Exception when serializing with type via mapper.writerFor(type).write(...)

[texhnolyzze]

Hello again!
We have problems with Jackson (2.97) again (not JSON, but XML). Please, tell me what am I doing wrong. Here is the simple code:

@JsonTypeInfo(use = JsonTypeInfo.Id.NAME, property = "type")
@JsonSubTypes({
    @JsonSubTypes.Type(value = ConcreteModel.class, name = "ConcreteModel")
})
public abstract class AbstractModel {
    
	@JacksonXmlProperty(isAttribute = true)
	public Long id;
	
	@JacksonXmlProperty(isAttribute = true)
	public String name;

}

@JacksonXmlRootElement(localName = "Concrete")
public class ConcreteModel extends AbstractModel {

	@JacksonXmlProperty(isAttribute = true)
	public String someAdditionalField;

}

I ommitted getters/setters.
Okay, now I'm doing such simple thing:

ConcreteModel concreteModel = new ConcreteModel();
concreteModel.id = 1L;
concreteModel.name = "Bob";
concreteModel.someAdditionalField = "...";
XmlMapper xmlMapper = getXmlMapper();
System.out.println(xmlMapper.writeValueAsString(concreteModel));

And it outputs:

<Concrete type="ConcreteModel" id="1" name="Bob" someAdditionalField="..."/>

Great!
Now I replaced the last line to:

System.out.println(xmlMapper.writerFor(xmlMapper.constructType(concreteModel.getClass())).writeValueAsString(concreteModel));

And I'm getting the error:

com.fasterxml.jackson.databind.JsonMappingException: No element/attribute name specified when trying to output element
	Suppressed: com.fasterxml.jackson.core.JsonGenerationException: Trying to write END_DOCUMENT when document has no root (ie. trying to output empty document).
		at com.fasterxml.jackson.dataformat.xml.util.StaxUtil.throwAsGenerationException(StaxUtil.java:47)
		at com.fasterxml.jackson.dataformat.xml.ser.ToXmlGenerator.close(ToXmlGenerator.java:1188)
		at com.fasterxml.jackson.databind.util.ClassUtil.closeOnFailAndThrowAsIOE(ClassUtil.java:488)
		at com.fasterxml.jackson.databind.ObjectWriter._configAndWriteValue(ObjectWriter.java:1122)
		... 32 more
	Caused by: javax.xml.stream.XMLStreamException: Trying to write END_DOCUMENT when document has no root (ie. trying to output empty document).
		at com.ctc.wstx.sw.BaseStreamWriter.throwOutputError(BaseStreamWriter.java:1584)
		at com.ctc.wstx.sw.BaseStreamWriter.reportNwfStructure(BaseStreamWriter.java:1613)
		at com.ctc.wstx.sw.BaseStreamWriter._finishDocument(BaseStreamWriter.java:1439)
		at com.ctc.wstx.sw.BaseStreamWriter.closeCompletely(BaseStreamWriter.java:921)
		at com.fasterxml.jackson.dataformat.xml.ser.ToXmlGenerator.close(ToXmlGenerator.java:1183)
		... 34 more
Caused by: java.lang.IllegalStateException: No element/attribute name specified when trying to output element
	at com.fasterxml.jackson.dataformat.xml.ser.ToXmlGenerator.handleMissingName(ToXmlGenerator.java:1218)
	at com.fasterxml.jackson.dataformat.xml.ser.ToXmlGenerator._handleStartObject(ToXmlGenerator.java:533)
	at com.fasterxml.jackson.dataformat.xml.ser.ToXmlGenerator.writeStartObject(ToXmlGenerator.java:509)
	at com.fasterxml.jackson.core.base.GeneratorBase.writeStartObject(GeneratorBase.java:286)
	at com.fasterxml.jackson.core.JsonGenerator.writeTypePrefix(JsonGenerator.java:1459)
	at com.fasterxml.jackson.databind.jsontype.impl.TypeSerializerBase.writeTypePrefix(TypeSerializerBase.java:46)
	at com.fasterxml.jackson.databind.ser.std.BeanSerializerBase.serializeWithType(BeanSerializerBase.java:600)
	at com.fasterxml.jackson.dataformat.xml.ser.XmlBeanSerializerBase.serializeWithType(XmlBeanSerializerBase.java:320)
	at com.fasterxml.jackson.databind.ser.DefaultSerializerProvider.serializePolymorphic(DefaultSerializerProvider.java:452)
	... 34 more

Can you please tell me what is wrong?

[cowtowncoder]

Hoping to look into this in near future; haven't had time yet unfortunately.

[cowtowncoder]

Ok, I can reproduce this with 2.11. Very odd. Usage looks good and I am not sure why one would work other not... Will need to check deeper.

[cowtowncoder]

Looks like XML module was missing 2 overrides for DefaultSerializerProvider, added for 2.11 branch, will be included in 2.11.1.