.springframework.core.codec.DecodingException: Too many parts (6 allowed)",
    "requestId": "17ee076c-1"
}

Expected:

{
    "timestamp": "2021-07-27T09:39:55.438+00:00",
    "path": "/api/v1/test/bulk",
    "status": 400,
    "error": "Bad Request",
    "message": "Failure while parsing part[6]; nested exception is org.springframework.core.codec.DecodingException: Too many parts (6/5 allowed)",
    "requestId": "17ee076c-1"
}

I checked DefaultMultipartMessageReader which seems to be correct. Unfortunately, I'm using an old version of Spring Boot 2.3.x and I couldn't upgrade.

Thanks

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