Update JacksonAutoConfiguration with nicer defaults

[bclozel]

Should Boot disable by default FAIL_ON_UNKNOWN_PROPERTIES in the ObjectMapper configuration?

Jackson's stock configuration actually fails deserialization whenever it encounters an unknown property. Right now, POJOs need to list all incoming JSON properties (even if it means annotating them with JsonIgnore.

See https://jira.spring.io/browse/SPR-11891 for further reference.

[philwebb]

See also #1227 which is about offering a configuration file option. My vote would be to switch and provide a configuration option so that users can switch back if they wish.

Seems like Jackson won't be changing anytime soon.

[cdupuis]

@philwebb can you elaborate a bit on the configuration file option. Are you talking about a generic conf file that takes any of the SerializationFeature or DeserializationFeature constants as keys?

[philwebb]

@cdupuis I was thinking of a @ConfigurationProperties that exposes some of those options so that they can be configured in application.properties. @wilkinsona has made a start already (see #1227).

[sdeleuze]

As discussed on SPR-12179,
SerializationConfig.Feature.DEFAULT_VIEW_INCLUSION should also be set to false by default, and we may provide such default in Spring Framework MVC config.

I am working on that right now, and will give you an update shortly in order to ensure Spring Framework and Spring Boot play well together.