@JsonAnySetter does not deserialize null to Deserializer's NullValue

[ejsolberg]

Issue became apparent when using an @JsonAnySetter with the Immutables Library. The underlying implementation uses a guava ImmutableMap which throws an exception when a null entry is added.

I'm using the following interface method declaration for the anySetter. The expectation is that null values would be deserialized as an instance of NullNode instead of null

@JsonAnySetter
Map<String, JsonNode> setUnknownProperties();

I believe the issue is here:
https://github.com/FasterXML/jackson-databind/blob/master/src/main/java/com/fasterxml/jackson/databind/deser/SettableAnyProperty.java#L132-L134

[cowtowncoder]

Thanks! As per my note on PR, all I need is CLA and I'll merge this fix, backporting to 2.7 as well (or if you want, you can change it for branch 2.7).

[ejsolberg]

I've just submitted the CLA. I've opened the PR against 2.6. Are you still accepting changes to this branch? I would ideally like to patch it into all open branches.

Thanks!

[cowtowncoder]

@ejsolberg I did apply it against 2.6 (thank you for doing it there -- that's perfect), although it is uncertain whether new releases will be made -- branch is closed from full releases. But it is possible that micro-patches could be done, so it'd be in 2.6.6.1. Fix will go in 2.7.5 for sure, and of course in 2.8.0 release candidates once we start that process.