Jackson XML Serialization - Remove Field Tags

I need to generate this XML:

<CRequest>
  <abc:Name>Smith</abc:Name>
  <abc:FirstName>John</abc:Surname>
  <abc:Age>12</abc:Age>
  <abc:Name>Jones</abc:Name>
  <abc:FirstName>Jake</abc:Surname>
  <abc:Age>10</abc:Age>
  <abc:Name>Johnson</abc:Name>
  <abc:FirstName>Paul</abc:Surname>
  <abc:Age>12</abc:Age>
</CRequest>

However, the best I could do was:

<CRequest>
  <children>
    <abc:Name>Smith</abc:Name>
    <abc:FirstName>John</abc:Surname>
    <abc:Age>12</abc:Age>
  </children>
  <children>
    <abc:Name>Jones</abc:Name>
    <abc:FirstName>Jake</abc:Surname>
    <abc:Age>12</abc:Age>
  </children>
  <children>
    <abc:Name>Johnson</abc:Name>
    <abc:FirstName>Paul</abc:Surname>
    <abc:Age>12</abc:Age>
  </children>
</CRequest>

I have the following Java classes:

@JsonRootName("CRequest")
@XmlAccessorType(XmlAccessType.FIELD)
@JsonInclude(JsonInclude.Include.NON_EMPTY)
public class ChildrenRequest {

    @JacksonXmlElementWrapper(useWrapping = false)
    private List<Child> children= new ArrayList<>();
    ...

and

@XmlAccessorType(XmlAccessType.FIELD)
@JsonInclude(JsonInclude.Include.NON_EMPTY)
@JsonPropertyOrder({"Name", "FirstName", "Age"})
public class Child{

    @JsonProperty("Name")
    @JacksonXmlProperty(localName = "abc:Name")
    private String name;

    @JsonProperty("Surname")
    @JacksonXmlProperty(localName = "FirstName")
    private String firstName;

    @JsonProperty("Age")
    @JacksonXmlProperty(localName = "abc:Age")
    private String age;
    ...

Is there a way to get rid of the children tags?

PS: Without "useWrapping = false" I get two children tags for every child.

You need to implement custom serialiser for request class:

class ChildrenRequestJsonSerializer extends JsonSerializer<ChildrenRequest> {
	@Override
	public void serialize(ChildrenRequest value, JsonGenerator gen, SerializerProvider serializers) throws IOException {
		ToXmlGenerator xmlGen = (ToXmlGenerator) gen;
		writeStartObject(xmlGen);
		JsonSerializer<Object> childSerializer = serializers.findValueSerializer(Child.class).unwrappingSerializer(NameTransformer.NOP);
		for (Child child : value.getChildren()) {
			childSerializer.serialize(child, gen, serializers);
		}
		xmlGen.writeEndObject();
	}

	private void writeStartObject(ToXmlGenerator xmlGen) throws IOException {
		final XmlMapper mapper = (XmlMapper) xmlGen.getCodec();
		final PropertyName rootName = mapper.getSerializationConfig().findRootName(ChildrenRequest.class);

		xmlGen.setNextName(new QName("", rootName.getSimpleName()));
		xmlGen.writeStartObject();
	}
}

And you can register serialiser as below:

@JsonRootName("CRequest")
@JsonSerialize(using = ChildrenRequestJsonSerializer.class)
class ChildrenRequest

See also:

• @JsonSerialize - How to create a wrapper at runtime and use default serialization for the object fields?
• Dynamic root element with Jackson
• JacksonXmlRootElement with dynamic localName value