MismatchedInputException: Cannot deserialize instance of `com.fasterxml.jackson.databind.node.ObjectNode` out of VALUE_NULL token

When using readerForUpdating and updating an existing objectNode to a null Node this exception is triggered

com.fasterxml.jackson.databind.exc.MismatchedInputException: Cannot deserialize instance of `com.fasterxml.jackson.databind.node.ObjectNode` out of VALUE_NULL token
 at [Source: UNKNOWN; line: -1, column: -1]

	at com.fasterxml.jackson.databind.exc.MismatchedInputException.from(MismatchedInputException.java:59)
	at com.fasterxml.jackson.databind.DeserializationContext.reportInputMismatch(DeserializationContext.java:1468)
	at com.fasterxml.jackson.databind.DeserializationContext.handleUnexpectedToken(DeserializationContext.java:1242)
	at com.fasterxml.jackson.databind.DeserializationContext.handleUnexpectedToken(DeserializationContext.java:1148)
	at com.fasterxml.jackson.databind.deser.std.JsonNodeDeserializer$ObjectDeserializer.deserialize(JsonNodeDeserializer.java:107)
	at com.fasterxml.jackson.databind.deser.std.JsonNodeDeserializer$ObjectDeserializer.deserialize(JsonNodeDeserializer.java:82)
	at com.fasterxml.jackson.databind.deser.std.BaseNodeDeserializer.updateObject(JsonNodeDeserializer.java:361)
	at com.fasterxml.jackson.databind.deser.std.BaseNodeDeserializer.updateObject(JsonNodeDeserializer.java:373)
	at com.fasterxml.jackson.databind.deser.std.JsonNodeDeserializer$ObjectDeserializer.deserialize(JsonNodeDeserializer.java:120)
	at com.fasterxml.jackson.databind.deser.std.JsonNodeDeserializer$ObjectDeserializer.deserialize(JsonNodeDeserializer.java:82)
	at com.fasterxml.jackson.databind.ObjectReader._bindAndClose(ObjectReader.java:2081)
	at com.fasterxml.jackson.databind.ObjectReader.readValue(ObjectReader.java:1696)
	at com.fasterxml.jackson.databind.ObjectReader.readValue(ObjectReader.java:1711)

Version information Jackson : 2.11.4 Java : openjdk-15.0.2

To Reproduce

  @Test
  void test() throws IOException {

    ObjectMapper objectMapper = new ObjectMapper();

    ObjectNode node = objectMapper.createObjectNode();
    node.set("test", objectMapper.createObjectNode());

    ObjectNode update = objectMapper.createObjectNode();
    update.set("test", NullNode.getInstance());

    ObjectReader objectReader = objectMapper.readerForUpdating(node);
    ObjectNode afterUpdateNode = objectReader.readValue(update, ObjectNode.class);

  }

Expected behavior In the code above node starts as

{
  "test": {}
}

and updated with the object update containing

{
  "test": null
}

after the update is applied afterUpdateNode should contain the following

{
  "test": null
}

But instead the above exception is raised. This looks to be same as #2325 but that was closed by the originator

[Stexxen]

Sorry please ignore that I’ve just seen the comments in the file I added.

/**
 * Automatically generated from PackageVersion.java.in during
 * packageVersion-generate execution of maven-replacer-plugin in
 * pom.xml.
 */

Doh!.

[cowtowncoder]

Unfortunately I have been unable to make it so that IDE auto-import would auto-generate that file: running mvn compile will create it.