Summary of changes follows:
- Delegate ALL requestBody encoding where Content-Type is multipart/form-data to the SpringFormEncoder.
- Introduce RequestPartParameterProcessor to deal with @RequestPart annotations, adds parameters to MethodMetadata.formParams().
- Wrap HttpMessageConversionException in EncodeException.
- Add tests to verify expected behaviour.
However there still exists a gap in functionality where any user defined pojo will be serialized as a Map<String,String>, as there is currently no way for SpringFormEncoder to know about the Content-Type of the individual parts beyond MultipartFile, boxed primitive types (which are treated as text/plain) and other built-in types inherited from FormEncoder.
892e65e303