@JsonAnySetter mangles nested xml Elements and Attributes during serialization (original) (raw)

I apologize in advance if there is already a bug opened for this condition (or if I am approaching this the wrong way) - my search-fu failed to turn up anything similar.

I have a situation where I need deserialize XML to a POJO, and at the end of it all I need to serialize the request back to XML and return it as part of the response. I only need to process a portion the fields. I'd rather not map out all unused fields on the POJO, as this would require constantly updating the application as the end-user's generation of the request schema grows over time.

Describe the bug

I'm attempting to use @JsonAnySetter to capture the unmapped fields during deserialization, and @JsonAnyGetter to serialize them on the way back out.

It works fine for simple values (e.g. <some-unmapped-field>hello</some-unmapped-field>. But when the unmapped field includes attributes (.e.g. <some-unmapped-field id = "one">hello</some-unmapped-field> or nested XML elements (e.g. <some-unmapped-field><a>1</a><b>2</b></some-unmapped-field>, the serialized output becomes completely mangled.

Version information

com.fasterxml.jackson.core:jackson-annotations:2.13.3
com.fasterxml.jackson.dataformat:jackson-dataformat-xml:2.13.3

To Reproduce

The POJO:

@Getter @Setter public class SomePojo { @JsonProperty("id") String id;

 /// Other mapped fields/elements....

@JsonAnyGetter
@JsonAnySetter
@JsonUnwrapped
Map<String, Object> others = new HashMap<>();

}

The input XML:

The output XML:

1. Brief code sample/snippet: include here in preformatted/code section
2. Longer example stored somewhere else (diff repo, snippet), add a link
3. Textual explanation: include here

Expected behavior

I would expect the attributes/elements to be kept through the deserialization / serialization process.

Additional context

• I have tried other values for the underlying map, including String (output is empty) and com.fasterxml.jackson.databind.JsonNode (throws JsonMappingException).
• I've tried @JsonRawValue, but from what I've read that only affects serialization, and has no effect on deserialization. This has been consistent with my experiments.
• I've tried writing a custom deserializer, but the underlying JsonParser seems too-JSON oriented, ultimately requiring the input XML to cleanly map to JSON - my guess would be this is why I'm having this issue in the first place.

Thanks for looking!