Ability to globally reject strings containing time information for LocalDate

[mjustin]

Is your feature request related to a problem? Please describe.

I recently ran across a bug in code I was working on that was due to the client code passing across a date/time value for a different time zone than the server into a LocalDate property. Due to this, the date portion of the string was a different date than was intended. This would have been prevented had the backend code rejected the date/time value, and only accepted a value in yyyy-MM-dd format. I can configure that for each individual property using @JsonFormat(pattern = "yyyy-MM-dd"), but I would rather be able to configure something like this globally.

Describe the solution you'd like
I would like a feature that could be configured on ObjectMapper that causes a date with temporal information to be rejected when deserializing to a LocalDate. Two ways I could see this being done are by globally specifying the exact format to use (yyyy-MM-dd), or by having some sort of global flag telling Jackson to be strict about date formats that contain extra temporal information.

Here are some related Stack Overflow questions regarding this same situation:

1. https://stackoverflow.com/q/68513802
2. https://stackoverflow.com/q/57367013

[kupci]

"or by having some sort of global flag telling Jackson to be strict about date formats that contain extra temporal information."

I believe this was recently fixed, in 2.13, see Java 8 issue 212:

Currently LocalDateDeserializer automatically accepts non-standard format where time part also exists.
While this is useful for some use cases, compatibility, it seems reasonable that if user forces "strict" handling (via @jsonformat, or global default), that part would not be accepted.

FasterXML/jackson-modules-java8#212

[mjustin]

For those who (like me) had difficulty figuring out how to specify the globally default leniency, the ObjectMapper.setDefaultLeniency() and MapperBuilder.defaultLeniency() methods will do it:

ObjectMapper objectMapper = new ObjectMapper().setDefaultLeniency(false);

or

JsonMapper objectMapper = JsonMapper.builder().defaultLeniency(true).build();