XmlMapper does not find no-argument record constructor for deserialization of empty XML

[MichalStehlikCz]

Replicated with Jackson 2.13.3

Might be related to #508

Unlike XmlMapper is not able to find no-argument record constructor for deserialization of emptzy document even if one is explicitly defined

public class NoArgumentConstructorTest {

  public record TestRecord(@Nullable String a) {

    public TestRecord() {
      this(null);
    }
  }

  @Test
  void testNoArgumentConstructorXml() throws JsonProcessingException {
    var xmlMapper = new XmlMapper();
    assertThat(xmlMapper.readerFor(TestRecord.class).readValue("<TEST/>"))
        .isNotNull();
  }
}

com.fasterxml.jackson.databind.exc.MismatchedInputException: Cannot construct instance of `com.provys.serverapi.restapi.obj.api.NoArgumentConstructorTest$TestRecord` (although at least one Creator exists): no default no-arguments constructor found
 at [Source: (StringReader); line: 1, column: 1]

	at com.fasterxml.jackson.databind.exc.MismatchedInputException.from(MismatchedInputException.java:63)
	at com.fasterxml.jackson.databind.DeserializationContext.reportInputMismatch(DeserializationContext.java:1728)
	at com.fasterxml.jackson.databind.DeserializationContext.handleMissingInstantiator(DeserializationContext.java:1353)
	at com.fasterxml.jackson.databind.deser.ValueInstantiator.createUsingDefault(ValueInstantiator.java:248)
	at com.fasterxml.jackson.databind.deser.std.StdValueInstantiator.createUsingDefault(StdValueInstantiator.java:275)
	at com.fasterxml.jackson.databind.deser.BeanDeserializerBase.getEmptyValue(BeanDeserializerBase.java:1042)
	at com.fasterxml.jackson.databind.deser.std.StdDeserializer._deserializeFromEmptyString(StdDeserializer.java:322)
	at com.fasterxml.jackson.databind.deser.std.StdDeserializer._deserializeFromString(StdDeserializer.java:270)
	at com.fasterxml.jackson.databind.deser.BeanDeserializerBase.deserializeFromString(BeanDeserializerBase.java:1495)
	at com.fasterxml.jackson.databind.deser.BeanDeserializer._deserializeOther(BeanDeserializer.java:196)
	at com.fasterxml.jackson.databind.deser.BeanDeserializer.deserialize(BeanDeserializer.java:186)
	at com.fasterxml.jackson.dataformat.xml.deser.XmlDeserializationContext.readRootValue(XmlDeserializationContext.java:91)
	at com.fasterxml.jackson.databind.ObjectReader._bindAndClose(ObjectReader.java:2051)
	at com.fasterxml.jackson.databind.ObjectReader.readValue(ObjectReader.java:1492)
	at com.provys.serverapi.restapi.obj.api.NoArgumentConstructorTest.testNoArgumentConstructorXml(NoArgumentConstructorTest.java:30)

[cowtowncoder]

Jackson does not consider any of alternate Record constructor but only the primary one.
This does not vary by mapper I think? It would be good to test it for JSON since if this is the case, it'd need improvement there.

I think it would be nice to also auto-detect 0-args constructor FWTW, above is just stating that this does not exist yet.

[cowtowncoder]

Actually fix for #547 (alas, only for 2.15) might help here, essentially resolve. And if not (Record vs POJO) should be relatively easy to solve.

Just need to figure out best way to test, wrt combination of things; XML module only requiring JDK 8 for build but Records available only in 15+

[cowtowncoder]

I added a test in https://github.com/FasterXML/jackson-jdk17-compat-test to verify that this is indeed fixed; will mark as such.